⬆️ Bump github/codeql-action from 4.32.1 to 4.32.3 (#5077)

Bumps [github/codeql-action](https://github.com/github/codeql-action) from 4.32.1 to 4.32.3.
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](6bc82e05fd...9e907b5e64)

---
updated-dependencies:
- dependency-name: github/codeql-action
  dependency-version: 4.32.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.cirrus.yml

@@ -0,0 +1,17 @@
+arm_container:
+  image: gcc:latest
+
+check_task:
+  check_script:
+  - wget https://github.com/Kitware/CMake/releases/download/v3.20.2/cmake-3.20.2.tar.gz
+  - tar xfz cmake-3.20.2.tar.gz
+  - cd cmake-3.20.2
+  - ./configure
+  - make cmake ctest -j4
+  - cd ..
+  - mkdir build
+  - cd build
+  - ../cmake-3.20.2/bin/cmake .. -DJSON_FastTests=ON
+  - make -j4
+  - cd tests
+  - ../../cmake-3.20.2/bin/ctest -j4

.clang-tidy

@@ -0,0 +1,85 @@
+# TODO: The first three checks are only removed to get the CI going. They have to be addressed at some point.
+# TODO: portability-avoid-pragma-once: should be fixed eventually
+
+Checks: '*,
+
+         -portability-template-virtual-member-function,
+         -bugprone-use-after-move,
+         -hicpp-invalid-access-moved,
+
+         -altera-id-dependent-backward-branch,
+         -altera-struct-pack-align,
+         -altera-unroll-loops,
+         -android-cloexec-fopen,
+         -boost-use-ranges,
+         -bugprone-easily-swappable-parameters,
+         -cert-err58-cpp,
+         -clang-analyzer-webkit.NoUncountedMemberChecker,
+         -concurrency-mt-unsafe,
+         -cppcoreguidelines-avoid-const-or-ref-data-members,
+         -cppcoreguidelines-avoid-do-while,
+         -cppcoreguidelines-avoid-goto,
+         -cppcoreguidelines-avoid-magic-numbers,
+         -cppcoreguidelines-avoid-non-const-global-variables,
+         -cppcoreguidelines-macro-usage,
+         -cppcoreguidelines-pro-bounds-avoid-unchecked-container-access,
+         -cppcoreguidelines-pro-bounds-array-to-pointer-decay,
+         -cppcoreguidelines-pro-bounds-constant-array-index,
+         -cppcoreguidelines-pro-bounds-pointer-arithmetic,
+         -cppcoreguidelines-pro-type-reinterpret-cast,
+         -cppcoreguidelines-pro-type-union-access,
+         -cppcoreguidelines-rvalue-reference-param-not-moved,
+         -cppcoreguidelines-virtual-class-destructor,
+         -fuchsia-default-arguments-calls,
+         -fuchsia-default-arguments-declarations,
+         -fuchsia-overloaded-operator,
+         -google-explicit-constructor,
+         -google-readability-function-size,
+         -google-runtime-float,
+         -google-runtime-int,
+         -google-runtime-references,
+         -hicpp-avoid-goto,
+         -hicpp-explicit-conversions,
+         -hicpp-function-size,
+         -hicpp-no-array-decay,
+         -hicpp-no-assembler,
+         -hicpp-signed-bitwise,
+         -hicpp-uppercase-literal-suffix,
+         -llvm-header-guard,
+         -llvm-include-order,
+         -llvm-prefer-static-over-anonymous-namespace,
+         -llvm-use-ranges,
+         -llvmlibc-*,
+         -misc-use-anonymous-namespace,
+         -misc-confusable-identifiers,
+         -misc-include-cleaner,
+         -misc-no-recursion,
+         -misc-non-private-member-variables-in-classes,
+         -modernize-concat-nested-namespaces,
+         -modernize-type-traits,
+         -modernize-use-constraints,
+         -modernize-use-designated-initializers,
+         -modernize-use-nodiscard,
+         -modernize-use-ranges,
+         -modernize-use-std-numbers,
+         -modernize-use-trailing-return-type,
+         -performance-enum-size,
+         -portability-avoid-pragma-once,
+         -readability-function-cognitive-complexity,
+         -readability-function-size,
+         -readability-identifier-length,
+         -readability-magic-numbers,
+         -readability-redundant-access-specifiers,
+         -readability-redundant-parentheses,
+         -readability-simplify-boolean-expr,
+         -readability-uppercase-literal-suffix,
+         -readability-use-concise-preprocessor-directives'
+
+CheckOptions:
+  - key: hicpp-special-member-functions.AllowSoleDefaultDtor
+    value: 1
+
+WarningsAsErrors: '*'
+
+#HeaderFilterRegex: '.*nlohmann.*'
+HeaderFilterRegex: '.*hpp$'

.github/CODEOWNERS

@@ -0,0 +1,6 @@
+# JSON for Modern C++ was originally written by Niels Lohmann.
+# Since 2013, over 250 contributors have helped to improve the library.
+# This CODEOWNERS file is only to make sure that @nlohmann is requested
+# for a code review in case of a pull request.
+
+* @nlohmann

.github/CODE_OF_CONDUCT.md

@@ -0,0 +1,132 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, caste, color, religion, or sexual
+identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the overall
+  community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or advances of
+  any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email address,
+  without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official email address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+[mail@nlohmann.me](mailto:mail@nlohmann.me).
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series of
+actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or permanent
+ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior, harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within the
+community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.1, available at
+[https://www.contributor-covenant.org/version/2/1/code_of_conduct.html][v2.1].
+
+Community Impact Guidelines were inspired by
+[Mozilla's code of conduct enforcement ladder][Mozilla CoC].
+
+For answers to common questions about this code of conduct, see the FAQ at
+[https://www.contributor-covenant.org/faq][FAQ]. Translations are available at
+[https://www.contributor-covenant.org/translations][translations].
+
+[homepage]: https://www.contributor-covenant.org
+[v2.1]: https://www.contributor-covenant.org/version/2/1/code_of_conduct.html
+[Mozilla CoC]: https://github.com/mozilla/diversity
+[FAQ]: https://www.contributor-covenant.org/faq
+[translations]: https://www.contributor-covenant.org/translations

.github/CONTRIBUTING.md

@@ -1,75 +1,225 @@
-[![Issue Stats](http://issuestats.com/github/nlohmann/json/badge/pr?style=flat)](http://issuestats.com/github/nlohmann/json) [![Issue Stats](http://issuestats.com/github/nlohmann/json/badge/issue?style=flat)](http://issuestats.com/github/nlohmann/json)
+# Contribution Guidelines
 
-# How to contribute
+Thank you for your interest in contributing to this project! What began as an exercise to explore the exciting features
+of C++11 has evolved into a [widely used](https://json.nlohmann.me/home/customers/) JSON library. I truly appreciate all
+the contributions from the community, whether it's proposing features, identifying bugs, or fixing mistakes! To ensure
+that our collaboration is efficient and effective, please follow these guidelines.
 
-This project started as a little excuse to exercise some of the cool new C++11 features. Over time, people actually started to use the JSON library (yey!) and started to help improve it by proposing features, finding bugs, or even fixing my mistakes. I am really [thankful](https://github.com/nlohmann/json/blob/master/README.md#thanks) for this and try to keep track of all the helpers.
+Feel free to discuss or suggest improvements to this document
+[by submitting a pull request](https://github.com/nlohmann/json/edit/develop/.github/CONTRIBUTING.md).
 
-To make it as easy as possible for you to contribute and for me to keep an overview, here are a few guidelines which should help us avoid all kinds of unnecessary work or disappointment. And of course, this document is subject to discussion, so please [create an issue](https://github.com/nlohmann/json/issues/new) or a pull request if you find a way to improve it!
+## Ways to Contribute
 
-## Prerequisites
+There are multiple ways to contribute.
 
-Please [create an issue](https://github.com/nlohmann/json/issues/new), assuming one does not already exist, and describe your concern. Note you need a [GitHub account](https://github.com/signup/free) for this.
+### Reporting an issue
 
-If you want propose changes to the code, you need to download the [`re2c`](http://re2c.org) tool.
-
-## Describe your issue
+Please [create an issue](https://github.com/nlohmann/json/issues/new/choose), assuming one does not already exist, and
+describe your concern. Note you need a [GitHub account](https://github.com/signup/free) for this.
 
 Clearly describe the issue:
 
-- If it is a bug, please describe how to **reproduce** it. If possible, attach a complete example which demonstrates the error. Please also state what you **expected** to happen instead of the error.
-- If you propose a change or addition, try to give an **example** how the improved code could look like or how to use it.
-- If you found a compilation error, please tell us which **compiler** (version and operating system) you used and paste the (relevant part of) the error messages to the ticket.
+- If it is a bug, please describe how to **reproduce** it. If possible, attach a _complete example_ which demonstrates
+  the error. Please also state what you **expected** to happen instead of the error.
+- If you propose a change or addition, try to give an **example** what the improved code could look like or how to use
+  it.
+- If you found a compilation error, please tell us which **compiler** (version and operating system) you used and paste
+  the (relevant part of) the error messages to the ticket.
 
-## Files to change
+Please stick to the provided issue template
+[bug report](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE/bug.yaml) if possible.
 
-There are currently two files which need to be edited:
+### Reporting a security vulnerability
 
-1. [`src/json.hpp.re2c`](https://github.com/nlohmann/json/blob/master/src/json.hpp.re2c) (note the `.re2c` suffix) - This file contains a comment section which describes the JSON lexic. This section is translated by [`re2c`](http://re2c.org) into file [`src/json.hpp`](https://github.com/nlohmann/json/blob/master/src/json.hpp) which is plain "vanilla" C++11 code. (In fact, the generated lexer consists of some hundred lines of `goto`s, which is a hint you never want to edit this file...).
+You can report a security vulnerability according to our
+[security policy](https://github.com/nlohmann/json/security/policy).
 
-   If you only edit file `src/json.hpp` (without the `.re2c` suffix), your changes will be overwritten as soon as the lexer is touched again. To generate the `src/json.hpp` file which is actually used during compilation of the tests and all other code, please execute
+### Discussing a new feature
 
-   ```sh
-   make re2c
-   ```
+For questions, feature or support requests, please
+[open a discussion](https://github.com/nlohmann/json/discussions/new). If you find a proposed answer satisfactory,
+please use the "Mark as answer" button to make it easier for readers to see what helped and for the community to filter
+for open questions.
 
-   To run [`re2c`](http://re2c.org) and generate/overwrite file `src/json.hpp` with your changes in file `src/json.hpp.re2c`.
+### Proposing a fix or an improvement
 
+Join an ongoing discussion or comment on an existing issue before starting to code. This can help to avoid duplicate
+efforts or other frustration during the later review.
 
-2. [`test/src/unit.cpp`](https://github.com/nlohmann/json/blob/master/test/unit.cpp) - This contains the [Catch](https://github.com/philsquared/Catch) unit tests which currently cover [100 %](https://coveralls.io/github/nlohmann/json) of the library's code.
+Create a [pull request](https://github.com/nlohmann/json/pulls?q=sort%3Aupdated-desc+is%3Apr+is%3Aopen) against the
+`develop` branch and follow the pull request template. In particular,
 
-   If you add or change a feature, please also add a unit test to this file. The unit tests can be compiled with
+- describe the changes in detail, both the what and why,
+- reference existing issues where applicable,
+- add tests to maintain 100% test coverage,
+- update the documentation as needed, and
+- ensure the source code is amalgamated.
 
-   ```sh
-   make
-   ```
+We describe all points in detail below.
 
-   and can be executed with
+All contributions (including pull requests) must agree to the
+[Developer Certificate of Origin (DCO) version 1.1](https://developercertificate.org). This is exactly the same one
+created and used by the Linux kernel developers and posted on http://developercertificate.org/. This is a developer's
+certification that he or she has the right to submit the patch for inclusion into the project.
 
-   ```sh
-   ./json_unit
-   ```
+## How to...
 
-   The test cases are also executed with several different compilers on [Travis](https://travis-ci.org/nlohmann/json) once you open a pull request.
+### Describe your changes
 
-Please understand that I cannot accept pull requests changing only file `src/json.hpp`.
+This library is primarily maintained as a spare-time project. As such, I cannot make any guarantee how quickly changes
+are merged and released. Therefore, it is very important to make the review as smooth as possible by explaining not only
+_what_ you changed, but _why_. This rationale can be very valuable down the road when improvements or bugs are discussed
+years later.
 
+### Reference an existing issue
 
-## Note
+[Link a pull request to an issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue)
+to clarify that a fix is forthcoming and which issue can be closed after merging. Only a few cases (e.g., fixing typos)
+do not require prior discussions.
 
-- If you open a pull request, the code will be automatically tested with [Valgrind](http://valgrind.org)'s Memcheck tool to detect memory leaks. Please be aware that the execution with Valgrind _may_ in rare cases yield different behavior than running the code directly. This can result in failing unit tests which run successfully without Valgrind.
+### Write tests
 
-## Please don't
+The library has an extensive test suite that currently covers [100 %](https://coveralls.io/github/nlohmann/json) of the
+library's code. These tests are crucial to maintain API stability and give future contributors confidence that they do
+not accidentally break things. As Titus Winters aptly put it:
 
-- Only make changes to file `src/json.hpp` -- please read the paragraph above and understand why `src/json.hpp.re2c` exists.
-- The C++11 support varies between different **compilers** and versions. Please note the [list of supported compilers](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers). Some compilers like GCC 4.8 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with `#ifdef`s or other means.
-- Specifically, I am aware of compilation problems with **Microsoft Visual Studio** (there even is an [issue label](https://github.com/nlohmann/json/issues?utf8=✓&q=label%3A%22visual+studio%22+) for these kind of bugs). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
-- Please refrain from proposing changes that would **break [JSON](http://json.org) conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
-- Please do not open pull requests that address **multiple issues**.
+> If you liked it, you should have put a test on it.
+
+#### Run the tests
+
+First, ensure the test suite runs before making any changes:
+
+```sh
+$ cmake -S. -B build
+$ cmake --build build -j 10
+$ ctest --test-dir build -j 10
+```
+
+The test suite should report:
+
+```
+100% tests passed, 0 tests failed out of 98
+```
+
+#### Add tests
+
+The tests are located in [`tests/src/unit-*.cpp`](https://github.com/nlohmann/json/tree/develop/tests/src) and contain
+[doctest assertions](https://github.com/doctest/doctest/blob/master/doc/markdown/assertions.md) like `CHECK`. The tests
+are structured along the features of the library or the nature of the tests. Usually, it should be clear from the
+context which existing file needs to be extended, and only very few cases require creating new test files.
+
+When fixing a bug, edit `unit-regression2.cpp` and add a section referencing the fixed issue.
+
+#### Exceptions
+
+When you test exceptions, please use `CHECK_THROWS_WITH_AS` which also takes the `what()` argument of the thrown
+exception into account.
+
+#### Coverage
+
+If test coverage decreases, an automatic warning comment will be posted on the pull request. You can access a code
+coverage report as an artifact to the “Ubuntu” workflow.
+
+### Update the documentation
+
+The [main documentation](https://json.nlohmann.me) of the library is generated from the files
+[`docs/mkdocs/docs`](https://github.com/nlohmann/json/blob/develop/docs/mkdocs/docs). This folder contains dedicated
+pages for [certain features](https://github.com/nlohmann/json/tree/develop/docs/mkdocs/docs/features), a list of
+[all exceptions](https://github.com/nlohmann/json/blob/develop/docs/mkdocs/docs/home/exceptions.md), and 
+[extensive API documentation](https://github.com/nlohmann/json/tree/develop/docs/mkdocs/docs/api) with details on every
+public API function.
+
+Build the documentation locally using:
+
+```shell
+make install_venv -C docs/mkdocs
+make serve -C docs/mkdocs
+```
+
+The documentation will then be available at <http://127.0.0.1:8000/>. See the documentation of
+[mkdocs](https://www.mkdocs.org) and [Material for MkDocs](https://squidfunk.github.io/mkdocs-material/) for more
+information.
+
+### Amalgamate the source code
+
+The single-header files
+[`single_include/nlohmann/json.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp) and
+[`single_include/nlohmann/json_fwd.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json_fwd.hpp)
+are **generated** from the source files in the
+[`include/nlohmann` directory](https://github.com/nlohmann/json/tree/develop/include/nlohmann). **Do not** edit the
+files directly; instead, modify the include/nlohmann sources and regenerate the files by executing:
+
+```shell
+make amalgamate
+```
+
+Running `make amalgamate` will also apply automatic formatting to the source files using
+[`Artistic Style`](https://astyle.sourceforge.net/). This formatting may modify your source files in-place. Be certain to review and commit any changes to avoid unintended formatting diffs in commits.
+
+## Recommended documentation
+
+- The library’s [README file](https://github.com/nlohmann/json/blob/master/README.md) is an excellent starting point to
+  understand its functionality.
+- The [documentation page](https://json.nlohmann.me) is the reference documentation of the library.
+- [RFC 8259](https://datatracker.ietf.org/doc/html/rfc8259) is the reference for the JavaScript Object Notation (JSON)
+  Data Interchange Format.
+
+## Please don't...
+
+Certain contributions are not helpful.
+
+### Break the public API
+
+We take pride in the library being used by
+[numerous customers across various industries](https://json.nlohmann.me/home/customers/). They all rely on the
+guarantees provided by [semantic versioning](https://semver.org). Please do not change the library such that the public
+API of the 3.x.y version is broken. This includes:
+
+- Changing function signatures (altering parameter types, return types, number of parameters) or changing the const-ness
+  of member functions.
+- Removing functions.
+- Renaming functions or classes.
+- Changing exception handling.
+- Changing exception ids.
+- Changing access specifiers.
+- Changing default arguments.
+
+Although these guidelines may seem restrictive, they are essential for maintaining the library’s utility.
+
+Breaking changes may be introduced when they are guarded with a feature macro such as
+[`JSON_USE_IMPLICIT_CONVERSIONS`](https://json.nlohmann.me/api/macros/json_use_implicit_conversions/) which allows 
+selectively changing the behavior of the library. In next steps, the current behavior can then be deprecated. Using
+feature macros then allows users to test their code against the library in the next major release.
+
+### Break C++11 language conformance
+
+This library is designed to work with C++11 and later. This means that any
+[supported C++11 compiler](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers) should compile
+the library without problems. Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual
+Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support.
+
+Please do not add features that do not work with the mentioned supported compilers. Please guard features from C++14 and
+later against the respective [`JSON_HAS_CPP_14`](https://json.nlohmann.me/api/macros/json_has_cpp_11/) macros.
+
+### Break JSON conformance
+
+Please refrain from proposing changes that would **break [JSON](https://datatracker.ietf.org/doc/html/rfc8259)
+conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this
+extension.
 
 ## Wanted
 
-The following areas really need contribution:
+The following areas really need contribution and are always welcomed:
 
-- Extending the **continuous integration** toward more exotic compilers such as Android NDK, Intel's Compiler, or the bleeding-edge versions of GCC or Clang.
-- Improving the efficiency of the **JSON parser**. The current parser is implemented as a naive recursive descent parser with hand coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep the parser inside the `json.hpp` header, and I am not aware of approaches similar to [`re2c`](http://re2c.org) for parsing.
-- Extending and updating existing **benchmarks** to include (the most recent version of) this library. Though efficiency is not everything, speed and memory consumption are very important characteristics for C++ developers, so having proper comparisons would be interesting.
+- Extending the **continuous integration** toward more exotic compilers such as Android NDK, Intel's Compiler, or the
+  bleeding-edge versions Clang.
+- Improving the efficiency of the **JSON parser**. The current parser is implemented as a naive recursive descent parser
+  with hand-coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That
+  said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep
+  the parser inside the `json.hpp` header, and I am not aware of approaches similar to [`re2c`](http://re2c.org) for
+  parsing.
+- Extending and updating existing **benchmarks** to include (the most recent version of) this library. Though efficiency
+  is not everything, speed and memory consumption are very important characteristics for C++ developers, so having
+  proper comparisons would be interesting.
+
+We look forward to your contributions and collaboration to enhance the library!

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+github: nlohmann
+custom: https://paypal.me/nlohmann

.github/ISSUE_TEMPLATE/bug.yaml

@@ -0,0 +1,95 @@
+name: Bug Report
+description: Create a bug report
+labels:
+  - 'kind: bug'
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Thanks for taking the time to fill out this bug report!
+        
+        Make sure you give it a short and specific **title** so that the report
+        is searchable and uniquely identifiable.
+        
+        Note that this form is for bug reports only. Please
+        [open a discussion](https://github.com/nlohmann/json/discussions/new)
+        for questions, feature requests, or support requests.
+        **Please check the [FAQ](https://json.nlohmann.me/home/faq/) before
+        reporting an issue.** Common questions are answered there.        
+  - type: textarea
+    id: summary
+    attributes:
+      label: Description
+      description: >
+        Please provide an abstract description of the issue to the developers,
+        and why you consider it to be a bug. Please include any specific links
+        to the documentation, JSON specification, or code.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Reproduction steps
+      description: >
+        How do you trigger the bug? Please walk us through step by step. Be as
+        specific as possible.
+    validations:
+      required: true
+  - type: textarea
+    id: results
+    attributes:
+      label: Expected vs. actual results
+      description: >
+        Please describe what you expected to happen after the steps above and
+        what actually happened.
+    validations:
+      required: true
+  - type: textarea
+    id: code
+    attributes:
+      label: Minimal code example
+      description: >
+        If possible, provide a small and self-contained example that triggers
+        the bug. Please understand that we cannot analyze and debug large code
+        bases. Please do not paste screenshots here.
+      render: Shell
+  - type: textarea
+    id: output
+    attributes:
+      label: Error messages
+      description: >
+        Please provide any kind of error output (compilation errors, exception
+        messages, stack traces, etc.) which can help to diagnose the error.
+      render: Shell
+  - type: input
+    id: compiler
+    attributes:
+      label: Compiler and operating system
+      description: >
+        On which operating systems and compilers have you observed the issue?
+        Include as many relevant details about the environment you experienced
+        the bug in. Make sure you use a
+        [supported compiler](https://github.com/nlohmann/json#supported-compilers).
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Library version
+      description: >
+        Which version of the library did you use? If it is a released version,
+        please enter the version number (e.g., 3.12.0). Otherwise, please enter
+        the commit hash. If you got the library from another source as the
+        GitHub repository (e.g., via a package manager), please also state
+        this.
+    validations:
+      required: true
+  - type: checkboxes
+    id: validation
+    attributes:
+      label: Validation
+      description: >
+        Please check these additional steps:
+      options:
+        - label: The bug also occurs if the latest version from the [`develop`](https://github.com/nlohmann/json/tree/develop) branch is used.
+        - label: I can successfully [compile and run the unit tests](https://github.com/nlohmann/json#execute-unit-tests).

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question
+    url: https://github.com/nlohmann/json/discussions
+    about: Ask questions and discuss with other community members

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,46 +1,9 @@
+[Describe your pull request here. Please read the text below the line and make sure you follow the checklist.]
 
-## Files to change
+- [ ] The changes are described in detail, both the what and why.
+- [ ] If applicable, an [existing issue](https://github.com/nlohmann/json/issues) is referenced.
+- [ ] The [Code coverage](https://coveralls.io/github/nlohmann/json) remained at 100%. A test case for every new line of code.
+- [ ] If applicable, the [documentation](https://json.nlohmann.me) is updated.
+- [ ] The source code is amalgamated by running `make amalgamate`.
 
-There are currently two files which need to be edited:
-
-1. [`src/json.hpp.re2c`](https://github.com/nlohmann/json/blob/master/src/json.hpp.re2c) (note the `.re2c` suffix) - This file contains a comment section which describes the JSON lexic. This section is translated by [`re2c`](http://re2c.org) into file [`src/json.hpp`](https://github.com/nlohmann/json/blob/master/src/json.hpp) which is plain "vanilla" C++11 code. (In fact, the generated lexer consists of some hundred lines of `goto`s, which is a hint you never want to edit this file...).
-
-   If you only edit file `src/json.hpp` (without the `.re2c` suffix), your changes will be overwritten as soon as the lexer is touched again. To generate the `src/json.hpp` file which is actually used during compilation of the tests and all other code, please execute
-
-   ```sh
-   make re2c
-   ```
-
-   To run [`re2c`](http://re2c.org) and generate/overwrite file `src/json.hpp` with your changes in file `src/json.hpp.re2c`.
-
-
-2. [`test/src/unit.cpp`](https://github.com/nlohmann/json/blob/master/test/unit.cpp) - This contains the [Catch](https://github.com/philsquared/Catch) unit tests which currently cover [100 %](https://coveralls.io/github/nlohmann/json) of the library's code.
-
-   If you add or change a feature, please also add a unit test to this file. The unit tests can be compiled with
-
-   ```sh
-   make
-   ```
-
-   and can be executed with
-
-   ```sh
-   ./json_unit
-   ```
-
-   The test cases are also executed with several different compilers on [Travis](https://travis-ci.org/nlohmann/json) once you open a pull request.
-
-Please understand that I cannot accept pull requests changing only file `src/json.hpp`.
-
-
-## Note
-
-- If you open a pull request, the code will be automatically tested with [Valgrind](http://valgrind.org)'s Memcheck tool to detect memory leaks. Please be aware that the execution with Valgrind _may_ in rare cases yield different behavior than running the code directly. This can result in failing unit tests which run successfully without Valgrind.
-
-## Please don't
-
-- Only make changes to file `src/json.hpp` -- please read the paragraph above and understand why `src/json.hpp.re2c` exists.
-- The C++11 support varies between different **compilers** and versions. Please note the [list of supported compilers](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers). Some compilers like GCC 4.8 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with `#ifdef`s or other means.
-- Specifically, I am aware of compilation problems with **Microsoft Visual Studio** (there even is an [issue label](https://github.com/nlohmann/json/issues?utf8=✓&q=label%3A%22visual+studio%22+) for these kind of bugs). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
-- Please refrain from proposing changes that would **break [JSON](http://json.org) conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
-- Please do not open pull requests that address **multiple issues**.
+Read the [Contribution Guidelines](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md) for detailed information.

.github/SECURITY.md

@@ -0,0 +1,25 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+We value the security of our users and appreciate your efforts to responsibly disclose vulnerabilities. If you have
+identified a security vulnerability in this repository, please use the GitHub Security Advisory
+["Report a Vulnerability"](https://github.com/nlohmann/json/security/advisories/new) tab.
+
+Until it is published, this draft security advisory will only be visible to the maintainers of this project. Other
+users and teams may be added once the advisory is created.
+
+We will send a response indicating the next steps in handling your report. After the initial reply to your report, we
+will keep you informed of the progress towards a fix and full announcement and may ask for additional information or
+guidance.
+
+For vulnerabilities in third-party dependencies or modules, please report them directly to the respective maintainers.
+
+## Additional Resources
+
+- Explore security-related topics and contribute to tools and projects through
+  [GitHub Security Lab](https://securitylab.github.com/).
+- Learn more about responsible disclosure and reporting vulnerabilities in GitHub at
+  [About coordinated disclosure of security vulnerabilities](https://docs.github.com/en/code-security/repository-security-advisories/about-coordinated-disclosure-of-security-vulnerabilities).
+
+We sincerely thank you for contributing to the security and integrity of this project!

.github/config.yml

@@ -0,0 +1,22 @@
+# Configuration for sentiment-bot - https://github.com/behaviorbot/sentiment-bot
+
+# *Required* toxicity threshold between 0 and .99 with the higher numbers being the most toxic
+# Anything higher than this threshold will be marked as toxic and commented on
+sentimentBotToxicityThreshold: .7
+
+# *Required* Comment to reply with
+sentimentBotReplyComment: >
+  Please be sure to review the [code of conduct](https://github.com/nlohmann/json/blob/develop/.github/CODE_OF_CONDUCT.md) and be respectful of other users. cc/ @nlohmann
+
+
+# Configuration for request-info - https://github.com/behaviorbot/request-info
+
+# *Required* Comment to reply with
+requestInfoReplyComment: >
+  We would appreciate it if you could provide us with more info about this issue or pull request! Please check the [issue template](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE.md) and the [pull request template](https://github.com/nlohmann/json/blob/develop/.github/PULL_REQUEST_TEMPLATE.md).
+
+# *OPTIONAL* Label to be added to Issues and Pull Requests with insufficient information given
+requestInfoLabelToAdd: "state: needs more info"
+
+checkIssueTemplate: true
+checkPullRequestTemplate: true

.github/dependabot.yml

@@ -0,0 +1,31 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /docs/mkdocs
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /tools/astyle
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /tools/generate_natvis
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /tools/serve_header
+    schedule:
+      interval: daily
+
+  - package-ecosystem: pip
+    directory: /cmake/requirements
+    schedule:
+      interval: daily

.github/external_ci/appveyor.yml

@@ -0,0 +1,91 @@
+version: '{build}'
+
+# only build PRs and commits to develop branch
+# (see https://help.appveyor.com/discussions/questions/55079-two-builds-per-commit-to-pull-request)
+branches:
+  only:
+    - develop
+
+only_commits:
+  files:
+    - .github/external_ci/appveyor.yml
+    - cmake/
+    - include/
+    - tests/
+    - CMakeLists.txt
+
+environment:
+  matrix:
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      configuration: Debug
+      platform: x86
+      CXX_FLAGS: "/W4 /WX"
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      configuration: Release
+      platform: x86
+      CXX_FLAGS: "/W4 /WX"
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      configuration: Release
+      platform: x86
+      name: with_win_header
+      CXX_FLAGS: "/W4 /WX"
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      configuration: Release
+      platform: x86
+      CXX_FLAGS: "/permissive- /std:c++17 /utf-8 /W4 /WX"
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 15 2017
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      configuration: Release
+      platform: x86
+      CXX_FLAGS: "/W4 /WX"
+      CMAKE_OPTIONS: "-DJSON_ImplicitConversions=OFF"
+      GENERATOR: Visual Studio 16 2019
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      configuration: Release
+      platform: x64
+      CXX_FLAGS: "/W4 /WX"
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      configuration: Release
+      platform: x64
+      CXX_FLAGS: "/permissive- /std:c++17 /Zc:__cplusplus /utf-8 /W4 /WX"
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 15 2017
+
+init:
+  - cmake --version
+  - msbuild /version
+
+install:
+  - if "%platform%"=="x86"    set GENERATOR_PLATFORM=Win32
+
+before_build:
+  # for with_win_header build, inject the inclusion of Windows.h to the single-header library
+  - ps: if ($env:name -Eq "with_win_header") { $header_path = "single_include\nlohmann\json.hpp" }
+  - ps: if ($env:name -Eq "with_win_header") { "#include <Windows.h>`n" + (Get-Content $header_path | Out-String) | Set-Content $header_path }
+  - cmake . -G "%GENERATOR%" -A "%GENERATOR_PLATFORM%" -DCMAKE_CXX_FLAGS="%CXX_FLAGS%" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin" -DJSON_BuildTests=On "%CMAKE_OPTIONS%"
+
+build_script:
+  - cmake --build . --config "%configuration%" --parallel 2
+
+test_script:
+  - if "%configuration%"=="Release" ctest -C "%configuration%" --parallel 2 --output-on-failure
+  # On Debug builds, skip test-unicode_all
+  # as it is extremely slow to run and cause
+  # occasional timeouts on AppVeyor.
+  # More info: https://github.com/nlohmann/json/pull/1570
+  - if "%configuration%"=="Debug" ctest --exclude-regex "test-unicode" -C "%configuration%" --parallel 2 --output-on-failure

.github/labeler.yml

@@ -0,0 +1,38 @@
+version: 1
+
+labels:
+- label: "documentation"
+  files:
+    - "README.md"
+
+- label: "documentation"
+  files:
+    - "docs/.*"
+
+- label: "tests"
+  files:
+    - "tests/.*"
+
+- label: "CMake"
+  files:
+    - ".*CMakeLists.txt"
+
+- label: "CMake"
+  files:
+    - "cmake/.*"
+
+- label: "CI"
+  files:
+    - "github/workflows/.*"
+
+- label: "CI"
+  files:
+    - "github/external_ci/.*"
+
+- label: "S"
+  size-below: 10
+- label: "M"
+  size-above: 9
+  size-below: 100
+- label: "L"
+  size-above: 100

.github/workflows/check_amalgamation.yml

@@ -0,0 +1,76 @@
+name: "Check amalgamation"
+
+on:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  save:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Save PR number
+        run: |
+          mkdir -p ./pr
+          echo ${{ github.event.number }} > ./pr/number
+          echo ${{ github.event.pull_request.user.login }} > ./pr/author
+      - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: pr
+          path: pr/
+
+  check:
+    runs-on: ubuntu-latest
+    env:
+      MAIN_DIR: ${{ github.workspace }}/main
+      INCLUDE_DIR: ${{ github.workspace }}/main/single_include/nlohmann
+      TOOL_DIR: ${{ github.workspace }}/tools/tools/amalgamate
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Checkout pull request
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          path: main
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Checkout tools
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          path: tools
+          ref: develop
+
+      - name: Install astyle
+        run: |
+          python3 -mvenv venv
+          venv/bin/pip3 install -r $MAIN_DIR/tools/astyle/requirements.txt
+
+      - name: Check amalgamation
+        run: |
+          cd $MAIN_DIR
+
+          rm -fr $INCLUDE_DIR/json.hpp~ $INCLUDE_DIR/json_fwd.hpp~
+          cp $INCLUDE_DIR/json.hpp $INCLUDE_DIR/json.hpp~
+          cp $INCLUDE_DIR/json_fwd.hpp $INCLUDE_DIR/json_fwd.hpp~
+
+          python3 $TOOL_DIR/amalgamate.py -c $TOOL_DIR/config_json.json -s .
+          python3 $TOOL_DIR/amalgamate.py -c $TOOL_DIR/config_json_fwd.json -s .
+          echo "Format (1)"
+          ${{ github.workspace }}/venv/bin/astyle --project=tools/astyle/.astylerc --suffix=none --quiet $INCLUDE_DIR/json.hpp $INCLUDE_DIR/json_fwd.hpp
+
+          diff $INCLUDE_DIR/json.hpp~ $INCLUDE_DIR/json.hpp
+          diff $INCLUDE_DIR/json_fwd.hpp~ $INCLUDE_DIR/json_fwd.hpp
+
+          ${{ github.workspace }}/venv/bin/astyle --project=tools/astyle/.astylerc --suffix=orig $(find docs/examples include tests -type f \( -name '*.hpp' -o -name '*.cpp' -o -name '*.cu' \) -not -path 'tests/thirdparty/*' -not -path 'tests/abi/include/nlohmann/*' | sort)
+          echo Check
+          find $MAIN_DIR -name '*.orig' -exec false {} \+

.github/workflows/cifuzz.yml

@@ -0,0 +1,35 @@
+name: CIFuzz
+on: [pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  Fuzzing:
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+      with:
+        egress-policy: audit
+
+    - name: Build Fuzzers
+      id: build
+      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
+      with:
+        oss-fuzz-project-name: 'json'
+        dry-run: false
+        language: c++
+    - name: Run Fuzzers
+      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
+      with:
+        oss-fuzz-project-name: 'json'
+        fuzz-seconds: 300
+        dry-run: false
+        language: c++
+    - name: Upload Crash
+      uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+      if: failure() && steps.build.outcome == 'success'
+      with:
+        name: artifacts
+        path: ./out/artifacts

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,49 @@
+name: "Code scanning - action"
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - release/*
+  pull_request:
+  schedule:
+    - cron: '0 19 * * 1'
+  workflow_dispatch:
+  
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  CodeQL-Build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+
+    steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+      with:
+        egress-policy: audit
+
+    - name: Checkout repository
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@9e907b5e64f6b83e7804b09294d44122997950d6 # v4.32.3
+      with:
+        languages: c-cpp
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@9e907b5e64f6b83e7804b09294d44122997950d6 # v4.32.3
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@9e907b5e64f6b83e7804b09294d44122997950d6 # v4.32.3

.github/workflows/comment_check_amalgamation.yml

@@ -0,0 +1,81 @@
+name: Comment Check Amalgamation
+on:
+  workflow_run:
+    workflows: ["Check amalgamation"]
+    types:
+      - completed
+
+permissions:
+  contents: read
+
+jobs:
+  comment:
+    if: ${{ github.event.workflow_run.conclusion == 'failure' }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      actions: read
+      issues: read
+      pull-requests: write
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: 'Download artifact'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            var artifacts = await github.rest.actions.listWorkflowRunArtifacts({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               run_id: ${{github.event.workflow_run.id }},
+            });
+            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
+              return artifact.name == "pr"
+            })[0];
+            var download = await github.rest.actions.downloadArtifact({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               artifact_id: matchArtifact.id,
+               archive_format: 'zip',
+            });
+            var fs = require('fs');
+            fs.writeFileSync('${{github.workspace}}/pr.zip', Buffer.from(download.data));
+      - run: unzip pr.zip
+
+      - name: 'Comment on PR'
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            var fs = require('fs');
+            const author = fs.readFileSync('./author')
+            const issue_number = Number(fs.readFileSync('./number'));
+            const opts = github.rest.issues.listForRepo.endpoint.merge({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              creator: author,
+              state: 'all'
+            })
+            let first = true
+            const issues = await github.paginate(opts)
+            for (const issue of issues) {
+              if (issue.number === issue_number) {
+                continue
+              }
+              if (issue.pull_request) {
+                first = false
+                break
+              }
+            }
+            await github.rest.issues.createComment({
+              issue_number: issue_number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: '## 🔴 Amalgamation check failed! 🔴\nThe source code has not been amalgamated.'
+                    + (first ? ' @' + author + ' Please read and follow the [Contribution Guidelines]'
+                               + '(https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#files-to-change).'
+                             : '')
+              })

.github/workflows/dependency-review.yml

@@ -0,0 +1,27 @@
+# Dependency Review Action
+#
+# This Action will scan dependency manifest files that change as part of a Pull Request,
+# surfacing known-vulnerable versions of the packages declared or updated in the PR.
+# Once installed, if the workflow run is marked as required,
+# PRs introducing known-vulnerable packages will be blocked from merging.
+#
+# Source repository: https://github.com/actions/dependency-review-action
+name: 'Dependency Review'
+on: [pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  dependency-review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: 'Checkout Repository'
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: 'Dependency Review'
+        uses: actions/dependency-review-action@3c4e3dcb1aa7874d2c16be7d79418e9b7efd6261 # v4.8.2

.github/workflows/flawfinder.yml

@@ -0,0 +1,46 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: flawfinder
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches: [ "develop" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "develop" ]
+  schedule:
+    - cron: '41 14 * * 3'
+
+jobs:
+  flawfinder:
+    name: Flawfinder
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: flawfinder_scan
+        uses: david-a-wheeler/flawfinder@c57197cd6061453f10a496f30a732bc1905918d1 # v2.0.19
+        with:
+          arguments: '--sarif ./'
+          output: 'flawfinder_results.sarif'
+
+      - name: Upload analysis results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@9e907b5e64f6b83e7804b09294d44122997950d6 # v4
+        with:
+          sarif_file: ${{github.workspace}}/flawfinder_results.sarif

.github/workflows/labeler.yml

@@ -0,0 +1,26 @@
+name: "Pull Request Labeler"
+
+on:
+  pull_request_target:
+    types: [opened, synchronize]
+
+permissions:
+  contents: read
+
+jobs:
+  label:
+    permissions:
+      contents: read
+      pull-requests: write
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: srvaroa/labeler@471cdb892ebac76de6cb869105a2017fa3b9b9b3 # master
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/macos.yml

@@ -0,0 +1,121 @@
+name: macOS
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - release/*
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+# macos-11 is deprecated
+#  macos-11:
+#    runs-on: macos-11
+#    strategy:
+#      matrix:
+#        xcode: ['11.7', '12.4', '12.5.1', '13.0']
+#    env:
+#      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+#
+#    steps:
+#      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+#      - name: Run CMake
+#        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+#      - name: Build
+#        run: cmake --build build --parallel 10
+#      - name: Test
+#        run: cd build ; ctest -j 10 --output-on-failure
+
+# macos-12 is deprecated (https://github.com/actions/runner-images/issues/10721)
+#  macos-12:
+#    runs-on: macos-12 # https://github.com/actions/runner-images/blob/main/images/macos/macos-12-Readme.md
+#    strategy:
+#      matrix:
+#        xcode: ['13.1', '13.2.1', '13.3.1', '13.4.1', '14.0', '14.0.1', '14.1']
+#    env:
+#      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+#
+#    steps:
+#      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+#      - name: Run CMake
+#        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+#      - name: Build
+#        run: cmake --build build --parallel 10
+#      - name: Test
+#        run: cd build ; ctest -j 10 --output-on-failure
+
+# macos-13 is deprecated (https://github.com/actions/runner-images/issues/13046)
+#  macos-13:
+#    runs-on: macos-13 # https://github.com/actions/runner-images/blob/main/images/macos/macos-13-Readme.md
+#    strategy:
+#      matrix:
+#        xcode: ['14.1', '14.2', '14.3', '14.3.1', '15.0.1', '15.1', '15.2']
+#    env:
+#      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+#
+#    steps:
+#      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+#      - name: Run CMake
+#        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+#      - name: Build
+#        run: cmake --build build --parallel 10
+#      - name: Test
+#        run: cd build ; ctest -j 10 --output-on-failure
+
+  macos-14:
+    runs-on: macos-14 # https://github.com/actions/runner-images/blob/main/images/macos/macos-14-Readme.md
+    strategy:
+      matrix:
+        xcode: ['15.0.1', '15.1', '15.2', '15.3', '15.4']
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+      - name: Build
+        run: cmake --build build --parallel 10
+      - name: Test
+        run: cd build ; ctest -j 10 --output-on-failure
+
+  macos-15:
+    runs-on: macos-15 # https://github.com/actions/runner-images/blob/main/images/macos/macos-15-Readme.md
+    strategy:
+      matrix:
+        xcode: ['16.0', '16.1', '16.2', '16.3', '16.4', '26.0.1']
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+      - name: Build
+        run: cmake --build build --parallel 10
+      - name: Test
+        run: cd build ; ctest -j 10 --output-on-failure
+
+  xcode_standards:
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        standard: [11, 14, 17, 20, 23, 26]
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_TestStandards=${{ matrix.standard }}
+      - name: Build
+        run: cmake --build build --parallel 10
+      - name: Test
+        run: cd build ; ctest -j 10 --output-on-failure

.github/workflows/publish_documentation.yml

@@ -0,0 +1,46 @@
+name: Publish documentation
+
+# publish the documentation on every merge to develop branch
+on:
+  push:
+    branches:
+      - develop
+    paths:
+      - docs/mkdocs/**
+      - docs/examples/**
+  workflow_dispatch:
+
+# we don't want to have concurrent jobs, and we don't want to cancel running jobs to avoid broken publications
+concurrency:
+  group: documentation
+  cancel-in-progress: false
+
+permissions:
+  contents: read
+
+jobs:
+  publish_documentation:
+    permissions:
+      contents: write
+
+    if: github.repository == 'nlohmann/json'
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Install virtual environment
+        run: make install_venv -C docs/mkdocs
+
+      - name: Build documentation
+        run: make build -C docs/mkdocs
+
+      - name: Deploy documentation
+        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./docs/mkdocs/site

.github/workflows/scorecards.yml

@@ -0,0 +1,81 @@
+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '20 7 * * 2'
+  push:
+    branches: ["develop"]
+
+permissions:
+  contents: read
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+      contents: read
+      actions: read
+      # To allow GraphQL ListCommits to work
+      issues: read
+      pull-requests: read
+      # To detect SAST tools
+      checks: read
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: "Checkout code"
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@4eaacf0543bb3f2c246792bd56e8cdeffafb205a # v2.4.3
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
+          # - you want to enable the Branch-Protection check on a *public* repository, or
+          # - you are installing Scorecards on a *private* repository
+          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action#authentication-with-pat.
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+
+          # Public repositories:
+          #   - Publish results to OpenSSF REST API for easy access by consumers
+          #   - Allows the repository to include the Scorecard badge.
+          #   - See https://github.com/ossf/scorecard-action#publishing-results.
+          # For private repositories:
+          #   - `publish_results` will always be set to `false`, regardless
+          #     of the value entered here.
+          publish_results: true
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard.
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@9e907b5e64f6b83e7804b09294d44122997950d6 # v4.32.3
+        with:
+          sarif_file: results.sarif

.github/workflows/semgrep.yml

@@ -0,0 +1,54 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+# This workflow file requires a free account on Semgrep.dev to
+# manage rules, file ignores, notifications, and more.
+#
+# See https://semgrep.dev/docs
+
+name: Semgrep
+
+on:
+  push:
+    branches: [ "develop" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "develop" ]
+  schedule:
+    - cron: '23 2 * * 4'
+
+permissions:
+  contents: read
+
+jobs:
+  semgrep:
+    permissions:
+      contents: read # for actions/checkout to fetch code
+      security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
+      actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
+    name: Scan
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      # Checkout project source
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      # Scan code using project's configuration on https://semgrep.dev/manage
+      - uses: returntocorp/semgrep-action@713efdd345f3035192eaa63f56867b88e63e4e5d
+        with:
+          publishToken: ${{ secrets.SEMGREP_APP_TOKEN }}
+          publishDeployment: ${{ secrets.SEMGREP_DEPLOYMENT_ID }}
+          generateSarif: "1"
+
+      # Upload SARIF file generated in previous step
+      - name: Upload SARIF file
+        uses: github/codeql-action/upload-sarif@9e907b5e64f6b83e7804b09294d44122997950d6 # v4
+        with:
+          sarif_file: semgrep.sarif
+        if: always()

.github/workflows/stale.yml

@@ -0,0 +1,34 @@
+name: 'Comment and close stale issues and PR'
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+permissions:
+  contents: read
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+
+    permissions:
+      issues: write
+      pull-requests: write
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/stale@997185467fa4f803885201cee163a9f38240193d # v10.1.1
+        with:
+          stale-issue-label: 'state: stale'
+          stale-pr-label: 'state: stale'
+          exempt-issue-labels: 'pinned,security'
+          stale-issue-message: 'This issue has been marked as stale because it has been open for 90 days without activity. If this issue is still relevant, please add a comment or remove the "stale" label. Otherwise, it will be closed in 10 days. Thank you for helping us prioritize our work!'
+          stale-pr-message: 'This pull request has been marked as stale because it has had no activity for 30 days. While we won’t close it automatically, we encourage you to update or comment if it is still relevant. Keeping pull requests active and up-to-date helps us review and merge changes more efficiently. Thank you for your contributions!'
+          close-issue-message: 'This issue has been closed after being marked as stale for 10 days without any further activity. If this was done in error or the issue is still relevant, please feel free to reopen it or create a new issue. We appreciate your understanding and contributions.'
+          days-before-stale: 90
+          days-before-pr-stale: 30
+          days-before-close: 10
+          days-before-pr-close: -1

.github/workflows/ubuntu.yml

@@ -0,0 +1,283 @@
+name: Ubuntu
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - release/*
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  ci_test_gcc:
+    runs-on: ubuntu-latest
+    container: gcc:latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_test_gcc
+
+  ci_infer:
+    runs-on: ubuntu-latest
+    container: ghcr.io/nlohmann/json-ci:v2.4.0
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_infer
+
+  ci_static_analysis_ubuntu:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [ci_test_amalgamation, ci_test_single_header, ci_cppcheck, ci_cpplint, ci_reproducible_tests, ci_non_git_tests, ci_offline_testdata, ci_reuse_compliance, ci_test_valgrind]
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Install Valgrind
+        run: sudo apt-get update ; sudo apt-get install -y valgrind
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ${{ matrix.target }}
+
+  ci_static_analysis_clang:
+    runs-on: ubuntu-latest
+    container: silkeh/clang:dev
+    strategy:
+      matrix:
+        target: [ci_test_clang, ci_clang_tidy, ci_test_clang_sanitizer, ci_clang_analyze, ci_single_binaries]
+    steps:
+      - name: Install git, clang-tools, iwyu (ci_single_binaries), and unzip
+        run: apt-get update ; apt-get install -y git clang-tools iwyu unzip
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ${{ matrix.target }}
+
+  ci_cmake_options:
+    runs-on: ubuntu-latest
+    container: ubuntu:focal
+    strategy:
+      matrix:
+        target: [ci_cmake_flags, ci_test_diagnostics, ci_test_diagnostic_positions, ci_test_noexceptions, ci_test_noimplicitconversions, ci_test_legacycomparison, ci_test_noglobaludls]
+    steps:
+      - name: Install build-essential
+        run: apt-get update ; apt-get install -y build-essential unzip wget git libssl-dev
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ${{ matrix.target }}
+
+  ci_test_coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Install dependencies and de_DE locale
+        run: |
+          sudo apt-get clean
+          sudo apt-get update
+          sudo apt-get install -y build-essential cmake lcov ninja-build make locales gcc-multilib g++-multilib
+          sudo locale-gen de_DE
+          sudo update-locale
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_test_coverage
+      - name: Archive coverage report
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: code-coverage-report
+          path: ${{ github.workspace }}/build/html
+      - name: Publish report to Coveralls
+        uses: coverallsapp/github-action@5cbfd81b66ca5d10c19b062c04de0199c215fb6e # v2.3.7
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: ${{ github.workspace }}/build/json.info.filtered.noexcept
+          fail-on-error: false
+
+  ci_test_compilers_gcc_old:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: ['4.8', '4.9', '5', '6']
+    container: ghcr.io/nlohmann/json-ci:v2.4.0
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: CXX=g++-${{ matrix.compiler }} cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_test_compiler_g++-${{ matrix.compiler }}
+
+  ci_test_compilers_gcc:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # older GCC docker images (4, 5, 6) fail to check out code
+        compiler: ['7', '8', '9', '10', '11', '12', '13', '14', '15', 'latest']
+    container: gcc:${{ matrix.compiler }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_test_compiler_default
+
+  ci_test_compilers_clang:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: ['3.4', '3.5', '3.6', '3.7', '3.8', '3.9', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15-bullseye', '16', '17', '18', '19', '20', 'latest']
+    container: silkeh/clang:${{ matrix.compiler }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Set env FORCE_STDCPPFS_FLAG for clang 7 / 8 / 9 / 10
+        run: echo "JSON_FORCED_GLOBAL_COMPILE_OPTIONS=-DJSON_HAS_FILESYSTEM=0;-DJSON_HAS_EXPERIMENTAL_FILESYSTEM=0" >> "$GITHUB_ENV"
+        if: ${{ matrix.compiler == '7' || matrix.compiler == '8' || matrix.compiler == '9' || matrix.compiler == '10' }}
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_test_compiler_default
+
+  ci_test_standards_gcc:
+    runs-on: ubuntu-latest
+    container: gcc:latest
+    strategy:
+      matrix:
+        standard: [11, 14, 17, 20, 23, 26]
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_test_gcc_cxx${{ matrix.standard }}
+
+  ci_test_standards_clang:
+    runs-on: ubuntu-latest
+    container: silkeh/clang:latest
+    strategy:
+      matrix:
+        standard: [11, 14, 17, 20, 23, 26]
+        stdlib: [libcxx, libstdcxx]
+    steps:
+      - name: Install git and unzip
+        run: apt-get update ; apt-get install -y git unzip
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build with libc++
+        run: cmake --build build --target ci_test_clang_libcxx_cxx${{ matrix.standard }}
+        if: ${{ matrix.stdlib == 'libcxx' }}
+      - name: Build with libstdc++
+        run: cmake --build build --target ci_test_clang_cxx${{ matrix.standard }}
+        if: ${{ matrix.stdlib == 'libstdcxx' }}
+
+  ci_cuda_example:
+    runs-on: ubuntu-latest
+    container: ghcr.io/nlohmann/json-ci:v2.4.0
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_cuda_example
+
+  ci_module_cpp20:
+    strategy:
+      matrix:
+        container: ['gcc:latest', 'silkeh/clang:latest']
+    runs-on: ubuntu-latest
+    container: ${{ matrix.container }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ci_module_cpp20
+
+  ci_icpc:
+    runs-on: ubuntu-latest
+    container: ghcr.io/nlohmann/json-ci:v2.2.0
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: |
+          . /opt/intel/oneapi/setvars.sh
+          cmake --build build --target ci_icpc
+
+  ci_emscripten:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Install emscripten
+        uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021 # v14
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Get latest CMake and ninja
+        uses: lukka/get-cmake@dc05ee1ee5ba69770230c73a6a4e947595745cab # v4.2.2
+      - name: Run CMake
+        run: cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -GNinja
+      - name: Build
+        run: cmake --build build
+
+  ci_test_documentation:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [ci_test_examples, ci_test_build_documentation]
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: Build
+        run: cmake --build build --target ${{ matrix.target }}

.github/workflows/windows.yml

@@ -0,0 +1,124 @@
+name: Windows
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - release/*
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  mingw:
+    runs-on: windows-2022
+    strategy:
+      matrix:
+        architecture: [x64, x86]
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Set up MinGW
+        uses: egor-tensin/setup-mingw@41b837e47d7f85214629d255b9c4bc3fcbe9fd63 # v3.0
+        with:
+          platform: ${{ matrix.architecture }}
+          version: 12.2.0 # https://github.com/egor-tensin/setup-mingw/issues/14
+      - name: Run CMake
+        run: cmake -S . -B build -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
+      - name: Build
+        run: cmake --build build --parallel 10
+      - name: Test
+        run: cd build ; ctest -j 10 -C Debug --output-on-failure
+
+  msvc:
+    strategy:
+      matrix:
+        build_type: [Debug, Release]
+        architecture: [Win32, x64]
+        std_version: [default, latest]
+
+    runs-on: windows-2022
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Set extra CXX_FLAGS for latest std_version
+        id: cxxflags
+        run: |
+          if [ "${{ matrix.std_version }}" = "latest" ]; then
+            echo "flags=/permissive- /std:c++latest /utf-8 /W4 /WX" >> $GITHUB_ENV
+          else
+            echo "flags=/W4 /WX" >> $GITHUB_ENV
+          fi
+        shell: bash
+      - name: Run CMake (Release)
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="$env:flags"
+        if: matrix.build_type == 'Release'
+        shell: pwsh
+      - name: Run CMake (Debug)
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_CXX_FLAGS="$env:flags"
+        if: matrix.build_type == 'Debug'
+        shell: pwsh
+      - name: Build
+        run: cmake --build build --config ${{ matrix.build_type }} --parallel 10
+      - name: Test
+        run: cd build ; ctest -j 10 -C ${{ matrix.build_type }} --output-on-failure
+
+  clang:
+    runs-on: windows-2022
+    strategy:
+      matrix:
+        version: [11.0.1, 12.0.1, 13.0.1, 14.0.6, 15.0.7, 16.0.6, 18.1.8, 19.1.7, 20.1.8]
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Install Clang
+        run: curl -fsSL -o LLVM${{ matrix.version }}.exe https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ matrix.version }}/LLVM-${{ matrix.version }}-win64.exe ; 7z x LLVM${{ matrix.version }}.exe -y -o"C:/Program Files/LLVM"
+      - name: Set up MinGW
+        uses: egor-tensin/setup-mingw@41b837e47d7f85214629d255b9c4bc3fcbe9fd63 # v3.0
+        with:
+          platform: x64
+          version: 12.2.0 # https://github.com/egor-tensin/setup-mingw/issues/14
+      - name: Run CMake
+        run: cmake -S . -B build ^
+             -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" ^
+             -DCMAKE_CXX_FLAGS="--target=x86_64-w64-mingw32 -stdlib=libstdc++ -pthread" ^
+             -DCMAKE_EXE_LINKER_FLAGS="-lwinpthread" ^
+             -G"MinGW Makefiles" ^
+             -DCMAKE_BUILD_TYPE=Debug ^
+             -DJSON_BuildTests=On
+      - name: Build
+        run: cmake --build build --parallel 10
+      - name: Test
+        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
+
+  clang-cl-12:
+    runs-on: windows-2022
+    strategy:
+      matrix:
+        architecture: [Win32, x64]
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -A ${{ matrix.architecture }} -T ClangCL -DJSON_BuildTests=On
+      - name: Build
+        run: cmake --build build --config Debug --parallel 10
+      - name: Test
+        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
+
+  ci_module_cpp20:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run CMake (Debug)
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -DJSON_CI=ON -DCMAKE_CXX_FLAGS="/permissive- /std:c++latest /utf-8 /W4 /WX"
+      - name: Build
+        run: cmake --build build --config Debug --target ci_module_cpp20
+        

.gitignore

@@ -1,16 +1,47 @@
-json_unit
-json_benchmarks
-
-fuzz-testing
-
 *.dSYM
+*.o
+*.gcno
+*.gcda
+.DS_Store
 
-working
+/.idea
+/cmake-build-*
 
-html
-me.nlohmann.json.docset
+# Visual Studio / Visual Studio Code
+/.vs/
+/.vscode/
+/out/
 
-android
-doc/xml
+# clangd cache
+/.cache/
 
-benchmarks/files/numbers/*.json
+# build directories (vscode-cmake-tools, user-defined, ...)
+/build*/
+
+# fuzzers
+/tests/corpus_*
+/tests/parse_*_fuzzer
+
+# documentation
+/docs/docset/JSON_for_Modern_C++.docset/
+/docs/docset/JSON_for_Modern_C++.tgz
+/docs/docset/docSet.dsidx
+/docs/mkdocs/.cache/
+/docs/mkdocs/docs/__pycache__/
+/docs/mkdocs/site/
+/docs/mkdocs/venv/
+
+# serve_header
+/localhost.pem
+/localhost-key.pem
+/serve_header.yml
+
+# Swift Package Manager build directory
+/.build
+
+venv
+
+nlohmann_json.spdx
+
+# Bazel-related
+MODULE.bazel.lock

.reuse/dep5

@@ -0,0 +1,36 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: json
+Upstream-Contact: Niels Lohmann <mail@nlohmann.me>
+Source: https://github.com/nlohmann/json
+
+Files: *
+Copyright: 2013-2026 Niels Lohmann <https://nlohmann.me>
+License: MIT
+
+Files: include/nlohmann/thirdparty/hedley.hpp
+Copyright: 2016-2021 Evan Nemerson <evan@nemerson.com>
+License: CC0
+
+Files: tests/thirdparty/doctest/*
+Copyright: 2016-2023 Viktor Kirilov
+License: MIT
+
+Files: tests/thirdparty/fifo_map/*
+Copyright: 2015-2017 Niels Lohmann
+License: MIT
+
+Files: tests/thirdparty/Fuzzer/*
+Copyright: 2003-2022 LLVM Project.
+License: Apache-2.0
+
+Files: tests/thirdparty/imapdl/*
+Copyright: 2017 Georg Sauthoff <mail@gms.tf>
+License: GPL-3.0-only
+
+Files: tools/amalgamate/*
+Copyright: 2012 Erik Edlund <erik.edlund@32767.se>
+License: BSD-3-Clause
+
+Files: tools/gdb_pretty_printer/*
+Copyright: 2020 Hannes Domani <https://github.com/ssbssa>
+License: MIT

.reuse/templates/json.jinja2

@@ -0,0 +1,11 @@
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++
+|  |  |__   |  |  | | | |  version 3.12.0
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+{% for copyright_line in copyright_lines %}
+{{ copyright_line }}
+{% endfor %}
+{% for expression in spdx_expressions %}
+SPDX-License-Identifier: {{ expression }}
+{% endfor %}

.reuse/templates/json_support.jinja2

@@ -0,0 +1,11 @@
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
+|  |  |__   |  |  | | | |  version 3.12.0
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+{% for copyright_line in copyright_lines %}
+{{ copyright_line }}
+{% endfor %}
+{% for expression in spdx_expressions %}
+SPDX-License-Identifier: {{ expression }}
+{% endfor %}

.travis.yml

@@ -1,176 +0,0 @@
-language: cpp
-
-dist: trusty
-sudo: required
-
-env:
-  global:
-   # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
-   #   via the "travis encrypt" command using the project repo's public key
-   - secure: "m89SSgE+ASLO38rSKx7MTXK3n5NkP9bIx95jwY71YEiuFzib30PDJ/DifKnXxBjvy/AkCGztErQRk/8ZCvq+4HXozU2knEGnL/RUitvlwbhzfh2D4lmS3BvWBGS3N3NewoPBrRmdcvnT0xjOGXxtZaJ3P74TkB9GBnlz/HmKORA="
-
-# from http://stackoverflow.com/a/32127147/266378
-matrix:
-  include:
-    - os: linux
-      compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-4.9', 'valgrind', 'python-pip', 'python-yaml']
-      before_script:
-        - pip install --user git+git://github.com/eddyxu/cpp-coveralls.git
-      after_success:
-        - make clean
-        - touch src/json.hpp
-        - make json_unit CXXFLAGS="-fprofile-arcs -ftest-coverage -std=c++11 -lstdc++" CXX=$COMPILER
-        - ./json_unit "*"
-        - coveralls --exclude test/src/catch.hpp --exclude test/src/unit.cpp --include src/json.hpp --gcov-options '\-lp' --gcov 'gcov-4.9'
-        - bash <(curl -s https://codecov.io/bash)
-      env: COMPILER=g++-4.9
-
-    - os: linux
-      compiler: gcc
-      before_install: echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-certificates.crt
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-5', 'valgrind']
-        coverity_scan:
-          project:
-            name: "nlohmann/json"
-            description: "Build submitted via Travis CI"
-          notification_email: niels.lohmann@gmail.com
-          build_command_prepend: "make clean ; sudo cp $(which g++-5) $(which g++)"
-          build_command: "make"
-          branch_pattern: coverity_scan
-      env: COMPILER=g++-5
-
-    - os: linux
-      compiler: gcc
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: ['g++-6', 'valgrind']
-      env: COMPILER=g++-6
-
-    # from https://github.com/travis-ci/travis-ci/issues/6120
-    - os: linux
-      env:
-        - LLVM_VERSION=3.8.0
-        - LLVM_ARCHIVE_PATH=$HOME/clang+llvm.tar.xz
-        - COMPILER=clang++
-        - CPPFLAGS="-I $HOME/clang-$LLVM_VERSION/include/c++/v1"
-        - CXXFLAGS=-lc++
-        - PATH=$HOME/clang-$LLVM_VERSION/bin:$PATH
-        - LD_LIBRARY_PATH=$HOME/clang-$LLVM_VERSION/lib:$LD_LIBRARY_PATH
-      before_install:
-       - wget http://llvm.org/releases/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-14.04.tar.xz -O $LLVM_ARCHIVE_PATH
-       - mkdir $HOME/clang-$LLVM_VERSION
-       - tar xf $LLVM_ARCHIVE_PATH -C $HOME/clang-$LLVM_VERSION --strip-components 1
-
-    # Clang 3.5 is not able to compile the code,
-    # see https://travis-ci.org/nlohmann/json/jobs/126720186
-
-#    - os: linux
-#      compiler: clang
-#      addons:
-#        apt:
-#          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
-#          packages: ['clang-3.6', 'valgrind']
-#      env: COMPILER=clang++-3.6
-#
-#    - os: linux
-#      compiler: clang
-#      addons:
-#        apt:
-#          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.7']
-#          packages: ['clang-3.7', 'valgrind']
-#      env: COMPILER=clang++-3.7
-#
-#    - os: linux
-#      compiler: clang
-#      addons:
-#        apt:
-#          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.8']
-#          packages: ['clang-3.8', 'valgrind']
-#      env: COMPILER=clang++-3.8
-
-  #  - os: linux
-  #    compiler: clang
-  #    addons:
-  #      apt:
-  #        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise']
-  #        packages: ['clang-3.9', 'valgrind']
-  #    env: COMPILER=clang++-3.9
-
-    - os: osx
-      osx_image: beta-xcode6.1
-      compiler: clang
-      env:
-       - COMPILER=clang
-       - CXXFLAGS=-lstdc++
-
-    - os: osx
-      osx_image: beta-xcode6.2
-      compiler: clang
-      env:
-       - COMPILER=clang
-       - CXXFLAGS=-lstdc++
-
-    - os: osx
-      osx_image: beta-xcode6.3
-      compiler: clang
-      env:
-       - COMPILER=clang
-       - CXXFLAGS=-lstdc++
-
-    - os: osx
-      osx_image: xcode6.4
-      compiler: clang
-      env:
-       - COMPILER=clang
-       - CXXFLAGS=-lstdc++
-
-    - os: osx
-      osx_image: xcode7.1
-      compiler: clang
-      env:
-       - COMPILER=clang
-       - CXXFLAGS=-lstdc++
-     
-    - os: osx
-      osx_image: xcode7.2
-      compiler: clang
-      env:
-       - COMPILER=clang
-       - CXXFLAGS=-lstdc++
-
-    - os: osx
-      osx_image: xcode7.3
-      compiler: clang
-      env:
-       - COMPILER=clang
-       - CXXFLAGS=-lstdc++
-
-    - os: osx
-      osx_image: xcode8
-      compiler: clang
-      env:
-       - COMPILER=clang
-       - CXXFLAGS=-lstdc++
-
-script:
-  - uname -a
-  - $COMPILER --version
-  - make CXX=$COMPILER
-  - ./json_unit "*"
-  - if [ `which valgrind` ]; then
-    valgrind --error-exitcode=1 --leak-check=full ./json_unit ;
-    fi
-  - if [ `which brew` ]; then
-    brew update ;
-    brew tap nlohmann/json ;
-    brew install nlohmann_json --HEAD ;
-    brew test nlohmann_json ;
-    fi

BUILD.bazel

@@ -0,0 +1,80 @@
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+load("@rules_license//rules:license.bzl", "license")
+
+package(
+    default_applicable_licenses = [":license"],
+)
+
+exports_files([
+    "LICENSE.MIT",
+])
+
+license(
+    name = "license",
+    license_kinds = ["@rules_license//licenses/spdx:MIT"],
+    license_text = "LICENSE.MIT",
+)
+
+cc_library(
+    name = "json",
+    hdrs = [
+        "include/nlohmann/adl_serializer.hpp",
+        "include/nlohmann/byte_container_with_subtype.hpp",
+        "include/nlohmann/detail/abi_macros.hpp",
+        "include/nlohmann/detail/conversions/from_json.hpp",
+        "include/nlohmann/detail/conversions/to_chars.hpp",
+        "include/nlohmann/detail/conversions/to_json.hpp",
+        "include/nlohmann/detail/exceptions.hpp",
+        "include/nlohmann/detail/hash.hpp",
+        "include/nlohmann/detail/input/binary_reader.hpp",
+        "include/nlohmann/detail/input/input_adapters.hpp",
+        "include/nlohmann/detail/input/json_sax.hpp",
+        "include/nlohmann/detail/input/lexer.hpp",
+        "include/nlohmann/detail/input/parser.hpp",
+        "include/nlohmann/detail/input/position_t.hpp",
+        "include/nlohmann/detail/iterators/internal_iterator.hpp",
+        "include/nlohmann/detail/iterators/iter_impl.hpp",
+        "include/nlohmann/detail/iterators/iteration_proxy.hpp",
+        "include/nlohmann/detail/iterators/iterator_traits.hpp",
+        "include/nlohmann/detail/iterators/json_reverse_iterator.hpp",
+        "include/nlohmann/detail/iterators/primitive_iterator.hpp",
+        "include/nlohmann/detail/json_custom_base_class.hpp",
+        "include/nlohmann/detail/json_pointer.hpp",
+        "include/nlohmann/detail/json_ref.hpp",
+        "include/nlohmann/detail/macro_scope.hpp",
+        "include/nlohmann/detail/macro_unscope.hpp",
+        "include/nlohmann/detail/meta/call_std/begin.hpp",
+        "include/nlohmann/detail/meta/call_std/end.hpp",
+        "include/nlohmann/detail/meta/cpp_future.hpp",
+        "include/nlohmann/detail/meta/detected.hpp",
+        "include/nlohmann/detail/meta/identity_tag.hpp",
+        "include/nlohmann/detail/meta/is_sax.hpp",
+        "include/nlohmann/detail/meta/std_fs.hpp",
+        "include/nlohmann/detail/meta/type_traits.hpp",
+        "include/nlohmann/detail/meta/void_t.hpp",
+        "include/nlohmann/detail/output/binary_writer.hpp",
+        "include/nlohmann/detail/output/output_adapters.hpp",
+        "include/nlohmann/detail/output/serializer.hpp",
+        "include/nlohmann/detail/string_concat.hpp",
+        "include/nlohmann/detail/string_escape.hpp",
+        "include/nlohmann/detail/string_utils.hpp",
+        "include/nlohmann/detail/value_t.hpp",
+        "include/nlohmann/json.hpp",
+        "include/nlohmann/json_fwd.hpp",
+        "include/nlohmann/ordered_map.hpp",
+        "include/nlohmann/thirdparty/hedley/hedley.hpp",
+        "include/nlohmann/thirdparty/hedley/hedley_undef.hpp",
+    ],
+    includes = ["include"],
+    visibility = ["//visibility:public"],
+    alwayslink = True,
+)
+
+cc_library(
+    name = "singleheader-json",
+    hdrs = [
+        "single_include/nlohmann/json.hpp",
+    ],
+    includes = ["single_include"],
+    visibility = ["//visibility:public"],
+)

CITATION.cff

@@ -0,0 +1,14 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - family-names: Lohmann
+    given-names: Niels
+    orcid: https://orcid.org/0000-0001-9037-795X
+    email: mail@nlohmann.me
+    website: https://nlohmann.me
+title: "JSON for Modern C++"
+version: 3.12.0
+date-released: 2025-04-07
+license: MIT
+repository-code: "https://github.com/nlohmann"
+url: https://json.nlohmann.me

CMakeLists.txt

@@ -1,54 +1,237 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5...4.0)
 
-# define the project
-project(nlohmann_json VERSION 2.0.2 LANGUAGES CXX)
+##
+## PROJECT
+## name and version
+##
+project(nlohmann_json VERSION 3.12.0 LANGUAGES CXX)
 
-enable_testing()
-
-option(BuildTests "Build the unit tests" ON)
-
-# define project variables
-set(JSON_TARGET_NAME ${PROJECT_NAME})
-set(JSON_PACKAGE_NAME ${JSON_TARGET_NAME})
-set(JSON_TARGETS_FILENAME "${JSON_PACKAGE_NAME}Targets.cmake")
-set(JSON_CONFIG_FILENAME "${JSON_PACKAGE_NAME}Config.cmake")
-set(JSON_CONFIGVERSION_FILENAME "${JSON_PACKAGE_NAME}ConfigVersion.cmake")
-set(JSON_CONFIG_DESTINATION "cmake")
-set(JSON_INCLUDE_DESTINATION "include/nlohmann")
-
-# create and configure the library target
-add_library(${JSON_TARGET_NAME} INTERFACE)
-target_include_directories(${JSON_TARGET_NAME} INTERFACE
-  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
-  $<INSTALL_INTERFACE:${JSON_INCLUDE_DESTINATION}>)
-
-# create and configure the unit test target
-if (BuildTests)
-    add_subdirectory(test)
+##
+## MAIN_PROJECT CHECK
+## determine if nlohmann_json is built as a subproject (using add_subdirectory) or if it is the main project
+##
+set(MAIN_PROJECT OFF)
+if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+    set(MAIN_PROJECT ON)
 endif()
 
-# generate a config and config version file for the package
+##
+## INCLUDE
+##
+##
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
+include(ExternalProject)
+
+# ---- C++ Modules Support (optional) ----
+option(NLOHMANN_JSON_BUILD_MODULES "Build C++ modules support" OFF)
+
+if(NLOHMANN_JSON_BUILD_MODULES)
+    if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.28)
+        message(STATUS "Building nlohmann.json C++ module")
+        add_subdirectory(src/modules)
+    else()
+        message(WARNING "Skipping nlohmann.json C++ module (requires CMake 3.28+, found ${CMAKE_VERSION})")
+    endif()
+endif()
+
+##
+## OPTIONS
+##
+
+if (POLICY CMP0077)
+    # Allow CMake 3.13+ to override options when using FetchContent / add_subdirectory.
+    cmake_policy(SET CMP0077 NEW)
+endif ()
+
+# VERSION_GREATER_EQUAL is not available in CMake 3.1
+if(${MAIN_PROJECT} AND (${CMAKE_VERSION} VERSION_EQUAL 3.13 OR ${CMAKE_VERSION} VERSION_GREATER 3.13))
+    set(JSON_BuildTests_INIT ON)
+else()
+    set(JSON_BuildTests_INIT OFF)
+endif()
+option(JSON_BuildTests                     "Build the unit tests when BUILD_TESTING is enabled." ${JSON_BuildTests_INIT})
+option(JSON_CI                             "Enable CI build targets." OFF)
+option(JSON_Diagnostics                    "Use extended diagnostic messages." OFF)
+option(JSON_Diagnostic_Positions           "Enable diagnostic positions." OFF)
+option(JSON_GlobalUDLs                     "Place user-defined string literals in the global namespace." ON)
+option(JSON_ImplicitConversions            "Enable implicit conversions." ON)
+option(JSON_DisableEnumSerialization       "Disable default integer enum serialization." OFF)
+option(JSON_LegacyDiscardedValueComparison "Enable legacy discarded value comparison." OFF)
+option(JSON_Install                        "Install CMake targets during install step." ${MAIN_PROJECT})
+option(JSON_MultipleHeaders                "Use non-amalgamated version of the library." ON)
+option(JSON_SystemInclude                  "Include as system headers (skip for clang-tidy)." OFF)
+
+if (JSON_CI)
+    include(ci)
+endif ()
+
+##
+## CONFIGURATION
+##
+include(GNUInstallDirs)
+
+if (NOT DEFINED NLOHMANN_JSON_TARGET_NAME)
+    # Allow overriding the target name when using FetchContent / add_subdirectory.
+    set(NLOHMANN_JSON_TARGET_NAME ${PROJECT_NAME})
+endif()
+
+set(NLOHMANN_JSON_CONFIG_INSTALL_DIR        "${CMAKE_INSTALL_DATADIR}/cmake/${PROJECT_NAME}" CACHE INTERNAL "")
+set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR       "${CMAKE_INSTALL_INCLUDEDIR}")
+set(NLOHMANN_JSON_TARGETS_EXPORT_NAME       "${PROJECT_NAME}Targets")
+set(NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE     "cmake/config.cmake.in")
+set(NLOHMANN_JSON_CMAKE_CONFIG_DIR          "${CMAKE_CURRENT_BINARY_DIR}")
+set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
+set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake")
+set(NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Targets.cmake")
+set(NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR     "${CMAKE_INSTALL_DATADIR}/pkgconfig")
+
+if (JSON_MultipleHeaders)
+    set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/")
+    message(STATUS "Using the multi-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
+else()
+    set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/single_include/")
+    message(STATUS "Using the single-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
+endif()
+
+if (NOT JSON_ImplicitConversions)
+    message(STATUS "Implicit conversions are disabled (JSON_USE_IMPLICIT_CONVERSIONS=0)")
+endif()
+
+if (JSON_DisableEnumSerialization)
+    message(STATUS "Enum integer serialization is disabled (JSON_DISABLE_ENUM_SERIALIZATION=0)")
+endif()
+
+if (JSON_LegacyDiscardedValueComparison)
+    message(STATUS "Legacy discarded value comparison enabled (JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON=1)")
+endif()
+
+if (JSON_Diagnostics)
+    message(STATUS "Diagnostics enabled (JSON_DIAGNOSTICS=1)")
+endif()
+
+if (JSON_Diagnostic_Positions)
+    message(STATUS "Diagnostic positions enabled (JSON_DIAGNOSTIC_POSITIONS=1)")
+endif()
+
+if (NOT JSON_GlobalUDLs)
+    message(STATUS "User-defined string literals are not put in the global namespace (JSON_USE_GLOBAL_UDLS=0)")
+endif()
+
+if (JSON_SystemInclude)
+    set(NLOHMANN_JSON_SYSTEM_INCLUDE "SYSTEM")
+endif()
+
+##
+## TARGET
+## create target and add include path
+##
+add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
+add_library(${PROJECT_NAME}::${NLOHMANN_JSON_TARGET_NAME} ALIAS ${NLOHMANN_JSON_TARGET_NAME})
+if (${CMAKE_VERSION} VERSION_LESS "3.8.0")
+    target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_range_for)
+else()
+    target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_std_11)
+endif()
+
+target_compile_definitions(
+    ${NLOHMANN_JSON_TARGET_NAME}
+    INTERFACE
+    $<$<NOT:$<BOOL:${JSON_GlobalUDLs}>>:JSON_USE_GLOBAL_UDLS=0>
+    $<$<NOT:$<BOOL:${JSON_ImplicitConversions}>>:JSON_USE_IMPLICIT_CONVERSIONS=0>
+    $<$<BOOL:${JSON_DisableEnumSerialization}>:JSON_DISABLE_ENUM_SERIALIZATION=1>
+    $<$<BOOL:${JSON_Diagnostics}>:JSON_DIAGNOSTICS=1>
+    $<$<BOOL:${JSON_Diagnostic_Positions}>:JSON_DIAGNOSTIC_POSITIONS=1>
+    $<$<BOOL:${JSON_LegacyDiscardedValueComparison}>:JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON=1>
+)
+
+target_include_directories(
+    ${NLOHMANN_JSON_TARGET_NAME}
+    ${NLOHMANN_JSON_SYSTEM_INCLUDE} INTERFACE
+    $<BUILD_INTERFACE:${NLOHMANN_JSON_INCLUDE_BUILD_DIR}>
+    $<INSTALL_INTERFACE:${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}>
+)
+
+## add debug view definition file for msvc (natvis)
+if (MSVC)
+    set(NLOHMANN_ADD_NATVIS TRUE)
+    set(NLOHMANN_NATVIS_FILE "nlohmann_json.natvis")
+    target_sources(
+        ${NLOHMANN_JSON_TARGET_NAME}
+        INTERFACE
+            $<INSTALL_INTERFACE:${NLOHMANN_NATVIS_FILE}>
+            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${NLOHMANN_NATVIS_FILE}>
+    )
+endif()
+
+# Install a pkg-config file, so other tools can find this.
+CONFIGURE_FILE(
+    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/pkg-config.pc.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
+    @ONLY
+)
+
+##
+## TESTS
+## create and configure the unit test target
+##
+if (JSON_BuildTests)
+    include(CTest)
+    enable_testing()
+    add_subdirectory(tests)
+endif()
+
+##
+## INSTALL
+## install header files, generate and install cmake config files for find_package()
+##
 include(CMakePackageConfigHelpers)
-configure_package_config_file("cmake/config.cmake.in"
-    "${CMAKE_CURRENT_BINARY_DIR}/${JSON_CONFIG_FILENAME}"
-    INSTALL_DESTINATION ${JSON_CONFIG_DESTINATION})
-write_basic_package_version_file("${CMAKE_CURRENT_BINARY_DIR}/${JSON_CONFIGVERSION_FILENAME}"
-    VERSION ${PROJECT_VERSION}
-    COMPATIBILITY SameMajorVersion)
+# use a custom package version config file instead of
+# write_basic_package_version_file to ensure that it's architecture-independent
+# https://github.com/nlohmann/json/issues/1697
+configure_file(
+    "cmake/nlohmann_jsonConfigVersion.cmake.in"
+    ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
+    @ONLY
+)
+configure_file(
+    ${NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE}
+    ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE}
+    @ONLY
+)
 
-# export the library target and store build directory in package registry
-export(TARGETS ${JSON_TARGET_NAME}
-	FILE "${CMAKE_CURRENT_BINARY_DIR}/${JSON_TARGETS_FILENAME}")
-export(PACKAGE ${JSON_PACKAGE_NAME})
-
-# install library target and config files
-install(TARGETS ${JSON_TARGET_NAME}
-	EXPORT ${JSON_PACKAGE_NAME})
-install(FILES "src/json.hpp"
-	DESTINATION ${JSON_INCLUDE_DESTINATION})
-install(EXPORT ${JSON_PACKAGE_NAME}
-	FILE ${JSON_TARGETS_FILENAME}
-	DESTINATION ${JSON_CONFIG_DESTINATION})
-install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${JSON_CONFIG_FILENAME}"
-	"${CMAKE_CURRENT_BINARY_DIR}/${JSON_CONFIGVERSION_FILENAME}"
-	DESTINATION ${JSON_CONFIG_DESTINATION})
+if(JSON_Install)
+    install(
+        DIRECTORY ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}
+        DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
+    )
+    install(
+        FILES ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE} ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
+        DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
+    )
+    if (NLOHMANN_ADD_NATVIS)
+        install(
+            FILES ${NLOHMANN_NATVIS_FILE}
+            DESTINATION .
+    )
+    endif()
+    export(
+        TARGETS ${NLOHMANN_JSON_TARGET_NAME}
+        NAMESPACE ${PROJECT_NAME}::
+        FILE ${NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE}
+    )
+    install(
+        TARGETS ${NLOHMANN_JSON_TARGET_NAME}
+        EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
+        INCLUDES DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
+    )
+    install(
+        EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
+        NAMESPACE ${PROJECT_NAME}::
+        DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
+    )
+    install(
+        FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
+        DESTINATION ${NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR}
+    )
+    include(CPack)
+endif()

FILES.md

@@ -0,0 +1,239 @@
+# Supporting files
+
+This file describes the source for supporting files; that is, files that are not part of the library, but define the infrastructure and other aspects of the project.
+
+- [Continuous Integration](#continuous-integration)
+- [GitHub](#github)
+- [REUSE](#reuse)
+- [Package Managers](#package-managers)
+
+## Continuous Integration
+
+### `.cirrus.yml`
+
+Configuration file for the pipeline at [Cirrus CI](https://cirrus-ci.com/github/nlohmann/json).
+
+Further documentation:
+
+- [Writing tasks](https://cirrus-ci.org/guide/writing-tasks/)
+
+> [!IMPORTANT]
+> The filename `.cirrus.yml` and position (root of the repository) are predetermined by Cirrus CI.
+
+### `.github/external_ci/appveyor.yml`
+
+Configuration for the pipelines at [AppVeyor](https://ci.appveyor.com/project/nlohmann/json).
+
+Further documentation:
+
+- [appveyor.yml reference](https://www.appveyor.com/docs/appveyor-yml/)
+
+> [!NOTE]
+> The filename can be freely configured in the AppVeyor project.
+
+## GitHub
+
+### `CITATION.cff`
+
+A file to configure the citation for the repository which is displayed in the sidebar of the project.
+
+Further documentation:
+
+- [About CITATION files](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-citation-files)
+
+> [!IMPORTANT]
+> The filename `CITATION.cff` and position (root of the repository) are predetermined by GitHub.
+
+### `.github/CODE_OF_CONDUCT.md`
+
+The code of conduct for the project. This is the Markdown version of the [Contributor Covenant Code of Conduct](https://www.contributor-covenant.org/version/2/1/code_of_conduct/). The code of conduct is linked on the [Community Standards](https://github.com/nlohmann/json/community) page and is mentioned by the Sentiment Bot.
+
+Further documentation:
+
+- [Adding a code of conduct to your project](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/adding-a-code-of-conduct-to-your-project)
+
+> [!IMPORTANT]
+> The filename `.github/CODE_OF_CONDUCT.md` is predetermined by GitHub.
+
+> [!NOTE]
+> The file is part of the documentation and is included in `docs/mkdocs/docs/community/code_of_conduct.md`.
+
+### `.github/CODEOWNERS`
+
+The code owners file for the project which is used to select reviewers for new pull requests.
+
+Further documentation:
+
+- [About code owners](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners)
+
+> [!IMPORTANT]
+> The filename `.github/CODEOWNERS` is predetermined by GitHub.
+
+### `.github/config.yml`
+
+Configuration file for [probot](https://probot.github.io/apps/), in particular the [Sentiment Bot](https://probot.github.io/apps/sentiment-bot/) and the [Request Info](https://probot.github.io/apps/request-info/).
+
+> [!IMPORTANT]
+> The filename `.github/config.yml` is predetermined by probot.
+
+### `.github/CONTRIBUTING.md`
+
+The contribution guidelines which are linked in the [Community Standards](https://github.com/nlohmann/json/community) and at <https://github.com/nlohmann/json/contribute>.
+
+Further documentation:
+
+- [Setting guidelines for repository contributors](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/setting-guidelines-for-repository-contributors)
+
+> [!IMPORTANT]
+> The filename `.github/CONTRIBUTING.md` is predetermined by GitHub.
+
+> [!NOTE]
+> The file is part of the documentation and is included in `docs/mkdocs/docs/community/contribution_guidelines.md`.
+
+### `.github/dependabot.yml`
+
+The configuration of [dependabot](https://github.com/dependabot) which ensures the dependencies (GitHub actions and Python packages used in the CI) remain up to date.
+
+Further documentation:
+
+- [Configuring Dependabot security updates](https://docs.github.com/en/code-security/dependabot/dependabot-security-updates/configuring-dependabot-security-updates)
+
+> [!IMPORTANT]
+> The filename `.github/dependabot.yml` is predetermined by GitHub.
+
+### `.github/FUNDING.yml`
+
+A file to configure the sponsor button of the repository which is displayed in the sidebar of the project.
+
+Further documentation:
+
+- [Displaying a sponsor button in your repository](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/displaying-a-sponsor-button-in-your-repository)
+
+> [!IMPORTANT]
+> The filename `.github/FUNDING.yml` is predetermined by GitHub.
+
+### `.github/ISSUE_TEMPLATE/bug.yaml`
+
+Issue form template for bugs.
+
+Further documentation:
+
+- [Configuring issue templates for your repository](https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository)
+
+> [!IMPORTANT]
+> The folder `.github/ISSUE_TEMPLATE` is predetermined by GitHub.
+
+### `.github/ISSUE_TEMPLATE/config.yaml`
+
+Issue template chooser configuration. The file is used to configure the dialog when a new issue is created.
+
+Further documentation:
+
+- [Configuring issue templates for your repository](https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository)
+
+> [!IMPORTANT]
+> The filename `.github/ISSUE_TEMPLATE/config.yaml` is predetermined by GitHub.
+
+### `.github/labeler.yml`
+
+Configuration file for the "Pull Request Labeler" workflow defined in `workflows/labeler.yml`. This file defines rules how labels are assigned to pull requests based on which files are changed.
+
+Further documentation:
+
+- [Label manager for PRs and issues based on configurable conditions](https://github.com/srvaroa/labeler)
+
+> [!NOTE]
+> The filename defaults to `.github/labeler.yml` and can be configured in the workflow.
+
+### `.github/PULL_REQUEST_TEMPLATE.md`
+
+The pull request template which prefills new pull requests.
+
+Further documentation:
+
+- [Creating a pull request template for your repository](https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/creating-a-pull-request-template-for-your-repository)
+
+> [!IMPORTANT]
+> The filename `.github/PULL_REQUEST_TEMPLATE.md` is predetermined by GitHub.
+
+### `.github/SECURITY.md`
+
+The goal is to describe how to securely report security vulnerabilities for this repository. The security policy is linked at <https://github.com/nlohmann/json/security/policy>.
+
+Further documentation:
+
+- [Adding a security policy to your repository](https://docs.github.com/en/code-security/getting-started/adding-a-security-policy-to-your-repository)
+
+> [!IMPORTANT]
+> The filename `.github/SECURITY.yml` is predetermined by GitHub.
+
+> [!NOTE]
+> The file is part of the documentation and is included in `docs/mkdocs/docs/community/security_policy.md`.
+
+### `LICENSE.MIT`
+
+The license of the project.
+
+Further documentation:
+
+- [Adding a license to a repository](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/adding-a-license-to-a-repository)
+
+> [!IMPORTANT]
+> The filename `LICENSE.MIT` is partly predetermined by GitHub. The root filename must be `LICENSE`.
+
+## REUSE
+
+### `.reuse/dep5`
+
+The file defines the licenses of certain third-party components in the repository. The root `Makefile` contains a target `reuse` that checks for compliance.
+
+Further documentation:
+
+- [DEP5](https://reuse.software/spec-3.2/#dep5-deprecated)
+- [reuse command-line tool](https://pypi.org/project/reuse/)
+- [documentation of linting](https://reuse.readthedocs.io/en/stable/man/reuse-lint.html)
+- [REUSE](http://reuse.software)
+
+> [!IMPORTANT]
+> The filename `.reuse/dep5` is predetermined by REUSE. Alternatively, a `REUSE.toml` file can be used.
+
+### `.reuse/templates`
+
+Copyright header templates for source files. The root `Makefile` contains a target `reuse` that updates copyright headers with the templates.
+
+Further information:
+
+- [reuse command-line tool](https://pypi.org/project/reuse/)
+- [documentation on templates](https://reuse.readthedocs.io/en/stable/man/reuse-annotate.html#cmdoption-t)
+- [REUSE](http://reuse.software)
+
+> [!IMPORTANT]
+> The folder name `.reuse/templates` is predetermined by REUSE.
+
+### `LICENSES`
+
+A folder that contains every license of all license files (library and third-party code).
+
+Further documentation:
+
+- [REUSE specification](https://reuse.software/spec-3.3/)
+
+> [!IMPORTANT]
+> The folder name `LICENSES` is predetermined by REUSE.
+
+
+## Package Managers
+
+### `BUILD.bazel`
+
+The file can be updated by calling
+
+```shell
+make BUILD.bazel
+```
+
+### `meson.build`
+
+### `Package.swift`
+
+### `WORKSPACE.bazel`

LICENSE.MIT

@@ -1,14 +1,13 @@
-The library is licensed under the MIT License 
-<http://opensource.org/licenses/MIT>:
+MIT License 
 
-Copyright (c) 2013-2016 Niels Lohmann
+Copyright (c) 2013-2026 Niels Lohmann
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so, subject to the following conditions:
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.

LICENSES/Apache-2.0.txt

@@ -0,0 +1,73 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+"License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.
+
+"Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License.
+
+"Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity.
+
+"You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License.
+
+"Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files.
+
+"Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types.
+
+"Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below).
+
+"Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof.
+
+"Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution."
+
+"Contributor" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form.
+
+3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed.
+
+4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions:
+
+     (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and
+
+     (b) You must cause any modified files to carry prominent notices stating that You changed the files; and
+
+     (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and
+
+     (d) If the Work includes a "NOTICE" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License.
+
+     You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!)  The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives.
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

LICENSES/BSD-3-Clause.txt

@@ -0,0 +1,11 @@
+Copyright (c) <year> <owner>. 
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

LICENSES/CC0-1.0.txt

@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
+    INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
+    REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
+    PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
+    THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
+    HEREUNDER.
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
+exclusive Copyright and Related Rights (defined below) upon the creator
+and subsequent owner(s) (each and all, an "owner") of an original work of
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+Certain owners wish to permanently relinquish those rights to a Work for
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+These owners may contribute to the Commons to promote the ideal of a free
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+
+For these and/or other purposes and motivations, and without any
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+associating CC0 with a Work (the "Affirmer"), to the extent that he or she
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+
+1. Copyright and Related Rights. A Work made available under CC0 may be
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+limited to, the following:
+
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+ vi. database rights (such as those arising under Directive 96/9/EC of the
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+     directive); and
+vii. other similar, equivalent or corresponding rights throughout the
+     world based on applicable law or treaty, and any national
+     implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
+irrevocably and unconditionally waives, abandons, and surrenders all of
+Affirmer's Copyright and Related Rights and associated claims and causes
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+revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
+Waiver shall be preserved to the maximum extent permitted taking into
+account Affirmer's express Statement of Purpose. In addition, to the
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+limitation commercial, advertising or promotional purposes (the
+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
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+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
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+ d. Affirmer understands and acknowledges that Creative Commons is not a
+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.

LICENSES/GPL-3.0-only.txt

@@ -0,0 +1,232 @@
+GNU GENERAL PUBLIC LICENSE
+Version 3, 29 June 2007
+
+Copyright © 2007 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
+
+Preamble
+
+The GNU General Public License is a free, copyleft license for software and other kinds of works.
+
+The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.
+
+When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.
+
+To protect your rights, we need to prevent others from denying you these rights or asking you to surrender the rights. Therefore, you have certain responsibilities if you distribute copies of the software, or if you modify it: responsibilities to respect the freedom of others.
+
+For example, if you distribute copies of such a program, whether gratis or for a fee, you must pass on to the recipients the same freedoms that you received. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights.
+
+Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the software, and (2) offer you this License giving you legal permission to copy, distribute and/or modify it.
+
+For the developers' and authors' protection, the GPL clearly explains that there is no warranty for this free software. For both users' and authors' sake, the GPL requires that modified versions be marked as changed, so that their problems will not be attributed erroneously to authors of previous versions.
+
+Some devices are designed to deny users access to install or run modified versions of the software inside them, although the manufacturer can do so. This is fundamentally incompatible with the aim of protecting users' freedom to change the software. The systematic pattern of such abuse occurs in the area of products for individuals to use, which is precisely where it is most unacceptable. Therefore, we have designed this version of the GPL to prohibit the practice for those products. If such problems arise substantially in other domains, we stand ready to extend this provision to those domains in future versions of the GPL, as needed to protect the freedom of users.
+
+Finally, every program is threatened constantly by software patents. States should not allow patents to restrict development and use of software on general-purpose computers, but in those that do, we wish to avoid the special danger that patents applied to a free program could make it effectively proprietary. To prevent this, the GPL assures that patents cannot be used to render the program non-free.
+
+The precise terms and conditions for copying, distribution and modification follow.
+
+TERMS AND CONDITIONS
+
+0. Definitions.
+
+“This License” refers to version 3 of the GNU General Public License.
+
+“Copyright” also means copyright-like laws that apply to other kinds of works, such as semiconductor masks.
+
+“The Program” refers to any copyrightable work licensed under this License. Each licensee is addressed as “you”. “Licensees” and “recipients” may be individuals or organizations.
+
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+
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+
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+
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+
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+
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+The “source code” for a work means the preferred form of the work for making modifications to it. “Object code” means any non-source form of a work.
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+
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+
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+
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+
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+All rights granted under this License are granted for the term of copyright on the Program, and are irrevocable provided the stated conditions are met. This License explicitly affirms your unlimited permission to run the unmodified Program. The output from running a covered work is covered by this License only if the output, given its content, constitutes a covered work. This License acknowledges your rights of fair use or other equivalent, as provided by copyright law.
+
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+
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+
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+
+4. Conveying Verbatim Copies.
+You may convey verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice; keep intact all notices stating that this License and any non-permissive terms added in accord with section 7 apply to the code; keep intact all notices of the absence of any warranty; and give all recipients a copy of this License along with the Program.
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+
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+
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+     d) If the work has interactive user interfaces, each must display Appropriate Legal Notices; however, if the Program has interactive interfaces that do not display Appropriate Legal Notices, your work need not make them do so.
+
+A compilation of a covered work with other separate and independent works, which are not by their nature extensions of the covered work, and which are not combined with it such as to form a larger program, in or on a volume of a storage or distribution medium, is called an “aggregate” if the compilation and its resulting copyright are not used to limit the access or legal rights of the compilation's users beyond what the individual works permit. Inclusion of a covered work in an aggregate does not cause this License to apply to the other parts of the aggregate.
+
+6. Conveying Non-Source Forms.
+You may convey a covered work in object code form under the terms of sections 4 and 5, provided that you also convey the machine-readable Corresponding Source under the terms of this License, in one of these ways:
+
+     a) Convey the object code in, or embodied in, a physical product (including a physical distribution medium), accompanied by the Corresponding Source fixed on a durable physical medium customarily used for software interchange.
+
+     b) Convey the object code in, or embodied in, a physical product (including a physical distribution medium), accompanied by a written offer, valid for at least three years and valid for as long as you offer spare parts or customer support for that product model, to give anyone who possesses the object code either (1) a copy of the Corresponding Source for all the software in the product that is covered by this License, on a durable physical medium customarily used for software interchange, for a price no more than your reasonable cost of physically performing this conveying of source, or (2) access to copy the Corresponding Source from a network server at no charge.
+
+     c) Convey individual copies of the object code with a copy of the written offer to provide the Corresponding Source. This alternative is allowed only occasionally and noncommercially, and only if you received the object code with such an offer, in accord with subsection 6b.
+
+     d) Convey the object code by offering access from a designated place (gratis or for a charge), and offer equivalent access to the Corresponding Source in the same way through the same place at no further charge. You need not require recipients to copy the Corresponding Source along with the object code. If the place to copy the object code is a network server, the Corresponding Source may be on a different server (operated by you or a third party) that supports equivalent copying facilities, provided you maintain clear directions next to the object code saying where to find the Corresponding Source. Regardless of what server hosts the Corresponding Source, you remain obligated to ensure that it is available for as long as needed to satisfy these requirements.
+
+     e) Convey the object code using peer-to-peer transmission, provided you inform other peers where the object code and Corresponding Source of the work are being offered to the general public at no charge under subsection 6d.
+
+A separable portion of the object code, whose source code is excluded from the Corresponding Source as a System Library, need not be included in conveying the object code work.
+
+A “User Product” is either (1) a “consumer product”, which means any tangible personal property which is normally used for personal, family, or household purposes, or (2) anything designed or sold for incorporation into a dwelling. In determining whether a product is a consumer product, doubtful cases shall be resolved in favor of coverage. For a particular product received by a particular user, “normally used” refers to a typical or common use of that class of product, regardless of the status of the particular user or of the way in which the particular user actually uses, or expects or is expected to use, the product. A product is a consumer product regardless of whether the product has substantial commercial, industrial or non-consumer uses, unless such uses represent the only significant mode of use of the product.
+
+“Installation Information” for a User Product means any methods, procedures, authorization keys, or other information required to install and execute modified versions of a covered work in that User Product from a modified version of its Corresponding Source. The information must suffice to ensure that the continued functioning of the modified object code is in no case prevented or interfered with solely because modification has been made.
+
+If you convey an object code work under this section in, or with, or specifically for use in, a User Product, and the conveying occurs as part of a transaction in which the right of possession and use of the User Product is transferred to the recipient in perpetuity or for a fixed term (regardless of how the transaction is characterized), the Corresponding Source conveyed under this section must be accompanied by the Installation Information. But this requirement does not apply if neither you nor any third party retains the ability to install modified object code on the User Product (for example, the work has been installed in ROM).
+
+The requirement to provide Installation Information does not include a requirement to continue to provide support service, warranty, or updates for a work that has been modified or installed by the recipient, or for the User Product in which it has been modified or installed. Access to a network may be denied when the modification itself materially and adversely affects the operation of the network or violates the rules and protocols for communication across the network.
+
+Corresponding Source conveyed, and Installation Information provided, in accord with this section must be in a format that is publicly documented (and with an implementation available to the public in source code form), and must require no special password or key for unpacking, reading or copying.
+
+7. Additional Terms.
+“Additional permissions” are terms that supplement the terms of this License by making exceptions from one or more of its conditions. Additional permissions that are applicable to the entire Program shall be treated as though they were included in this License, to the extent that they are valid under applicable law. If additional permissions apply only to part of the Program, that part may be used separately under those permissions, but the entire Program remains governed by this License without regard to the additional permissions.
+
+When you convey a copy of a covered work, you may at your option remove any additional permissions from that copy, or from any part of it. (Additional permissions may be written to require their own removal in certain cases when you modify the work.) You may place additional permissions on material, added by you to a covered work, for which you have or can give appropriate copyright permission.
+
+Notwithstanding any other provision of this License, for material you add to a covered work, you may (if authorized by the copyright holders of that material) supplement the terms of this License with terms:
+
+     a) Disclaiming warranty or limiting liability differently from the terms of sections 15 and 16 of this License; or
+
+     b) Requiring preservation of specified reasonable legal notices or author attributions in that material or in the Appropriate Legal Notices displayed by works containing it; or
+
+     c) Prohibiting misrepresentation of the origin of that material, or requiring that modified versions of such material be marked in reasonable ways as different from the original version; or
+
+     d) Limiting the use for publicity purposes of names of licensors or authors of the material; or
+
+     e) Declining to grant rights under trademark law for use of some trade names, trademarks, or service marks; or
+
+     f) Requiring indemnification of licensors and authors of that material by anyone who conveys the material (or modified versions of it) with contractual assumptions of liability to the recipient, for any liability that these contractual assumptions directly impose on those licensors and authors.
+
+All other non-permissive additional terms are considered “further restrictions” within the meaning of section 10. If the Program as you received it, or any part of it, contains a notice stating that it is governed by this License along with a term that is a further restriction, you may remove that term. If a license document contains a further restriction but permits relicensing or conveying under this License, you may add to a covered work material governed by the terms of that license document, provided that the further restriction does not survive such relicensing or conveying.
+
+If you add terms to a covered work in accord with this section, you must place, in the relevant source files, a statement of the additional terms that apply to those files, or a notice indicating where to find the applicable terms.
+
+Additional terms, permissive or non-permissive, may be stated in the form of a separately written license, or stated as exceptions; the above requirements apply either way.
+
+8. Termination.
+You may not propagate or modify a covered work except as expressly provided under this License. Any attempt otherwise to propagate or modify it is void, and will automatically terminate your rights under this License (including any patent licenses granted under the third paragraph of section 11).
+
+However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice.
+
+Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, you do not qualify to receive new licenses for the same material under section 10.
+
+9. Acceptance Not Required for Having Copies.
+You are not required to accept this License in order to receive or run a copy of the Program. Ancillary propagation of a covered work occurring solely as a consequence of using peer-to-peer transmission to receive a copy likewise does not require acceptance. However, nothing other than this License grants you permission to propagate or modify any covered work. These actions infringe copyright if you do not accept this License. Therefore, by modifying or propagating a covered work, you indicate your acceptance of this License to do so.
+
+10. Automatic Licensing of Downstream Recipients.
+Each time you convey a covered work, the recipient automatically receives a license from the original licensors, to run, modify and propagate that work, subject to this License. You are not responsible for enforcing compliance by third parties with this License.
+
+An “entity transaction” is a transaction transferring control of an organization, or substantially all assets of one, or subdividing an organization, or merging organizations. If propagation of a covered work results from an entity transaction, each party to that transaction who receives a copy of the work also receives whatever licenses to the work the party's predecessor in interest had or could give under the previous paragraph, plus a right to possession of the Corresponding Source of the work from the predecessor in interest, if the predecessor has it or can get it with reasonable efforts.
+
+You may not impose any further restrictions on the exercise of the rights granted or affirmed under this License. For example, you may not impose a license fee, royalty, or other charge for exercise of rights granted under this License, and you may not initiate litigation (including a cross-claim or counterclaim in a lawsuit) alleging that any patent claim is infringed by making, using, selling, offering for sale, or importing the Program or any portion of it.
+
+11. Patents.
+A “contributor” is a copyright holder who authorizes use under this License of the Program or a work on which the Program is based. The work thus licensed is called the contributor's “contributor version”.
+
+A contributor's “essential patent claims” are all patent claims owned or controlled by the contributor, whether already acquired or hereafter acquired, that would be infringed by some manner, permitted by this License, of making, using, or selling its contributor version, but do not include claims that would be infringed only as a consequence of further modification of the contributor version. For purposes of this definition, “control” includes the right to grant patent sublicenses in a manner consistent with the requirements of this License.
+
+Each contributor grants you a non-exclusive, worldwide, royalty-free patent license under the contributor's essential patent claims, to make, use, sell, offer for sale, import and otherwise run, modify and propagate the contents of its contributor version.
+
+In the following three paragraphs, a “patent license” is any express agreement or commitment, however denominated, not to enforce a patent (such as an express permission to practice a patent or covenant not to sue for patent infringement). To “grant” such a patent license to a party means to make such an agreement or commitment not to enforce a patent against the party.
+
+If you convey a covered work, knowingly relying on a patent license, and the Corresponding Source of the work is not available for anyone to copy, free of charge and under the terms of this License, through a publicly available network server or other readily accessible means, then you must either (1) cause the Corresponding Source to be so available, or (2) arrange to deprive yourself of the benefit of the patent license for this particular work, or (3) arrange, in a manner consistent with the requirements of this License, to extend the patent license to downstream recipients. “Knowingly relying” means you have actual knowledge that, but for the patent license, your conveying the covered work in a country, or your recipient's use of the covered work in a country, would infringe one or more identifiable patents in that country that you have reason to believe are valid.
+
+If, pursuant to or in connection with a single transaction or arrangement, you convey, or propagate by procuring conveyance of, a covered work, and grant a patent license to some of the parties receiving the covered work authorizing them to use, propagate, modify or convey a specific copy of the covered work, then the patent license you grant is automatically extended to all recipients of the covered work and works based on it.
+
+A patent license is “discriminatory” if it does not include within the scope of its coverage, prohibits the exercise of, or is conditioned on the non-exercise of one or more of the rights that are specifically granted under this License. You may not convey a covered work if you are a party to an arrangement with a third party that is in the business of distributing software, under which you make payment to the third party based on the extent of your activity of conveying the work, and under which the third party grants, to any of the parties who would receive the covered work from you, a discriminatory patent license (a) in connection with copies of the covered work conveyed by you (or copies made from those copies), or (b) primarily for and in connection with specific products or compilations that contain the covered work, unless you entered into that arrangement, or that patent license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law.
+
+12. No Surrender of Others' Freedom.
+If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program.
+
+13. Use with the GNU Affero General Public License.
+Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such.
+
+14. Revised Versions of this License.
+The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License “or any later version” applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the GNU General Public License, you may choose any version ever published by the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions of the GNU General Public License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Program.
+
+Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version.
+
+15. Disclaimer of Warranty.
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+16. Limitation of Liability.
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+17. Interpretation of Sections 15 and 16.
+If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.
+
+     <one line to give the program's name and a brief idea of what it does.>
+     Copyright (C) <year>  <name of author>
+
+     This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+     You should have received a copy of the GNU General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
+
+     <program>  Copyright (C) <year>  <name of author>
+     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+     This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an “about box”.
+
+You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <http://www.gnu.org/licenses/>.
+
+The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.

LICENSES/MIT.txt

@@ -0,0 +1,9 @@
+MIT License
+
+Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

MODULE.bazel

@@ -0,0 +1,7 @@
+module(
+    name = "nlohmann_json",
+    compatibility_level = 1,
+)
+
+bazel_dep(name = "rules_cc", version = "0.0.17")
+bazel_dep(name = "rules_license", version = "1.0.0")

Makefile

@@ -1,38 +1,58 @@
-.PHONY: pretty clean ChangeLog.md
+.PHONY: pretty clean ChangeLog.md release
 
-# used programs
-RE2C = re2c
-SED = sed
+##########################################################################
+# configuration
+##########################################################################
+
+# find GNU sed to use `-i` parameter
+SED:=$(shell command -v gsed || which sed)
+
+
+##########################################################################
+# source files
+##########################################################################
+
+# the list of sources in the include folder
+SRCS=$(shell find include -type f | sort)
+
+# the list of sources in the tests folder
+TESTS_SRCS=$(shell find tests -type f \( -name '*.hpp' -o -name '*.cpp' -o -name '*.cu' \) -not -path 'tests/thirdparty/*' -not -path 'tests/abi/include/nlohmann/*' | sort)
+
+# the single headers (amalgamated from the source files)
+AMALGAMATED_FILE=single_include/nlohmann/json.hpp
+AMALGAMATED_FWD_FILE=single_include/nlohmann/json_fwd.hpp
+
+
+##########################################################################
+# documentation of the Makefile's targets
+##########################################################################
 
 # main target
-all: json_unit
-
-# clean up
-clean:
-	rm -fr json_unit json_benchmarks fuzz fuzz-testing *.dSYM
-	rm -fr benchmarks/files/numbers/*.json
-	$(MAKE) clean -Cdoc
+all:
+	@echo "amalgamate - amalgamate files single_include/nlohmann/json{,_fwd}.hpp from the include/nlohmann sources"
+	@echo "ChangeLog.md - generate ChangeLog file"
+	@echo "check-amalgamation - check whether sources have been amalgamated"
+	@echo "clean - remove built files"
+	@echo "doctest - compile example files and check their output"
+	@echo "fuzz_testing - prepare fuzz testing of the JSON parser"
+	@echo "fuzz_testing_bson - prepare fuzz testing of the BSON parser"
+	@echo "fuzz_testing_cbor - prepare fuzz testing of the CBOR parser"
+	@echo "fuzz_testing_msgpack - prepare fuzz testing of the MessagePack parser"
+	@echo "fuzz_testing_ubjson - prepare fuzz testing of the UBJSON parser"
+	@echo "pretty - beautify code with Artistic Style"
+	@echo "run_benchmarks - build and run benchmarks"
 
 
 ##########################################################################
-# unit tests
+# benchmarks
 ##########################################################################
 
-# additional flags
-FLAGS = -Wall -Wextra -pedantic -Weffc++ -Wcast-align -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wmissing-declarations -Wmissing-include-dirs -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion -Wsign-promo -Wstrict-overflow=5 -Wswitch -Wundef -Wno-unused -Wnon-virtual-dtor -Wreorder -Wdeprecated -Wfloat-equal
-
-# build unit tests (TODO: Does this want its own makefile?)
-json_unit: test/src/unit.cpp src/json.hpp test/src/catch.hpp
-	$(CXX) -std=c++11 $(CXXFLAGS) $(FLAGS) $(CPPFLAGS) -I src -I test $< $(LDFLAGS) -o $@
-
-
-##########################################################################
-# documentation tests
-##########################################################################
-
-# compile example files and check output
-doctest:
-	$(MAKE) check_output -C doc
+run_benchmarks:
+	rm -fr cmake-build-benchmarks
+	mkdir cmake-build-benchmarks
+	cd cmake-build-benchmarks ; cmake ../tests/benchmarks -GNinja -DCMAKE_BUILD_TYPE=Release
+	cd cmake-build-benchmarks ; ninja
+	cd cmake-build-benchmarks ; ./json_benchmarks
 
 
 ##########################################################################
@@ -43,61 +63,204 @@ doctest:
 fuzz_testing:
 	rm -fr fuzz-testing
 	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
-	$(MAKE) fuzz CXX=afl-clang++
-	mv fuzz fuzz-testing
-	find test/data/json_tests -size -5k -name *json | xargs -I{} cp "{}" fuzz-testing/testcases
-	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzz"
+	$(MAKE) parse_afl_fuzzer -C tests CXX=afl-clang++
+	mv tests/parse_afl_fuzzer fuzz-testing/fuzzer
+	find tests/data/json_tests -size -5k -name *json | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
 
-# the fuzzer binary
-fuzz: test/src/fuzz.cpp src/json.hpp
-	$(CXX) -std=c++11 $(CXXFLAGS) $(FLAGS) $(CPPFLAGS) -I src $< $(LDFLAGS) -o $@
+fuzz_testing_bson:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_bson_fuzzer -C tests CXX=afl-clang++
+	mv tests/parse_bson_fuzzer fuzz-testing/fuzzer
+	find tests/data -size -5k -name *.bson | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_cbor:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_cbor_fuzzer -C tests CXX=afl-clang++
+	mv tests/parse_cbor_fuzzer fuzz-testing/fuzzer
+	find tests/data -size -5k -name *.cbor | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_msgpack:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_msgpack_fuzzer -C tests CXX=afl-clang++
+	mv tests/parse_msgpack_fuzzer fuzz-testing/fuzzer
+	find tests/data -size -5k -name *.msgpack | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_ubjson:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_ubjson_fuzzer -C tests CXX=afl-clang++
+	mv tests/parse_ubjson_fuzzer fuzz-testing/fuzzer
+	find tests/data -size -5k -name *.ubjson | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzzing-start:
+	afl-fuzz -S fuzzer1 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer2 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer3 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer4 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer5 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer6 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer7 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -M fuzzer0 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer
+
+fuzzing-stop:
+	-killall fuzzer
+	-killall afl-fuzz
 
 
 ##########################################################################
-# static analyzer
+# Static analysis
 ##########################################################################
 
-# call cppcheck on the main header file
-cppcheck:
-	cppcheck --enable=all --inconclusive --std=c++11 src/json.hpp
+# call PVS-Studio Analyzer <https://www.viva64.com/en/pvs-studio/>
+pvs_studio:
+	rm -fr cmake-build-pvs-studio
+	mkdir cmake-build-pvs-studio
+	cd cmake-build-pvs-studio ; cmake .. -DCMAKE_EXPORT_COMPILE_COMMANDS=On -DJSON_MultipleHeaders=ON
+	cd cmake-build-pvs-studio ; pvs-studio-analyzer analyze -j 10
+	cd cmake-build-pvs-studio ; plog-converter -a'GA:1,2;64:1;CS' -t fullhtml PVS-Studio.log -o pvs
+	open cmake-build-pvs-studio/pvs/index.html
 
 
 ##########################################################################
-# maintainer targets
+# Code format and source amalgamation
 ##########################################################################
 
-# create scanner with re2c
-re2c: src/json.hpp.re2c
-	$(RE2C) -W --bit-vectors --nested-ifs --no-debug-info $< | $(SED) '1d' > src/json.hpp
+ASTYLE=tools/astyle/venv/bin/astyle
 
-# pretty printer
-pretty:
-	astyle --style=allman --indent=spaces=4 --indent-modifiers \
-	   --indent-switches --indent-preproc-block --indent-preproc-define \
-	   --indent-col1-comments --pad-oper --pad-header --align-pointer=type \
-	   --align-reference=type --add-brackets --convert-tabs --close-templates \
-	   --lineend=linux --preserve-date --suffix=none --formatted \
-	   src/json.hpp src/json.hpp.re2c test/src/unit.cpp test/src/fuzz.cpp benchmarks/benchmarks.cpp doc/examples/*.cpp
+install_astyle:
+	@test -d tools/astyle/venv || python3 -mvenv tools/astyle/venv ; tools/astyle/venv/bin/pip3 install --quiet --upgrade pip
+	@test -f $(ASTYLE) || tools/astyle/venv/bin/pip3 install --quiet -r tools/astyle/requirements.txt
+	@$(ASTYLE) --version
 
+# call the Artistic Style pretty printer on all source files
+pretty: install_astyle
+	$(ASTYLE) --project=tools/astyle/.astylerc $(SRCS) $(TESTS_SRCS) $(AMALGAMATED_FILE) $(AMALGAMATED_FWD_FILE) docs/mkdocs/docs/examples/*.cpp
+
+# call the Clang-Format on all source files
+pretty_format:
+	for FILE in $(SRCS) $(TESTS_SRCS) $(AMALGAMATED_FILE) docs/mkdocs/docs/examples/*.cpp; do echo $$FILE; clang-format -i $$FILE; done
+
+# create single header files and pretty print
+amalgamate: $(AMALGAMATED_FILE) $(AMALGAMATED_FWD_FILE)
+	$(MAKE) pretty
+
+# call the amalgamation tool for json.hpp
+$(AMALGAMATED_FILE): $(SRCS)
+	tools/amalgamate/amalgamate.py -c tools/amalgamate/config_json.json -s . --verbose=yes
+
+# call the amalgamation tool for json_fwd.hpp
+$(AMALGAMATED_FWD_FILE): $(SRCS)
+	tools/amalgamate/amalgamate.py -c tools/amalgamate/config_json_fwd.json -s . --verbose=yes
+
+# check if file single_include/nlohmann/json.hpp has been amalgamated from the nlohmann sources
+# Note: this target is called by Travis
+check-amalgamation:
+	@mv $(AMALGAMATED_FILE) $(AMALGAMATED_FILE)~
+	@mv $(AMALGAMATED_FWD_FILE) $(AMALGAMATED_FWD_FILE)~
+	@$(MAKE) amalgamate
+	@diff $(AMALGAMATED_FILE) $(AMALGAMATED_FILE)~ || (echo "===================================================================\n  Amalgamation required! Please read the contribution guidelines\n  in file .github/CONTRIBUTING.md.\n===================================================================" ; mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE) ; false)
+	@diff $(AMALGAMATED_FWD_FILE) $(AMALGAMATED_FWD_FILE)~ || (echo "===================================================================\n  Amalgamation required! Please read the contribution guidelines\n  in file .github/CONTRIBUTING.md.\n===================================================================" ; mv $(AMALGAMATED_FWD_FILE)~ $(AMALGAMATED_FWD_FILE) ; false)
+	@mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE)
+	@mv $(AMALGAMATED_FWD_FILE)~ $(AMALGAMATED_FWD_FILE)
+
+BUILD.bazel: $(SRCS)
+	cmake -P cmake/scripts/gen_bazel_build_file.cmake
 
 ##########################################################################
-# benchmarks
+# ChangeLog
 ##########################################################################
 
-# benchmarks
-json_benchmarks: benchmarks/benchmarks.cpp benchmarks/benchpress.hpp benchmarks/cxxopts.hpp src/json.hpp
-	cd benchmarks/files/numbers ; python generate.py
-	$(CXX) -std=c++11 $(CXXFLAGS) -O3 -flto -I src -I benchmarks $< $(LDFLAGS) -o $@
-	./json_benchmarks
-
-
-##########################################################################
-# changelog
-##########################################################################
+# Create a ChangeLog based on the git log using the GitHub Changelog Generator
+# (<https://github.com/github-changelog-generator/github-changelog-generator>).
 
+# variable to control the diffs between the last released version and the current repository state
 NEXT_VERSION ?= "unreleased"
 
 ChangeLog.md:
-	github_changelog_generator -o ChangeLog.md --simple-list --release-url https://github.com/nlohmann/json/releases/tag/%s --future-release $(NEXT_VERSION)
-	gsed -i 's|https://github.com/nlohmann/json/releases/tag/HEAD|https://github.com/nlohmann/json/tree/HEAD|' ChangeLog.md
-	gsed -i '2i All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/).' ChangeLog.md
+	github_changelog_generator -o ChangeLog.md --user nlohmann --project json --simple-list --release-url https://github.com/nlohmann/json/releases/tag/%s --future-release $(NEXT_VERSION)
+	$(SED) -i 's|https://github.com/nlohmann/json/releases/tag/HEAD|https://github.com/nlohmann/json/tree/HEAD|' ChangeLog.md
+	$(SED) -i '2i All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/).' ChangeLog.md
+
+
+##########################################################################
+# Release files
+##########################################################################
+
+# Create a tar.xz archive that contains sufficient files to be used as CMake project (e.g., using FetchContent). The
+# archive is created according to the advices of <https://reproducible-builds.org/docs/archives/>.
+json.tar.xz:
+	mkdir json
+	rsync -R $(shell find LICENSE.MIT nlohmann_json.natvis CMakeLists.txt cmake/*.in include single_include -type f) json
+	gtar --sort=name --mtime="@$(shell git log -1 --pretty=%ct)" --owner=0 --group=0 --numeric-owner --pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime --create --file - json | xz --compress -9e --threads=2 - > json.tar.xz
+	rm -fr json
+
+# We use `-X` to make the resulting ZIP file reproducible, see
+# <https://content.pivotal.io/blog/barriers-to-deterministic-reproducible-zip-files>.
+include.zip: BUILD.bazel
+	zip -9 --recurse-paths -X include.zip $(SRCS) $(AMALGAMATED_FILE) $(AMALGAMATED_FWD_FILE) BUILD.bazel WORKSPACE.bazel meson.build LICENSE.MIT
+
+# Create the files for a release and add signatures and hashes.
+release: include.zip json.tar.xz
+	rm -fr release_files
+	mkdir release_files
+	gpg --armor --detach-sig include.zip
+	gpg --armor --detach-sig $(AMALGAMATED_FILE)
+	gpg --armor --detach-sig $(AMALGAMATED_FWD_FILE)
+	gpg --armor --detach-sig json.tar.xz
+	cp $(AMALGAMATED_FILE) release_files
+	cp $(AMALGAMATED_FWD_FILE) release_files
+	mv $(AMALGAMATED_FILE).asc $(AMALGAMATED_FWD_FILE).asc json.tar.xz json.tar.xz.asc include.zip include.zip.asc release_files
+	cd release_files ; shasum -a 256 json.hpp include.zip json.tar.xz > hashes.txt
+
+
+##########################################################################
+# Maintenance
+##########################################################################
+
+# clean up
+clean:
+	rm -fr fuzz fuzz-testing *.dSYM tests/*.dSYM
+	rm -fr benchmarks/files/numbers/*.json
+	rm -fr cmake-build-benchmarks fuzz-testing cmake-build-pvs-studio release_files
+	$(MAKE) clean -Cdocs
+
+
+##########################################################################
+# Thirdparty code
+##########################################################################
+
+update_hedley:
+	rm -f include/nlohmann/thirdparty/hedley/hedley.hpp include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+	curl https://raw.githubusercontent.com/nemequ/hedley/master/hedley.h -o include/nlohmann/thirdparty/hedley/hedley.hpp
+	$(SED) -i 's/HEDLEY_/JSON_HEDLEY_/g' include/nlohmann/thirdparty/hedley/hedley.hpp
+	grep "[[:blank:]]*#[[:blank:]]*undef" include/nlohmann/thirdparty/hedley/hedley.hpp | grep -v "__" | sort | uniq | $(SED) 's/ //g' | $(SED) 's/undef/undef /g' > include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+	$(SED) -i '1s/^/#pragma once\n\n/' include/nlohmann/thirdparty/hedley/hedley.hpp
+	$(SED) -i '1s/^/#pragma once\n\n/' include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+	$(MAKE) amalgamate
+
+##########################################################################
+# serve_header.py
+##########################################################################
+
+serve_header:
+	./tools/serve_header/serve_header.py --make $(MAKE)
+
+##########################################################################
+# REUSE
+##########################################################################
+
+reuse:
+	pipx run reuse annotate --recursive single_include include -tjson --license MIT --copyright "Niels Lohmann <https://nlohmann.me>" --year "2013-2026" --merge-copyrights
+	pipx run reuse annotate $(TESTS_SRCS) -tjson_support --license MIT --copyright "Niels Lohmann <https://nlohmann.me>" --year "2013-2026" --merge-copyrights
+	pipx run reuse lint
+
+spdx:
+	pipx run reuse spdx --output nlohmann_json.spdx --creator-person "Niels Lohmann" --add-license-concluded

Package.swift

@@ -0,0 +1,22 @@
+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "nlohmann-json",
+     platforms: [
+        .iOS(.v12), .macOS(.v10_13), .tvOS(.v12), .watchOS(.v4), .visionOS(.v1)
+    ],
+    products: [
+        .library(name: "json", targets: ["json"])
+    ],
+    targets: [
+        .target(
+            name: "json",
+            path: "single_include/nlohmann",
+            publicHeadersPath: "."
+        )
+    ],
+    cxxLanguageStandard: .cxx11
+)

appveyor.yml

@@ -1,10 +0,0 @@
-version: '{build}'
-os: Visual Studio 2015
-init: []
-install: []
-build_script:
-- set PATH=C:\Program Files (x86)\MSBuild\14.0\Bin;%PATH%
-- cmake . -G "Visual Studio 14 2015"
-- cmake --build . --config Release
-test_script:
-- ctest -C Release -V

benchmarks/benchmarks.cpp

@@ -1,107 +0,0 @@
-#define BENCHPRESS_CONFIG_MAIN
-
-#include <fstream>
-#include <benchpress.hpp>
-#include <json.hpp>
-
-BENCHMARK("parse jeopardy.json", [](benchpress::context* ctx)
-{
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        std::ifstream input_file("benchmarks/files/jeopardy/jeopardy.json");
-        nlohmann::json j;
-        j << input_file;
-    }
-})
-
-BENCHMARK("parse canada.json", [](benchpress::context* ctx)
-{
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        std::ifstream input_file("benchmarks/files/nativejson-benchmark/canada.json");
-        nlohmann::json j;
-        j << input_file;
-    }
-})
-
-BENCHMARK("parse citm_catalog.json", [](benchpress::context* ctx)
-{
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        std::ifstream input_file("benchmarks/files/nativejson-benchmark/citm_catalog.json");
-        nlohmann::json j;
-        j << input_file;
-    }
-})
-
-BENCHMARK("parse twitter.json", [](benchpress::context* ctx)
-{
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        std::ifstream input_file("benchmarks/files/nativejson-benchmark/twitter.json");
-        nlohmann::json j;
-        j << input_file;
-    }
-})
-
-BENCHMARK("parse numbers/floats.json", [](benchpress::context* ctx)
-{
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        std::ifstream input_file("benchmarks/files/numbers/floats.json");
-        nlohmann::json j;
-        j << input_file;
-    }
-})
-
-BENCHMARK("parse numbers/signed_ints.json", [](benchpress::context* ctx)
-{
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        std::ifstream input_file("benchmarks/files/numbers/signed_ints.json");
-        nlohmann::json j;
-        j << input_file;
-    }
-})
-
-BENCHMARK("parse numbers/unsigned_ints.json", [](benchpress::context* ctx)
-{
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        std::ifstream input_file("benchmarks/files/numbers/unsigned_ints.json");
-        nlohmann::json j;
-        j << input_file;
-    }
-})
-
-BENCHMARK("dump jeopardy.json", [](benchpress::context* ctx)
-{
-    std::ifstream input_file("benchmarks/files/jeopardy/jeopardy.json");
-    nlohmann::json j;
-    j << input_file;
-    std::ofstream output_file("jeopardy.dump.json");
-
-    ctx->reset_timer();
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        output_file << j;
-    }
-
-    std::remove("jeopardy.dump.json");
-})
-
-BENCHMARK("dump jeopardy.json with indent", [](benchpress::context* ctx)
-{
-    std::ifstream input_file("benchmarks/files/jeopardy/jeopardy.json");
-    nlohmann::json j;
-    j << input_file;
-    std::ofstream output_file("jeopardy.dump.json");
-
-    ctx->reset_timer();
-    for (size_t i = 0; i < ctx->num_iterations(); ++i)
-    {
-        output_file << std::setw(4) << j;
-    }
-
-    std::remove("jeopardy.dump.json");
-})

benchmarks/benchpress.hpp

@@ -1,401 +0,0 @@
-/*
-* Copyright (C) 2015 Christopher Gilbert.
-*
-* Permission is hereby granted, free of charge, to any person obtaining a copy
-* of this software and associated documentation files (the "Software"), to deal
-* in the Software without restriction, including without limitation the rights
-* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-* copies of the Software, and to permit persons to whom the Software is
-* furnished to do so, subject to the following conditions:
-*
-* The above copyright notice and this permission notice shall be included in all
-* copies or substantial portions of the Software.
-*
-* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-* SOFTWARE.
-*/
-#ifndef BENCHPRESS_HPP
-#define BENCHPRESS_HPP
-
-#include <algorithm>   // max, min
-#include <atomic>      // atomic_intmax_t
-#include <chrono>      // high_resolution_timer, duration
-#include <functional>  // function
-#include <iomanip>     // setw
-#include <iostream>    // cout
-#include <regex>       // regex, regex_match
-#include <sstream>     // stringstream
-#include <string>      // string
-#include <thread>      // thread
-#include <vector>      // vector
-
-namespace benchpress {
-
-/*
- * The options class encapsulates all options for running benchmarks.
- *
- * When including benchpress, a main function can be emitted which includes a command-line parser for building an
- * options object. However from time-to-time it may be necessary for the developer to have to build their own main
- * stub and construct the options object manually.
- *
- * options opts;
- * opts
- *     .bench(".*")
- *     .benchtime(1)
- *     .cpu(4);
- */
-class options {
-    std::string d_bench;
-    size_t      d_benchtime;
-    size_t      d_cpu;
-public:
-    options()
-        : d_bench(".*")
-        , d_benchtime(1)
-        , d_cpu(std::thread::hardware_concurrency())
-    {}
-    options& bench(const std::string& bench) {
-        d_bench = bench;
-        return *this;
-    }
-    options& benchtime(size_t benchtime) {
-        d_benchtime = benchtime;
-        return *this;
-    }
-    options& cpu(size_t cpu) {
-        d_cpu = cpu;
-        return *this;
-    }
-    std::string get_bench() const {
-        return d_bench;
-    }
-    size_t get_benchtime() const {
-        return d_benchtime;
-    }
-    size_t get_cpu() const {
-        return d_cpu;
-    }
-};
-
-class context;
-
-/*
- * The benchmark_info class is used to store a function name / pointer pair.
- *
- * benchmark_info bi("example", [](benchpress::context* b) {
- *     // benchmark function
- * });
- */
-class benchmark_info {
-    std::string                   d_name;
-    std::function<void(context*)> d_func;
-
-public:
-    benchmark_info(std::string name, std::function<void(context*)> func)
-        : d_name(name)
-        , d_func(func)
-    {}
-
-    std::string                   get_name() const { return d_name; }
-    std::function<void(context*)> get_func() const { return d_func; }
-};
-
-/*
- * The registration class is responsible for providing a single global point of reference for registering
- * benchmark functions.
- *
- * registration::get_ptr()->register_benchmark(info);
- */
-class registration {
-    static registration*        d_this;
-    std::vector<benchmark_info> d_benchmarks;
-
-public:
-    static registration* get_ptr() {
-        if (nullptr == d_this) {
-            d_this = new registration();
-        }
-        return d_this;
-    }
-
-    void register_benchmark(benchmark_info& info) {
-        d_benchmarks.push_back(info);
-    }
-
-    std::vector<benchmark_info> get_benchmarks() { return d_benchmarks; }
-};
-
-/*
- * The auto_register class is a helper used to register benchmarks.
- */
-class auto_register {
-public:
-    auto_register(const std::string& name, std::function<void(context*)> func) {
-        benchmark_info info(name, func);
-        registration::get_ptr()->register_benchmark(info);
-    }
-};
-
-#define CONCAT(x, y) x ## y
-#define CONCAT2(x, y) CONCAT(x, y)
-
-// The BENCHMARK macro is a helper for creating benchmark functions and automatically registering them with the
-// registration class.
-#define BENCHMARK(x, f) benchpress::auto_register CONCAT2(register_, __LINE__)((x), (f));
-
-// This macro will prevent the compiler from removing a redundant code path which has no side-effects.
-#define DISABLE_REDUNDANT_CODE_OPT() { asm(""); }
-
-/*
- * The result class is responsible for producing a printable string representation of a benchmark run.
- */
-class result {
-    size_t                   d_num_iterations;
-    std::chrono::nanoseconds d_duration;
-    size_t                   d_num_bytes;
-
-public:
-    result(size_t num_iterations, std::chrono::nanoseconds duration, size_t num_bytes)
-        : d_num_iterations(num_iterations)
-        , d_duration(duration)
-        , d_num_bytes(num_bytes)
-    {}
-
-    size_t get_ns_per_op() const {
-        if (d_num_iterations <= 0) {
-            return 0;
-        }
-        return d_duration.count() / d_num_iterations;
-    }
-
-    double get_mb_per_s() const {
-        if (d_num_iterations <= 0 || d_duration.count() <= 0 || d_num_bytes <= 0) {
-            return 0;
-        }
-        return ((double(d_num_bytes) * double(d_num_iterations) / double(1e6)) /
-                double(std::chrono::duration_cast<std::chrono::seconds>(d_duration).count()));
-    }
-
-    std::string to_string() const {
-        std::stringstream tmp;
-        tmp << std::setw(12) << std::right << d_num_iterations;
-        size_t npo = get_ns_per_op();
-        tmp << std::setw(12) << std::right << npo << std::setw(0) << " ns/op";
-        double mbs = get_mb_per_s();
-        if (mbs > 0.0) {
-            tmp << std::setw(12) << std::right << mbs << std::setw(0) << " MB/s";
-        }
-        return std::string(tmp.str());
-    }
-};
-
-/*
- * The parallel_context class is responsible for providing a thread-safe context for parallel benchmark code.
- */
-class parallel_context {
-    std::atomic_intmax_t d_num_iterations;
-public:
-    parallel_context(size_t num_iterations)
-        : d_num_iterations(num_iterations)
-    {}
-
-    bool next() {
-        return (d_num_iterations.fetch_sub(1) > 0);
-    }
-};
-
-/*
- * The context class is responsible for providing an interface for capturing benchmark metrics to benchmark functions.
- */
-class context {
-    bool                                           d_timer_on;
-    std::chrono::high_resolution_clock::time_point d_start;
-    std::chrono::nanoseconds                       d_duration;
-    std::chrono::seconds                           d_benchtime;
-    size_t                                         d_num_iterations;
-    size_t                                         d_num_threads;
-    size_t                                         d_num_bytes;
-    benchmark_info                                 d_benchmark;
-
-public:
-    context(const benchmark_info& info, const options& opts)
-        : d_timer_on(false)
-        , d_start()
-        , d_duration()
-        , d_benchtime(std::chrono::seconds(opts.get_benchtime()))
-        , d_num_iterations(1)
-        , d_num_threads(opts.get_cpu())
-        , d_num_bytes(0)
-        , d_benchmark(info)
-    {}
-
-    size_t num_iterations() const { return d_num_iterations; }
-
-    void set_num_threads(size_t n) { d_num_threads = n; }
-    size_t num_threads() const { return d_num_threads; }
-
-    void start_timer() {
-        if (!d_timer_on) {
-            d_start = std::chrono::high_resolution_clock::now();
-            d_timer_on = true;
-        }
-    }
-    void stop_timer() {
-        if (d_timer_on) {
-            d_duration += std::chrono::high_resolution_clock::now() - d_start;
-            d_timer_on = false;
-        }
-    }
-    void reset_timer() {
-        if (d_timer_on) {
-            d_start = std::chrono::high_resolution_clock::now();
-        }
-        d_duration = std::chrono::nanoseconds::zero();
-    }
-
-    void set_bytes(int64_t bytes) { d_num_bytes = bytes; }
-
-    size_t get_ns_per_op() {
-        if (d_num_iterations <= 0) {
-            return 0;
-        }
-        return d_duration.count() / d_num_iterations;
-    }
-
-    void run_n(size_t n) {
-        d_num_iterations = n;
-        reset_timer();
-        start_timer();
-        d_benchmark.get_func()(this);
-        stop_timer();
-    }
-
-    void run_parallel(std::function<void(parallel_context*)> f) {
-        parallel_context pc(d_num_iterations);
-        std::vector<std::thread> threads;
-        for (size_t i = 0; i < d_num_threads; ++i) {
-            threads.push_back(std::thread([&pc,&f]() -> void {
-                f(&pc);
-            }));
-        }
-        for(auto& thread : threads){
-            thread.join();
-        }
-    }
-
-    result run() {
-        size_t n = 1;
-        run_n(n);
-        while (d_duration < d_benchtime && n < 1e9) {
-            size_t last = n;
-            if (get_ns_per_op() == 0) {
-                n = 1e9;
-            } else {
-                n = d_duration.count() / get_ns_per_op();
-            }
-            n = std::max(std::min(n+n/2, 100*last), last+1);
-            n = round_up(n);
-            run_n(n);
-        }
-        return result(n, d_duration, d_num_bytes);
-    }
-
-private:
-    template<typename T>
-    T round_down_10(T n) {
-        int tens = 0;
-        while (n > 10) {
-            n /= 10;
-            tens++;
-        }
-        int result = 1;
-        for (int i = 0; i < tens; ++i) {
-            result *= 10;
-        }
-        return result;
-    }
-
-    template<typename T>
-    T round_up(T n) {
-        T base = round_down_10(n);
-        if (n < (2 * base)) {
-            return 2 * base;
-        }
-        if (n < (5 * base)) {
-            return 5 * base;
-        }
-        return 10 * base;
-    }
-};
-
-/*
- * The run_benchmarks function will run the registered benchmarks.
- */
-void run_benchmarks(const options& opts) {
-    std::regex match_r(opts.get_bench());
-    auto benchmarks = registration::get_ptr()->get_benchmarks();
-    for (auto& info : benchmarks) {
-        if (std::regex_match(info.get_name(), match_r)) {
-            context c(info, opts);
-            auto r = c.run();
-            std::cout << std::setw(35) << std::left << info.get_name() << r.to_string() << std::endl;
-        }
-    }
-}
-
-} // namespace benchpress
-
-/*
- * If BENCHPRESS_CONFIG_MAIN is defined when the file is included then a main function will be emitted which provides a
- * command-line parser and then executes run_benchmarks.
- */
-#ifdef BENCHPRESS_CONFIG_MAIN
-#include "cxxopts.hpp"
-benchpress::registration* benchpress::registration::d_this;
-int main(int argc, char** argv) {
-    std::chrono::high_resolution_clock::time_point bp_start = std::chrono::high_resolution_clock::now();
-    benchpress::options bench_opts;
-    try {
-        cxxopts::Options cmd_opts(argv[0], " - command line options");
-        cmd_opts.add_options()
-            ("bench", "run benchmarks matching the regular expression", cxxopts::value<std::string>()
-                ->default_value(".*"))
-            ("benchtime", "run enough iterations of each benchmark to take t seconds", cxxopts::value<size_t>()
-                ->default_value("1"))
-            ("cpu", "specify the number of threads to use for parallel benchmarks", cxxopts::value<size_t>()
-                ->default_value(std::to_string(std::thread::hardware_concurrency())))
-            ("help", "print help")
-        ;
-        cmd_opts.parse(argc, argv);
-        if (cmd_opts.count("help")) {
-            std::cout << cmd_opts.help({""}) << std::endl;
-            exit(0);
-        }
-        if (cmd_opts.count("bench")) {
-            bench_opts.bench(cmd_opts["bench"].as<std::string>());
-        }
-        if (cmd_opts.count("benchtime")) {
-            bench_opts.benchtime(cmd_opts["benchtime"].as<size_t>());
-        }
-        if (cmd_opts.count("cpu")) {
-            bench_opts.cpu(cmd_opts["cpu"].as<size_t>());
-        }
-    } catch (const cxxopts::OptionException& e) {
-        std::cout << "error parsing options: " << e.what() << std::endl;
-        exit(1);
-    }
-    benchpress::run_benchmarks(bench_opts);
-    float duration = std::chrono::duration_cast<std::chrono::milliseconds>(
-            std::chrono::high_resolution_clock::now() - bp_start
-    ).count() / 1000.f;
-    std::cout << argv[0] << " " << duration << "s" << std::endl;
-    return 0;
-}
-#endif
-
-#endif // BENCHPRESS_HPP

benchmarks/files/numbers/generate.py

@@ -1,25 +0,0 @@
-#!/usr/bin/env python
-
-import json
-import random
-import sys
-
-random.seed(0)
-
-# floats
-result_floats = []
-for x in range(0, 1000000):
-	result_floats.append(random.uniform(-100000000.0, 100000000.0))
-json.dump(result_floats, open("floats.json", "w"), indent=2)
-
-# unsigned integers
-result_uints = []
-for x in range(0, 1000000):
-	result_uints.append(random.randint(0, 18446744073709551615))
-json.dump(result_uints, open("unsigned_ints.json", "w"), indent=2)
-
-# signed integers
-result_sints = []
-for x in range(0, 1000000):
-	result_sints.append(random.randint(-9223372036854775808, 9223372036854775807))
-json.dump(result_sints, open("signed_ints.json", "w"), indent=2)

cmake/ci.cmake

@@ -0,0 +1,725 @@
+# number of parallel jobs for CTest
+set(N 10)
+
+###############################################################################
+# Needed tools.
+###############################################################################
+
+include(FindPython3)
+find_package(Python3 COMPONENTS Interpreter)
+
+find_program(CLANG_TOOL NAMES clang++-HEAD clang++ clang++-20 clang++-19 clang++-18 clang++-17 clang++-16 clang++-15 clang++-14 clang++-13 clang++-12 clang++-11 clang++)
+execute_process(COMMAND ${CLANG_TOOL} --version OUTPUT_VARIABLE CLANG_TOOL_VERSION ERROR_VARIABLE CLANG_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CLANG_TOOL_VERSION "${CLANG_TOOL_VERSION}")
+message(STATUS "🔖 Clang ${CLANG_TOOL_VERSION} (${CLANG_TOOL})")
+
+find_program(CLANG_TIDY_TOOL NAMES clang-tidy-20 clang-tidy-19 clang-tidy-18 clang-tidy-17 clang-tidy-16 clang-tidy-15 clang-tidy-14 clang-tidy-13 clang-tidy-12 clang-tidy-11 clang-tidy)
+execute_process(COMMAND ${CLANG_TIDY_TOOL} --version OUTPUT_VARIABLE CLANG_TIDY_TOOL_VERSION ERROR_VARIABLE CLANG_TIDY_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CLANG_TIDY_TOOL_VERSION "${CLANG_TIDY_TOOL_VERSION}")
+message(STATUS "🔖 Clang-Tidy ${CLANG_TIDY_TOOL_VERSION} (${CLANG_TIDY_TOOL})")
+
+message(STATUS "🔖 CMake ${CMAKE_VERSION} (${CMAKE_COMMAND})")
+
+find_program(GCC_TOOL NAMES g++-latest g++-HEAD g++ g++-15 g++-14 g++-13 g++-12 g++-11 g++-10)
+execute_process(COMMAND ${GCC_TOOL} --version OUTPUT_VARIABLE GCC_TOOL_VERSION ERROR_VARIABLE GCC_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCC_TOOL_VERSION "${GCC_TOOL_VERSION}")
+message(STATUS "🔖 GCC ${GCC_TOOL_VERSION} (${GCC_TOOL})")
+
+find_program(GCOV_TOOL NAMES gcov-HEAD gcov gcov-15 gcov-14 gcov-13 gcov-12 gcov-11 gcov-10)
+execute_process(COMMAND ${GCOV_TOOL} --version OUTPUT_VARIABLE GCOV_TOOL_VERSION ERROR_VARIABLE GCOV_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCOV_TOOL_VERSION "${GCOV_TOOL_VERSION}")
+message(STATUS "🔖 GCOV ${GCOV_TOOL_VERSION} (${GCOV_TOOL})")
+
+find_program(GIT_TOOL NAMES git)
+execute_process(COMMAND ${GIT_TOOL} --version OUTPUT_VARIABLE GIT_TOOL_VERSION ERROR_VARIABLE GIT_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GIT_TOOL_VERSION "${GIT_TOOL_VERSION}")
+message(STATUS "🔖 Git ${GIT_TOOL_VERSION} (${GIT_TOOL})")
+
+find_program(IWYU_TOOL NAMES include-what-you-use iwyu)
+execute_process(COMMAND ${IWYU_TOOL} --version OUTPUT_VARIABLE IWYU_TOOL_VERSION ERROR_VARIABLE IWYU_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" IWYU_TOOL_VERSION "${IWYU_TOOL_VERSION}")
+message(STATUS "🔖 include-what-you-use ${IWYU_TOOL_VERSION} (${IWYU_TOOL})")
+
+find_program(INFER_TOOL NAMES infer)
+execute_process(COMMAND ${INFER_TOOL} --version OUTPUT_VARIABLE INFER_TOOL_VERSION ERROR_VARIABLE INFER_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" INFER_TOOL_VERSION "${INFER_TOOL_VERSION}")
+message(STATUS "🔖 Infer ${INFER_TOOL_VERSION} (${INFER_TOOL})")
+
+find_program(LCOV_TOOL NAMES lcov)
+execute_process(COMMAND ${LCOV_TOOL} --version OUTPUT_VARIABLE LCOV_TOOL_VERSION ERROR_VARIABLE LCOV_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" LCOV_TOOL_VERSION "${LCOV_TOOL_VERSION}")
+message(STATUS "🔖 LCOV ${LCOV_TOOL_VERSION} (${LCOV_TOOL})")
+
+find_program(NINJA_TOOL NAMES ninja)
+execute_process(COMMAND ${NINJA_TOOL} --version OUTPUT_VARIABLE NINJA_TOOL_VERSION ERROR_VARIABLE NINJA_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" NINJA_TOOL_VERSION "${NINJA_TOOL_VERSION}")
+message(STATUS "🔖 Ninja ${NINJA_TOOL_VERSION} (${NINJA_TOOL})")
+
+find_program(OCLINT_TOOL NAMES oclint-json-compilation-database)
+find_program(OCLINT_VERSION_TOOL NAMES oclint)
+execute_process(COMMAND ${OCLINT_VERSION_TOOL} --version OUTPUT_VARIABLE OCLINT_TOOL_VERSION ERROR_VARIABLE OCLINT_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" OCLINT_TOOL_VERSION "${OCLINT_TOOL_VERSION}")
+message(STATUS "🔖 OCLint ${OCLINT_TOOL_VERSION} (${OCLINT_TOOL})")
+
+find_program(VALGRIND_TOOL NAMES valgrind)
+execute_process(COMMAND ${VALGRIND_TOOL} --version OUTPUT_VARIABLE VALGRIND_TOOL_VERSION ERROR_VARIABLE VALGRIND_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" VALGRIND_TOOL_VERSION "${VALGRIND_TOOL_VERSION}")
+message(STATUS "🔖 Valgrind ${VALGRIND_TOOL_VERSION} (${VALGRIND_TOOL})")
+
+find_program(GENHTML_TOOL NAMES genhtml)
+find_program(PLOG_CONVERTER_TOOL NAMES plog-converter)
+find_program(PVS_STUDIO_ANALYZER_TOOL NAMES pvs-studio-analyzer)
+find_program(SCAN_BUILD_TOOL NAMES scan-build-15 scan-build-14 scan-build-13 scan-build-12 scan-build-11 scan-build)
+
+# the individual source files
+file(GLOB_RECURSE SRC_FILES ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp)
+
+###############################################################################
+# Thorough check with recent compilers
+###############################################################################
+
+include(clang_flags)
+include(gcc_flags)
+
+add_custom_target(ci_test_gcc
+    COMMAND CXX=${GCC_TOOL} CXXFLAGS="${GCC_CXXFLAGS}" ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_gcc
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_gcc
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_gcc && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with GCC using maximal warning flags"
+)
+
+add_custom_target(ci_test_clang
+    COMMAND CXX=${CLANG_TOOL} CXXFLAGS="${CLANG_CXXFLAGS}" ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with Clang using maximal warning flags"
+)
+
+###############################################################################
+# Different C++ Standards.
+###############################################################################
+
+foreach(CXX_STANDARD 11 14 17 20 23 26)
+    add_custom_target(ci_test_gcc_cxx${CXX_STANDARD}
+        COMMAND CXX=${GCC_TOOL} CXXFLAGS="${GCC_CXXFLAGS}" ${CMAKE_COMMAND}
+            -DCMAKE_BUILD_TYPE=Debug -GNinja
+            -DJSON_BuildTests=ON -DJSON_FastTests=ON
+            -DJSON_TestStandards=${CXX_STANDARD}
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD}
+        COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+        COMMENT "Compile and test with GCC for C++${CXX_STANDARD}"
+    )
+
+    add_custom_target(ci_test_clang_cxx${CXX_STANDARD}
+        COMMAND CXX=${CLANG_TOOL} CXXFLAGS="${CLANG_CXXFLAGS}" ${CMAKE_COMMAND}
+            -DCMAKE_BUILD_TYPE=Debug -GNinja
+            -DJSON_BuildTests=ON -DJSON_FastTests=ON
+            -DJSON_TestStandards=${CXX_STANDARD}
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+        COMMENT "Compile and test with Clang for C++${CXX_STANDARD}"
+    )
+
+    add_custom_target(ci_test_clang_libcxx_cxx${CXX_STANDARD}
+        COMMAND CXX=${CLANG_TOOL} CXXFLAGS="${CLANG_CXXFLAGS}" ${CMAKE_COMMAND}
+            -DCMAKE_BUILD_TYPE=Debug -GNinja
+            -DJSON_BuildTests=ON -DJSON_FastTests=ON
+            -DJSON_TestStandards=${CXX_STANDARD}
+            -DCMAKE_CXX_FLAGS="-stdlib=libc++"
+            -DCMAKE_EXE_LINKER_FLAGS="-lc++abi"
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+        COMMENT "Compile and test with Clang for C++${CXX_STANDARD} (libc++)"
+    )
+endforeach()
+
+###############################################################################
+# Disable exceptions.
+###############################################################################
+
+add_custom_target(ci_test_noexceptions
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DCMAKE_CXX_FLAGS=-DJSON_NOEXCEPTION -DDOCTEST_TEST_FILTER=--no-throw
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noexceptions
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_noexceptions
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_noexceptions && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with exceptions switched off"
+)
+
+###############################################################################
+# Disable implicit conversions.
+###############################################################################
+
+add_custom_target(ci_test_noimplicitconversions
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_ImplicitConversions=OFF
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noimplicitconversions
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_noimplicitconversions
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_noimplicitconversions && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with implicit conversions switched off"
+)
+
+###############################################################################
+# Enable improved diagnostics.
+###############################################################################
+
+add_custom_target(ci_test_diagnostics
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_Diagnostics=ON
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_diagnostics
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_diagnostics
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_diagnostics && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with improved diagnostics enabled"
+)
+
+###############################################################################
+# Enable diagnostic positions support.
+###############################################################################
+
+add_custom_target(ci_test_diagnostic_positions
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_Diagnostic_Positions=ON
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_diagnostic_positions
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_diagnostic_positions
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_diagnostic_positions && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with diagnostic positions enabled"
+)
+
+###############################################################################
+# Enable legacy discarded value comparison.
+###############################################################################
+
+add_custom_target(ci_test_legacycomparison
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_LegacyDiscardedValueComparison=ON
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_legacycomparison
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_legacycomparison
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_legacycomparison && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with legacy discarded value comparison enabled"
+)
+
+###############################################################################
+# Disable global UDLs.
+###############################################################################
+
+add_custom_target(ci_test_noglobaludls
+    COMMAND ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_FastTests=ON -DJSON_GlobalUDLs=OFF
+    -DCMAKE_CXX_FLAGS=-DJSON_TEST_NO_GLOBAL_UDLS
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noglobaludls
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_noglobaludls
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_noglobaludls && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with global UDLs disabled"
+)
+
+###############################################################################
+# Coverage.
+###############################################################################
+
+add_custom_target(ci_test_coverage
+    COMMAND CXX=g++ ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja -DCMAKE_CXX_FLAGS="--coverage;-fprofile-arcs;-ftest-coverage"
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_coverage
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_coverage
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_coverage && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+
+    COMMAND CXX=g++ ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja -DCMAKE_CXX_FLAGS="-m32;--coverage;-fprofile-arcs;-ftest-coverage"
+        -DJSON_BuildTests=ON -DJSON_32bitTest=ONLY
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_coverage32
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_coverage32
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_coverage32 && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+
+    COMMAND ${LCOV_TOOL} --directory . --capture --output-file json.info --rc branch_coverage=1 --rc geninfo_unexecuted_blocks=1 --ignore-errors mismatch --ignore-errors unused
+    COMMAND ${LCOV_TOOL} -e json.info ${SRC_FILES} --output-file json.info.filtered --rc branch_coverage=1 --ignore-errors unused
+    COMMAND ${CMAKE_SOURCE_DIR}/tests/thirdparty/imapdl/filterbr.py json.info.filtered > json.info.filtered.noexcept
+    COMMAND genhtml --title "JSON for Modern C++" --legend --demangle-cpp --output-directory html --show-details --branch-coverage json.info.filtered.noexcept
+
+    COMMENT "Compile and test with coverage"
+)
+
+###############################################################################
+# Sanitizers.
+###############################################################################
+
+set(CLANG_CXX_FLAGS_SANITIZER "-g -O1 -fsanitize=address -fsanitize=undefined -fsanitize=integer -fsanitize=nullability -fno-omit-frame-pointer -fno-sanitize-recover=all -fno-sanitize=unsigned-integer-overflow -fno-sanitize=unsigned-shift-base")
+
+add_custom_target(ci_test_clang_sanitizer
+    COMMAND CXX=${CLANG_TOOL} CXXFLAGS=${CLANG_CXX_FLAGS_SANITIZER} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_sanitizer
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_sanitizer
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_sanitizer && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with sanitizers"
+)
+
+###############################################################################
+# Check if header is amalgamated and sources are properly indented.
+###############################################################################
+
+file(GLOB_RECURSE INDENT_FILES
+    ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp
+        ${PROJECT_SOURCE_DIR}/tests/src/*.cpp
+        ${PROJECT_SOURCE_DIR}/tests/src/*.hpp
+        ${PROJECT_SOURCE_DIR}/tests/benchmarks/src/benchmarks.cpp
+    ${PROJECT_SOURCE_DIR}/docs/examples/*.cpp
+)
+
+set(include_dir ${PROJECT_SOURCE_DIR}/single_include/nlohmann)
+set(tool_dir ${PROJECT_SOURCE_DIR}/tools/amalgamate)
+add_custom_target(ci_test_amalgamation
+    COMMAND rm -fr ${include_dir}/json.hpp~ ${include_dir}/json_fwd.hpp~
+    COMMAND cp ${include_dir}/json.hpp ${include_dir}/json.hpp~
+    COMMAND cp ${include_dir}/json_fwd.hpp ${include_dir}/json_fwd.hpp~
+
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv_astyle
+    COMMAND venv_astyle/bin/pip3 --quiet install -r ${CMAKE_SOURCE_DIR}/tools/astyle/requirements.txt
+    COMMAND venv_astyle/bin/astyle --version
+
+    COMMAND ${Python3_EXECUTABLE} ${tool_dir}/amalgamate.py -c ${tool_dir}/config_json.json -s .
+    COMMAND ${Python3_EXECUTABLE} ${tool_dir}/amalgamate.py -c ${tool_dir}/config_json_fwd.json -s .
+    COMMAND venv_astyle/bin/astyle --project=tools/astyle/.astylerc --suffix=none ${include_dir}/json.hpp ${include_dir}/json_fwd.hpp
+
+    COMMAND diff ${include_dir}/json.hpp~ ${include_dir}/json.hpp
+    COMMAND diff ${include_dir}/json_fwd.hpp~ ${include_dir}/json_fwd.hpp
+
+    COMMAND venv_astyle/bin/astyle --project=tools/astyle/.astylerc --suffix=orig ${INDENT_FILES}
+    COMMAND for FILE in `find . -name '*.orig'`\; do false \; done
+
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    COMMENT "Check amalgamation and indentation"
+)
+
+###############################################################################
+# Build and test using the amalgamated header
+###############################################################################
+
+add_custom_target(ci_test_single_header
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=OFF -DJSON_FastTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_single_header
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_single_header
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_single_header && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test single-header version"
+)
+
+###############################################################################
+# Valgrind.
+###############################################################################
+
+add_custom_target(ci_test_valgrind
+    COMMAND CXX=${GCC_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_Valgrind=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_valgrind
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_valgrind
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_valgrind && ${CMAKE_CTEST_COMMAND} -L valgrind --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with Valgrind"
+)
+
+###############################################################################
+# Check code with Clang Static Analyzer.
+###############################################################################
+
+set(CLANG_ANALYZER_CHECKS "fuchsia.HandleChecker,nullability.NullableDereferenced,nullability.NullablePassedToNonnull,nullability.NullableReturnedFromNonnull,optin.cplusplus.UninitializedObject,optin.cplusplus.VirtualCall,optin.mpi.MPI-Checker,optin.osx.OSObjectCStyleCast,optin.osx.cocoa.localizability.EmptyLocalizationContextChecker,optin.osx.cocoa.localizability.NonLocalizedStringChecker,optin.performance.GCDAntipattern,optin.performance.Padding,optin.portability.UnixAPI,security.FloatLoopCounter,security.insecureAPI.DeprecatedOrUnsafeBufferHandling,security.insecureAPI.bcmp,security.insecureAPI.bcopy,security.insecureAPI.bzero,security.insecureAPI.rand,security.insecureAPI.strcpy,valist.CopyToSelf,valist.Uninitialized,valist.Unterminated,webkit.NoUncountedMemberChecker,webkit.RefCntblBaseVirtualDtor,core.CallAndMessage,core.DivideZero,core.NonNullParamChecker,core.NullDereference,core.StackAddressEscape,core.UndefinedBinaryOperatorResult,core.VLASize,core.uninitialized.ArraySubscript,core.uninitialized.Assign,core.uninitialized.Branch,core.uninitialized.CapturedBlockVariable,core.uninitialized.UndefReturn,cplusplus.InnerPointer,cplusplus.Move,cplusplus.NewDelete,cplusplus.NewDeleteLeaks,cplusplus.PlacementNew,cplusplus.PureVirtualCall,deadcode.DeadStores,nullability.NullPassedToNonnull,nullability.NullReturnedFromNonnull,osx.API,osx.MIG,osx.NumberObjectConversion,osx.OSObjectRetainCount,osx.ObjCProperty,osx.SecKeychainAPI,osx.cocoa.AtSync,osx.cocoa.AutoreleaseWrite,osx.cocoa.ClassRelease,osx.cocoa.Dealloc,osx.cocoa.IncompatibleMethodTypes,osx.cocoa.Loops,osx.cocoa.MissingSuperCall,osx.cocoa.NSAutoreleasePool,osx.cocoa.NSError,osx.cocoa.NilArg,osx.cocoa.NonNilReturnValue,osx.cocoa.ObjCGenerics,osx.cocoa.RetainCount,osx.cocoa.RunLoopAutoreleaseLeak,osx.cocoa.SelfInit,osx.cocoa.SuperDealloc,osx.cocoa.UnusedIvars,osx.cocoa.VariadicMethodTypes,osx.coreFoundation.CFError,osx.coreFoundation.CFNumber,osx.coreFoundation.CFRetainRelease,osx.coreFoundation.containers.OutOfBounds,osx.coreFoundation.containers.PointerSizedValues,security.insecureAPI.UncheckedReturn,security.insecureAPI.decodeValueOfObjCType,security.insecureAPI.getpw,security.insecureAPI.gets,security.insecureAPI.mkstemp,security.insecureAPI.mktemp,security.insecureAPI.vfork,unix.API,unix.Malloc,unix.MallocSizeof,unix.MismatchedDeallocator,unix.Vfork,unix.cstring.BadSizeArg,unix.cstring.NullArg")
+
+add_custom_target(ci_clang_analyze
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_analyze
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_analyze && ${SCAN_BUILD_TOOL} -enable-checker ${CLANG_ANALYZER_CHECKS} --use-c++=${CLANG_TOOL} -analyze-headers -o ${PROJECT_BINARY_DIR}/report ninja
+    COMMENT "Check code with Clang Analyzer"
+)
+
+###############################################################################
+# Check code with Cppcheck.
+###############################################################################
+
+add_custom_target(ci_cppcheck
+    COMMAND mkdir -p cppcheck
+    COMMAND clang -dM -E -x c++ -std=c++11 ${CMAKE_SOURCE_DIR}/include/nlohmann/thirdparty/hedley/hedley.hpp > default_defines.hpp 2> /dev/null
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv_cppcheck
+    COMMAND venv_cppcheck/bin/pip3 --quiet install -r ${CMAKE_SOURCE_DIR}/cmake/requirements/requirements-cppcheck.txt
+    COMMAND venv_cppcheck/bin/cppcheck --enable=warning --check-level=exhaustive --inline-suppr --inconclusive --force
+            --std=c++11 ${PROJECT_SOURCE_DIR}/include/nlohmann/json.hpp -I ${CMAKE_SOURCE_DIR}/include
+            --error-exitcode=1 --relative-paths=${PROJECT_SOURCE_DIR} -j ${N} --include=default_defines.hpp
+            --cppcheck-build-dir=cppcheck --check-level=exhaustive
+            -UJSON_CATCH_USER -UJSON_TRY_USER -UJSON_ASSERT -UJSON_INTERNAL_CATCH -UJSON_THROW
+            -DJSON_HAS_CPP_11 -UJSON_HAS_CPP_14 -UJSON_HAS_CPP_17 -UJSON_HAS_CPP_20 -UJSON_HAS_THREE_WAY_COMPARISON
+    COMMENT "Check code with Cppcheck"
+)
+
+###############################################################################
+# Check code with cpplint.
+###############################################################################
+
+add_custom_target(ci_cpplint
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv_cpplint
+    COMMAND venv_cpplint/bin/pip3 --quiet install -r ${CMAKE_SOURCE_DIR}/cmake/requirements/requirements-cpplint.txt
+    COMMAND venv_cpplint/bin/cpplint --filter=-whitespace,-legal,-runtime/references,-runtime/explicit,-runtime/indentation_namespace,-readability/casting,-readability/nolint --quiet --recursive ${SRC_FILES}
+    COMMENT "Check code with cpplint"
+    WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+)
+
+###############################################################################
+# Check code with OCLint.
+###############################################################################
+
+file(COPY ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp DESTINATION ${PROJECT_BINARY_DIR}/src_single)
+file(RENAME ${PROJECT_BINARY_DIR}/src_single/json.hpp ${PROJECT_BINARY_DIR}/src_single/all.cpp)
+file(APPEND "${PROJECT_BINARY_DIR}/src_single/all.cpp" "\n\nint main()\n{}\n")
+
+add_executable(single_all ${PROJECT_BINARY_DIR}/src_single/all.cpp)
+target_compile_features(single_all PRIVATE cxx_std_11)
+
+add_custom_target(ci_oclint
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        -DJSON_BuildTests=OFF -DJSON_CI=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_oclint
+    COMMAND ${OCLINT_TOOL} -i ${PROJECT_BINARY_DIR}/build_oclint/src_single/all.cpp -p ${PROJECT_BINARY_DIR}/build_oclint --
+        -report-type html -enable-global-analysis --max-priority-1=0 --max-priority-2=1000 --max-priority-3=2000
+        --disable-rule=MultipleUnaryOperator
+        --disable-rule=DoubleNegative
+        --disable-rule=ShortVariableName
+        --disable-rule=GotoStatement
+        --disable-rule=LongLine
+        -o ${PROJECT_BINARY_DIR}/build_oclint/oclint_report.html
+    COMMENT "Check code with OCLint"
+)
+
+###############################################################################
+# Check code with Clang-Tidy.
+###############################################################################
+
+add_custom_target(ci_clang_tidy
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_CLANG_TIDY=${CLANG_TIDY_TOOL}
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_tidy
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_tidy
+    COMMENT "Check code with Clang-Tidy"
+)
+
+###############################################################################
+# Check code with PVS-Studio Analyzer <https://www.viva64.com/en/pvs-studio/>.
+###############################################################################
+
+add_custom_target(ci_pvs_studio
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_pvs_studio
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_pvs_studio && ${PVS_STUDIO_ANALYZER_TOOL} analyze -j 10
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_pvs_studio && ${PLOG_CONVERTER_TOOL} -a'GA:1,2;64:1;CS' -t fullhtml PVS-Studio.log -o pvs
+    COMMENT "Check code with PVS Studio"
+)
+
+###############################################################################
+# Check code with Infer <https://fbinfer.com> static analyzer.
+###############################################################################
+
+add_custom_target(ci_infer
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_infer
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_infer && ${INFER_TOOL} compile -- ${CMAKE_COMMAND} -DCMAKE_BUILD_TYPE=Debug ${PROJECT_SOURCE_DIR} -DJSON_BuildTests=ON
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_infer && ${INFER_TOOL} run -- make
+    COMMENT "Check code with Infer"
+)
+
+###############################################################################
+# Run test suite with previously downloaded test data.
+###############################################################################
+
+add_custom_target(ci_offline_testdata
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data && ${GIT_TOOL} clone -c advice.detachedHead=false --branch v3.1.0 https://github.com/nlohmann/json_test_data.git --quiet --depth 1
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON -DJSON_TestDataDirectory=${PROJECT_BINARY_DIR}/build_offline_testdata/test_data/json_test_data
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_offline_testdata
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_offline_testdata
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_offline_testdata && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Check code with previously downloaded test data"
+)
+
+###############################################################################
+# Run test suite when project was not checked out from Git
+###############################################################################
+
+add_custom_target(ci_non_git_tests
+    COMMAND git config --global --add safe.directory ${PROJECT_SOURCE_DIR}
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_non_git_tests/sources
+    COMMAND cd ${PROJECT_SOURCE_DIR} && for FILE in `${GIT_TOOL} ls-tree --name-only HEAD`\; do cp -r $$FILE ${PROJECT_BINARY_DIR}/build_non_git_tests/sources \; done
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_BINARY_DIR}/build_non_git_tests/sources -B${PROJECT_BINARY_DIR}/build_non_git_tests
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_non_git_tests
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_non_git_tests && ${CMAKE_CTEST_COMMAND} --parallel ${N} -LE git_required --output-on-failure
+    COMMENT "Check code when project was not checked out from Git"
+)
+
+###############################################################################
+# Run test suite and exclude tests that change installed files
+###############################################################################
+
+add_custom_target(ci_reproducible_tests
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_reproducible_tests
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_reproducible_tests
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_reproducible_tests && ${CMAKE_CTEST_COMMAND} --parallel ${N} -LE not_reproducible --output-on-failure
+    COMMENT "Check code and exclude tests that change installed files"
+)
+
+###############################################################################
+# Check if every header in the include folder includes sufficient headers to
+# be compiled individually.
+###############################################################################
+
+set(iwyu_path_and_options ${IWYU_TOOL} -Xiwyu --max_line_length=300)
+
+foreach(SRC_FILE ${SRC_FILES})
+    # get relative path of the header file
+    file(RELATIVE_PATH RELATIVE_SRC_FILE "${PROJECT_SOURCE_DIR}/include/nlohmann" "${SRC_FILE}")
+    # replace slashes and strip suffix
+    string(REPLACE "/" "_" RELATIVE_SRC_FILE "${RELATIVE_SRC_FILE}")
+    string(REPLACE ".hpp" "" RELATIVE_SRC_FILE "${RELATIVE_SRC_FILE}")
+    # create code file
+    file(WRITE "${PROJECT_BINARY_DIR}/src_single/${RELATIVE_SRC_FILE}.cpp" "#include \"${SRC_FILE}\" // IWYU pragma: keep\n\nint main()\n{}\n")
+    # create executable
+    add_executable(single_${RELATIVE_SRC_FILE} EXCLUDE_FROM_ALL ${PROJECT_BINARY_DIR}/src_single/${RELATIVE_SRC_FILE}.cpp)
+    target_include_directories(single_${RELATIVE_SRC_FILE} PRIVATE ${PROJECT_SOURCE_DIR}/include)
+    target_compile_features(single_${RELATIVE_SRC_FILE} PRIVATE cxx_std_11)
+    set_property(TARGET single_${RELATIVE_SRC_FILE} PROPERTY CXX_INCLUDE_WHAT_YOU_USE "${iwyu_path_and_options}")
+    # remember binary for ci_single_binaries target
+    list(APPEND single_binaries single_${RELATIVE_SRC_FILE})
+endforeach()
+
+add_custom_target(ci_single_binaries
+    DEPENDS ${single_binaries}
+    COMMENT "Check if headers are self-contained"
+)
+
+###############################################################################
+# Benchmarks
+###############################################################################
+
+add_custom_target(ci_benchmarks
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Release -GNinja
+        -S${PROJECT_SOURCE_DIR}/benchmarks -B${PROJECT_BINARY_DIR}/build_benchmarks
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_benchmarks --target json_benchmarks
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_benchmarks && ./json_benchmarks
+    COMMENT "Run benchmarks"
+)
+
+###############################################################################
+# CMake flags
+###############################################################################
+
+# we test the project with different CMake versions:
+# - CMake 3.5 (the earliest supported)
+# - CMake 3.31.6 (the latest 3.x release)
+# - CMake 4.0.0 (the latest release)
+
+function(ci_get_cmake version var)
+    set(${var} ${PROJECT_BINARY_DIR}/cmake-${version}/bin/cmake)
+    add_custom_command(
+        OUTPUT ${${var}}
+        COMMAND wget -nc https://github.com/Kitware/CMake/releases/download/v${version}/cmake-${version}.tar.gz
+        COMMAND tar xfz cmake-${version}.tar.gz
+        COMMAND rm cmake-${version}.tar.gz
+        # -DCMAKE_POLICY_VERSION_MINIMUM=3.5 required to compile older CMake versions with CMake 4.0.0
+        COMMAND cmake -S cmake-${version} -B cmake-${version} -DCMAKE_POLICY_VERSION_MINIMUM=3.5
+        COMMAND cmake --build cmake-${version} --parallel 10
+        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+        COMMENT "Download CMake ${version}"
+    )
+    set(${var} ${${var}} PARENT_SCOPE)
+endfunction()
+
+ci_get_cmake(3.5.0  CMAKE_3_5_0_BINARY)
+ci_get_cmake(3.31.6 CMAKE_3_31_6_BINARY)
+ci_get_cmake(4.0.0  CMAKE_4_0_0_BINARY)
+
+# the tests require CMake 3.13 or later, so they are excluded for CMake 3.5.0
+set(JSON_CMAKE_FLAGS_3_5_0 JSON_Diagnostics JSON_Diagnostic_Positions JSON_GlobalUDLs JSON_ImplicitConversions JSON_DisableEnumSerialization
+    JSON_LegacyDiscardedValueComparison JSON_Install JSON_MultipleHeaders JSON_SystemInclude JSON_Valgrind)
+set(JSON_CMAKE_FLAGS_3_31_6 JSON_BuildTests ${JSON_CMAKE_FLAGS_3_31_6})
+set(JSON_CMAKE_FLAGS_4_0_0 JSON_BuildTests ${JSON_CMAKE_FLAGS_3_5_0})
+
+function(ci_add_cmake_flags_targets flag min_version)
+    string(TOLOWER "ci_cmake_flag_${flag}" flag_target)
+    string(REPLACE . _ min_version_var ${min_version})
+    set(cmake_binary ${CMAKE_${min_version_var}_BINARY})
+    add_custom_target(${flag_target}_${min_version}_2
+        COMMENT "Check CMake flag ${flag} (CMake ${CMAKE_VERSION})"
+        COMMAND ${CMAKE_COMMAND}
+            -Werror=dev
+            -D${flag}=ON
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_${flag_target}
+    )
+    add_custom_target(${flag_target}_${min_version_var}
+        COMMENT "Check CMake flag ${JSON_CMAKE_FLAG} (CMake ${min_version})"
+        COMMAND mkdir -pv ${PROJECT_BINARY_DIR}/build_${flag_target}_${min_version_var}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_${flag_target}_${min_version_var}
+            && ${cmake_binary} -Werror=dev ${PROJECT_SOURCE_DIR} -D${flag}=ON
+        DEPENDS ${cmake_binary}
+    )
+    list(APPEND JSON_CMAKE_FLAG_TARGETS ${JSON_CMAKE_FLAG_TARGET} ${flag_target}_${min_version_var})
+    list(APPEND JSON_CMAKE_FLAG_BUILD_DIRS ${PROJECT_BINARY_DIR}/build_${flag_target} ${PROJECT_BINARY_DIR}/build_${flag_target}_${min_version_var})
+    set(JSON_CMAKE_FLAG_TARGETS ${JSON_CMAKE_FLAG_TARGETS} PARENT_SCOPE)
+    set(JSON_CMAKE_FLAG_BUILD_DIRS ${JSON_CMAKE_FLAG_BUILD_DIRS} PARENT_SCOPE)
+endfunction()
+
+foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS_3_5_0})
+    ci_add_cmake_flags_targets(${JSON_CMAKE_FLAG} 3.5.0)
+endforeach()
+
+foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS_3_31_6})
+    ci_add_cmake_flags_targets(${JSON_CMAKE_FLAG} 3.31.6)
+endforeach()
+
+foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS_4_0_0})
+    ci_add_cmake_flags_targets(${JSON_CMAKE_FLAG} 4.0.0)
+endforeach()
+
+add_custom_target(ci_cmake_flags
+    DEPENDS ${JSON_CMAKE_FLAG_TARGETS}
+    COMMENT "Check CMake flags"
+)
+
+###############################################################################
+# Use more installed compilers.
+###############################################################################
+
+foreach(COMPILER g++-4.8 g++-4.9 g++-5 g++-6 g++-7 g++-8 g++-9 g++-10 g++-11 clang++-3.5 clang++-3.6 clang++-3.7 clang++-3.8 clang++-3.9 clang++-4.0 clang++-5.0 clang++-6.0 clang++-7 clang++-8 clang++-9 clang++-10 clang++-11 clang++-12 clang++-13 clang++-14 clang++-15 clang++-16 clang++-17 clang++-18 clang++-19 clang++-20)
+    find_program(COMPILER_TOOL NAMES ${COMPILER})
+    if (COMPILER_TOOL)
+        unset(ADDITIONAL_FLAGS)
+
+        add_custom_target(ci_test_compiler_${COMPILER}
+            COMMAND CXX=${COMPILER} ${CMAKE_COMMAND}
+                -DCMAKE_BUILD_TYPE=Debug -GNinja
+                -DJSON_BuildTests=ON -DJSON_FastTests=ON
+                -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_compiler_${COMPILER}
+                ${ADDITIONAL_FLAGS}
+            COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_compiler_${COMPILER}
+            COMMAND cd ${PROJECT_BINARY_DIR}/build_compiler_${COMPILER} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --exclude-regex "test-unicode" --output-on-failure
+            COMMENT "Compile and test with ${COMPILER}"
+        )
+    endif()
+    unset(COMPILER_TOOL CACHE)
+endforeach()
+
+add_custom_target(ci_test_compiler_default
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_compiler_default
+        ${ADDITIONAL_FLAGS}
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_compiler_default --parallel ${N}
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_compiler_default && ${CMAKE_CTEST_COMMAND} --parallel ${N} --exclude-regex "test-unicode" -LE git_required --output-on-failure
+    COMMENT "Compile and test with default C++ compiler"
+)
+
+###############################################################################
+# CUDA example
+###############################################################################
+
+add_custom_target(ci_cuda_example
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_CUDA_HOST_COMPILER=g++-8
+        -S${PROJECT_SOURCE_DIR}/tests/cuda_example -B${PROJECT_BINARY_DIR}/build_cuda_example
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_cuda_example
+)
+
+###############################################################################
+# C++ 20 modules
+###############################################################################
+
+add_custom_target(ci_module_cpp20
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja 
+        -DJSON_CI=ON -DNLOHMANN_JSON_BUILD_MODULES=ON -DJSON_Install=ON
+        -S${PROJECT_SOURCE_DIR}/tests/module_cpp20 -B${PROJECT_BINARY_DIR}/ci_module_cpp20
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/ci_module_cpp20
+)
+
+###############################################################################
+# Intel C++ Compiler
+###############################################################################
+
+add_custom_target(ci_icpc
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_C_COMPILER=icc -DCMAKE_CXX_COMPILER=icpc
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_icpc
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_icpc
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_icpc && ${CMAKE_CTEST_COMMAND} --parallel ${N} --exclude-regex "test-unicode" --output-on-failure
+    COMMENT "Compile and test with ICPC"
+)
+
+###############################################################################
+# REUSE
+###############################################################################
+
+add_custom_target(ci_reuse_compliance
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv_reuse
+    COMMAND venv_reuse/bin/pip3 --quiet install -r ${PROJECT_SOURCE_DIR}/cmake/requirements/requirements-reuse.txt
+    COMMAND venv_reuse/bin/reuse --root ${PROJECT_SOURCE_DIR} lint
+    COMMENT "Check REUSE specification compliance"
+)
+
+###############################################################################
+# test documentation
+###############################################################################
+
+add_custom_target(ci_test_examples
+    COMMAND make CXX="${GCC_TOOL}" check_output_portable -j8
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/docs
+    COMMENT "Check that all examples compile and create the desired output"
+)
+
+add_custom_target(ci_test_build_documentation
+    COMMAND ${Python3_EXECUTABLE} -mvenv venv
+    COMMAND venv/bin/pip3 --quiet install -r requirements.txt
+    COMMAND make build
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/docs/mkdocs
+    COMMENT "Build the documentation"
+)
+
+###############################################################################
+# Clean up all generated files.
+###############################################################################
+
+add_custom_target(ci_clean
+    COMMAND rm -fr ${PROJECT_BINARY_DIR}/build_* cmake-3.5.0-Darwin64 ${JSON_CMAKE_FLAG_BUILD_DIRS} ${single_binaries}
+    COMMENT "Clean generated directories"
+)

cmake/clang_flags.cmake

@@ -0,0 +1,22 @@
+# Ignored Clang warnings:
+# -Wno-c++98-compat               The library targets C++11.
+# -Wno-c++98-compat-pedantic      The library targets C++11.
+# -Wno-deprecated-declarations    The library contains annotations for deprecated functions.
+# -Wno-extra-semi-stmt            The library uses assert which triggers this warning.
+# -Wno-padded                     We do not care about padding warnings.
+# -Wno-covered-switch-default     All switches list all cases and a default case.
+# -Wno-unsafe-buffer-usage        Otherwise Doctest would not compile.
+# -Wno-missing-noreturn           We found no way to silence this warning otherwise, see PR #4871
+
+set(CLANG_CXXFLAGS
+    -Werror
+    -Weverything
+    -Wno-c++98-compat
+    -Wno-c++98-compat-pedantic
+    -Wno-deprecated-declarations
+    -Wno-extra-semi-stmt
+    -Wno-padded
+    -Wno-covered-switch-default
+    -Wno-unsafe-buffer-usage
+    -Wno-missing-noreturn
+)

cmake/config.cmake.in

@@ -1,6 +1,15 @@
-@PACKAGE_INIT@
+include(FindPackageHandleStandardArgs)
+set(${CMAKE_FIND_PACKAGE_NAME}_CONFIG ${CMAKE_CURRENT_LIST_FILE})
+find_package_handle_standard_args(@PROJECT_NAME@ CONFIG_MODE)
 
-cmake_policy(PUSH)
-cmake_policy(SET CMP0024 OLD)
-include(${CMAKE_CURRENT_LIST_DIR}/@JSON_TARGETS_FILENAME@)
-cmake_policy(POP)
+if(NOT TARGET @PROJECT_NAME@::@NLOHMANN_JSON_TARGET_NAME@)
+    include("${CMAKE_CURRENT_LIST_DIR}/@NLOHMANN_JSON_TARGETS_EXPORT_NAME@.cmake")
+    if((NOT TARGET @NLOHMANN_JSON_TARGET_NAME@) AND
+       (NOT @PROJECT_NAME@_FIND_VERSION OR
+        @PROJECT_NAME@_FIND_VERSION VERSION_LESS 3.2.0))
+        add_library(@NLOHMANN_JSON_TARGET_NAME@ INTERFACE IMPORTED)
+        set_target_properties(@NLOHMANN_JSON_TARGET_NAME@ PROPERTIES
+            INTERFACE_LINK_LIBRARIES @PROJECT_NAME@::@NLOHMANN_JSON_TARGET_NAME@
+        )
+    endif()
+endif()

cmake/detect_libcpp_version.cpp

@@ -0,0 +1,31 @@
+/*
+ * Detect used C++ Standard Library
+ *
+ * This file is compiled and run via try_run in download_test_data.cmake.
+ */
+
+#include <cstdio>
+
+// see https://en.cppreference.com/w/cpp/header/ciso646
+#if __cplusplus >= 202002L
+    #include <version>
+#else
+    #include <ciso646>
+#endif
+
+int main()
+{
+#if defined(_LIBCPP_VERSION)
+    std::printf("LLVM C++ Standard Library (libc++), _LIBCPP_VERSION=%d", _LIBCPP_VERSION);
+#elif defined(__GLIBCXX__)
+    std::printf("GNU C++ Standard Library (libstdc++), __GLIBCXX__=%d", __GLIBCXX__);
+#elif defined(_MSVC_STL_VERSION)
+    std::printf("Microsoft C++ Standard Library (MSVC STL), _MSVC_STL_VERSION=%d", _MSVC_STL_VERSION);
+#elif defined(_LIBCUDACXX_VERSION)
+    std::printf("NVIDIA C++ Standard Library (libcudacxx), _LIBCUDACXX_VERSION=%d", _LIBCUDACXX_VERSION);
+#elif defined(EASTL_VERSION)
+    std::printf("Electronic Arts Standard Template Library (EASTL), EASTL_VERSION=%d", EASTL_VERSION);
+#else
+    std::printf("unknown");
+#endif
+}

cmake/download_test_data.cmake

@@ -0,0 +1,87 @@
+set(JSON_TEST_DATA_URL     https://github.com/nlohmann/json_test_data)
+set(JSON_TEST_DATA_VERSION 3.1.0)
+
+include(ExternalProject)
+
+# if variable is set, use test data from given directory rather than downloading them
+if(JSON_TestDataDirectory)
+    message(STATUS "Using test data in ${JSON_TestDataDirectory}.")
+    add_custom_target(download_test_data)
+    file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${JSON_TestDataDirectory}\"\n")
+else()
+    # create a header with the path to the downloaded test data
+    file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${CMAKE_BINARY_DIR}/test_files\"\n")
+
+    # download test data from GitHub release
+    ExternalProject_Add(download_test_data_project
+        URL "${JSON_TEST_DATA_URL}/archive/refs/tags/v${JSON_TEST_DATA_VERSION}.zip"
+        SOURCE_DIR "${CMAKE_BINARY_DIR}/test_files"
+        CONFIGURE_COMMAND ""
+        BUILD_COMMAND ""
+        INSTALL_COMMAND ""
+        LOG_DOWNLOAD TRUE
+        DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+        EXCLUDE_FROM_ALL TRUE
+    )
+
+    # target to download test data
+    add_custom_target(download_test_data
+        DEPENDS download_test_data_project
+    )
+endif()
+
+# determine the operating system (for debug and support purposes)
+find_program(UNAME_COMMAND uname)
+find_program(VER_COMMAND ver)
+find_program(LSB_RELEASE_COMMAND lsb_release)
+find_program(SW_VERS_COMMAND sw_vers)
+set(OS_VERSION_STRINGS "${CMAKE_SYSTEM}")
+if (VER_COMMAND)
+    execute_process(COMMAND ${VER_COMMAND} OUTPUT_VARIABLE VER_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${VER_COMMAND_RESULT}")
+endif()
+if (SW_VERS_COMMAND)
+    execute_process(COMMAND ${SW_VERS_COMMAND} OUTPUT_VARIABLE SW_VERS_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    string(REGEX REPLACE "[ ]*\n" "; " SW_VERS_COMMAND_RESULT "${SW_VERS_COMMAND_RESULT}")
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${SW_VERS_COMMAND_RESULT}")
+endif()
+if (LSB_RELEASE_COMMAND)
+    execute_process(COMMAND ${LSB_RELEASE_COMMAND} -a OUTPUT_VARIABLE LSB_RELEASE_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    string(REGEX REPLACE "[ ]*\n" "; " LSB_RELEASE_COMMAND_RESULT "${LSB_RELEASE_COMMAND_RESULT}")
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${LSB_RELEASE_COMMAND_RESULT}")
+endif()
+if (UNAME_COMMAND)
+    execute_process(COMMAND ${UNAME_COMMAND} -a OUTPUT_VARIABLE UNAME_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${UNAME_COMMAND_RESULT}")
+endif()
+
+message(STATUS "Operating system: ${OS_VERSION_STRINGS}")
+
+# determine the compiler (for debug and support purposes)
+if (MSVC)
+    execute_process(COMMAND ${CMAKE_CXX_COMPILER} OUTPUT_VARIABLE CXX_VERSION_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_VARIABLE CXX_VERSION_RESULT ERROR_STRIP_TRAILING_WHITESPACE)
+    set(CXX_VERSION_RESULT "${CXX_VERSION_RESULT}; MSVC_VERSION=${MSVC_VERSION}; MSVC_TOOLSET_VERSION=${MSVC_TOOLSET_VERSION}")
+else()
+    execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE CXX_VERSION_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
+string(REGEX REPLACE "[ ]*\n" "; " CXX_VERSION_RESULT "${CXX_VERSION_RESULT}")
+message(STATUS "Compiler: ${CXX_VERSION_RESULT}")
+
+# determine used C++ standard library (for debug and support purposes)
+if(CMAKE_CROSSCOMPILING)
+    set(LIBCPP_VERSION_OUTPUT_CACHED "could not be detected due to cross-compiling" CACHE STRING "Detected C++ standard library version")
+endif()
+if(NOT DEFINED LIBCPP_VERSION_OUTPUT_CACHED)
+    try_run(RUN_RESULT_VAR COMPILE_RESULT_VAR
+        "${CMAKE_BINARY_DIR}" SOURCES "${CMAKE_SOURCE_DIR}/cmake/detect_libcpp_version.cpp"
+        RUN_OUTPUT_VARIABLE LIBCPP_VERSION_OUTPUT
+        COMPILE_OUTPUT_VARIABLE LIBCPP_VERSION_COMPILE_OUTPUT
+    )
+    if(NOT LIBCPP_VERSION_OUTPUT)
+        set(LIBCPP_VERSION_OUTPUT "Unknown")
+        message(AUTHOR_WARNING "Failed to compile cmake/detect_libcpp_version to detect the used C++ standard library. This does not affect the library or the test cases. Please still create an issue at https://github.com/nlohmann/json to investigate this.\n${LIBCPP_VERSION_COMPILE_OUTPUT}")
+    endif()
+    set(LIBCPP_VERSION_OUTPUT_CACHED "${LIBCPP_VERSION_OUTPUT}" CACHE STRING "Detected C++ standard library version")
+endif()
+
+message(STATUS "C++ standard library: ${LIBCPP_VERSION_OUTPUT_CACHED}")

cmake/gcc_flags.cmake

@@ -0,0 +1,363 @@
+# Warning flags determined for GCC 15.1.0 with https://github.com/nlohmann/gcc_flags:
+# Ignored GCC warnings:
+# -Wno-abi-tag           We do not care about ABI tags.
+# -Wno-aggregate-return  The library uses aggregate returns.
+# -Wno-long-long         The library uses the long long type to interface with system functions.
+# -Wno-namespaces        The library uses namespaces.
+# -Wno-nrvo              Doctest triggers this warning.
+# -Wno-padded            We do not care about padding warnings.
+# -Wno-system-headers    We do not care about warnings in system headers.
+# -Wno-templates         The library uses templates.
+
+set(GCC_CXXFLAGS
+    -pedantic
+    -Werror
+    --all-warnings
+    --extra-warnings
+    -W
+    -WNSObject-attribute
+    -Wno-abi-tag
+    -Waddress
+    -Waddress-of-packed-member
+    -Wno-aggregate-return
+    -Waggressive-loop-optimizations
+    -Waligned-new=all
+    -Wall
+    -Walloc-size
+    -Walloc-zero
+    -Walloca
+    -Wanalyzer-allocation-size
+    -Wanalyzer-deref-before-check
+    -Wanalyzer-double-fclose
+    -Wanalyzer-double-free
+    -Wanalyzer-exposure-through-output-file
+    -Wanalyzer-exposure-through-uninit-copy
+    -Wanalyzer-fd-access-mode-mismatch
+    -Wanalyzer-fd-double-close
+    -Wanalyzer-fd-leak
+    -Wanalyzer-fd-phase-mismatch
+    -Wanalyzer-fd-type-mismatch
+    -Wanalyzer-fd-use-after-close
+    -Wanalyzer-fd-use-without-check
+    -Wanalyzer-file-leak
+    -Wanalyzer-free-of-non-heap
+    -Wanalyzer-imprecise-fp-arithmetic
+    -Wanalyzer-infinite-loop
+    -Wanalyzer-infinite-recursion
+    -Wanalyzer-jump-through-null
+    -Wanalyzer-malloc-leak
+    -Wanalyzer-mismatching-deallocation
+    -Wanalyzer-null-argument
+    -Wanalyzer-null-dereference
+    -Wanalyzer-out-of-bounds
+    -Wanalyzer-overlapping-buffers
+    -Wanalyzer-possible-null-argument
+    -Wanalyzer-possible-null-dereference
+    -Wanalyzer-putenv-of-auto-var
+    -Wanalyzer-shift-count-negative
+    -Wanalyzer-shift-count-overflow
+    -Wanalyzer-stale-setjmp-buffer
+    -Wanalyzer-symbol-too-complex
+    -Wanalyzer-tainted-allocation-size
+    -Wanalyzer-tainted-array-index
+    -Wanalyzer-tainted-assertion
+    -Wanalyzer-tainted-divisor
+    -Wanalyzer-tainted-offset
+    -Wanalyzer-tainted-size
+    -Wanalyzer-too-complex
+    -Wanalyzer-undefined-behavior-ptrdiff
+    -Wanalyzer-undefined-behavior-strtok
+    -Wanalyzer-unsafe-call-within-signal-handler
+    -Wanalyzer-use-after-free
+    -Wanalyzer-use-of-pointer-in-stale-stack-frame
+    -Wanalyzer-use-of-uninitialized-value
+    -Wanalyzer-va-arg-type-mismatch
+    -Wanalyzer-va-list-exhausted
+    -Wanalyzer-va-list-leak
+    -Wanalyzer-va-list-use-after-va-end
+    -Wanalyzer-write-to-const
+    -Wanalyzer-write-to-string-literal
+    -Warith-conversion
+    -Warray-bounds=2
+    -Warray-compare
+    -Warray-parameter=2
+    -Wattribute-alias=2
+    -Wattribute-warning
+    -Wattributes
+    -Wbool-compare
+    -Wbool-operation
+    -Wbuiltin-declaration-mismatch
+    -Wbuiltin-macro-redefined
+    -Wc++0x-compat
+    -Wc++11-compat
+    -Wc++11-extensions
+    -Wc++14-compat
+    -Wc++14-extensions
+    -Wc++17-compat
+    -Wc++17-extensions
+    -Wc++1z-compat
+    -Wc++20-compat
+    -Wc++20-extensions
+    -Wc++23-extensions
+    -Wc++26-extensions
+    -Wc++2a-compat
+    -Wcalloc-transposed-args
+    -Wcannot-profile
+    -Wcast-align
+    -Wcast-align=strict
+    -Wcast-function-type
+    -Wcast-qual
+    -Wcast-user-defined
+    -Wcatch-value=3
+    -Wchanges-meaning
+    -Wchar-subscripts
+    -Wclass-conversion
+    -Wclass-memaccess
+    -Wclobbered
+    -Wcomma-subscript
+    -Wcomment
+    -Wcomments
+    -Wcomplain-wrong-lang
+    -Wconditionally-supported
+    -Wconversion
+    -Wconversion-null
+    -Wcoverage-invalid-line-number
+    -Wcoverage-mismatch
+    -Wcoverage-too-many-conditions
+    -Wcoverage-too-many-paths
+    -Wcpp
+    -Wctad-maybe-unsupported
+    -Wctor-dtor-privacy
+    -Wdangling-else
+    -Wdangling-pointer=2
+    -Wdangling-reference
+    -Wdate-time
+    -Wdefaulted-function-deleted
+    -Wdelete-incomplete
+    -Wdelete-non-virtual-dtor
+    -Wdeprecated
+    -Wdeprecated-copy
+    -Wdeprecated-copy-dtor
+    -Wdeprecated-declarations
+    -Wdeprecated-enum-enum-conversion
+    -Wdeprecated-enum-float-conversion
+    -Wdeprecated-literal-operator
+    -Wdeprecated-variadic-comma-omission
+    -Wdisabled-optimization
+    -Wdiv-by-zero
+    -Wdouble-promotion
+    -Wduplicated-branches
+    -Wduplicated-cond
+    -Weffc++
+    -Welaborated-enum-base
+    -Wempty-body
+    -Wendif-labels
+    -Wenum-compare
+    -Wenum-conversion
+    -Wexceptions
+    -Wexpansion-to-defined
+    -Wextra
+    -Wextra-semi
+    -Wflex-array-member-not-at-end
+    -Wfloat-conversion
+    -Wfloat-equal
+    -Wformat -Wformat-contains-nul
+    -Wformat -Wformat-diag
+    -Wformat -Wformat-extra-args
+    -Wformat -Wformat-nonliteral
+    -Wformat -Wformat-overflow=2
+    -Wformat -Wformat-security
+    -Wformat -Wformat-signedness
+    -Wformat -Wformat-truncation=2
+    -Wformat -Wformat-y2k
+    -Wformat -Wformat-zero-length
+    -Wformat=2
+    -Wframe-address
+    -Wfree-nonheap-object
+    -Wglobal-module
+    -Whardened
+    -Wheader-guard
+    -Whsa
+    -Wif-not-aligned
+    -Wignored-attributes
+    -Wignored-qualifiers
+    -Wimplicit-fallthrough=5
+    -Winaccessible-base
+    -Winfinite-recursion
+    -Winherited-variadic-ctor
+    -Winit-list-lifetime
+    -Winit-self
+    -Winline
+    -Wint-in-bool-context
+    -Wint-to-pointer-cast
+    -Winterference-size
+    -Winvalid-constexpr
+    -Winvalid-imported-macros
+    -Winvalid-memory-model
+    -Winvalid-offsetof
+    -Winvalid-pch
+    -Winvalid-utf8
+    -Wliteral-suffix
+    -Wlogical-not-parentheses
+    -Wlogical-op
+    -Wno-long-long
+    -Wlto-type-mismatch
+    -Wmain
+    -Wmaybe-musttail-local-addr
+    -Wmaybe-uninitialized
+    -Wmemset-elt-size
+    -Wmemset-transposed-args
+    -Wmisleading-indentation
+    -Wmismatched-dealloc
+    -Wmismatched-new-delete
+    -Wmismatched-tags
+    -Wmissing-attributes
+    -Wmissing-braces
+    -Wmissing-declarations
+    -Wmissing-field-initializers
+    -Wmissing-include-dirs
+    -Wmissing-profile
+    -Wmissing-requires
+    -Wmissing-template-keyword
+    -Wmultichar
+    -Wmultiple-inheritance
+    -Wmultistatement-macros
+    -Wmusttail-local-addr
+    -Wno-namespaces
+    -Wnarrowing
+    -Wnoexcept
+    -Wnoexcept-type
+    -Wnon-template-friend
+    -Wnon-virtual-dtor
+    -Wnonnull
+    -Wnonnull-compare
+    -Wnormalized=nfkc
+    -Wno-nrvo
+    -Wnull-dereference
+    -Wodr
+    -Wold-style-cast
+    -Wopenacc-parallelism
+    -Wopenmp
+    -Wopenmp-simd
+    -Woverflow
+    -Woverlength-strings
+    -Woverloaded-virtual=2
+    -Wpacked
+    -Wpacked-bitfield-compat
+    -Wpacked-not-aligned
+    -Wno-padded
+    -Wparentheses
+    -Wpedantic
+    -Wpessimizing-move
+    -Wplacement-new=2
+    -Wpmf-conversions
+    -Wpointer-arith
+    -Wpointer-compare
+    -Wpragma-once-outside-header
+    -Wpragmas
+    -Wprio-ctor-dtor
+    -Wpsabi
+    -Wrange-loop-construct
+    -Wredundant-decls
+    -Wredundant-move
+    -Wredundant-tags
+    -Wregister
+    -Wreorder
+    -Wrestrict
+    -Wreturn-local-addr
+    -Wreturn-type
+    -Wscalar-storage-order
+    -Wself-move
+    -Wsequence-point
+    -Wshadow=compatible-local
+    -Wshadow=global
+    -Wshadow=local
+    -Wshift-count-negative
+    -Wshift-count-overflow
+    -Wshift-negative-value
+    -Wshift-overflow=2
+    -Wsign-compare
+    -Wsign-conversion
+    -Wsign-promo
+    -Wsized-deallocation
+    -Wsizeof-array-argument
+    -Wsizeof-array-div
+    -Wsizeof-pointer-div
+    -Wsizeof-pointer-memaccess
+    -Wstack-protector
+    -Wstrict-aliasing
+    -Wstrict-aliasing=3
+    -Wstrict-null-sentinel
+    -Wstrict-overflow
+    -Wstring-compare
+    -Wstringop-overflow
+    -Wstringop-overflow=4
+    -Wstringop-overread
+    -Wstringop-truncation
+    -Wsubobject-linkage
+    -Wsuggest-attribute=cold
+    -Wsuggest-attribute=const
+    -Wsuggest-attribute=format
+    -Wsuggest-attribute=malloc
+    -Wsuggest-attribute=noreturn
+    -Wsuggest-attribute=pure
+    -Wsuggest-attribute=returns_nonnull
+    -Wsuggest-final-methods
+    -Wsuggest-final-types
+    -Wsuggest-override
+    -Wswitch
+    -Wswitch-bool
+    -Wswitch-default
+    -Wswitch-enum
+    -Wswitch-outside-range
+    -Wswitch-unreachable
+    -Wsync-nand
+    -Wsynth
+    -Wno-system-headers
+    -Wtautological-compare
+    -Wtemplate-body
+    -Wtemplate-id-cdtor
+    -Wtemplate-names-tu-local
+    -Wno-templates
+    -Wterminate
+    -Wtrailing-whitespace
+    -Wtrampolines
+    -Wtrigraphs
+    -Wtrivial-auto-var-init
+    -Wtsan
+    -Wtype-limits
+    -Wundef
+    -Wunicode
+    -Wuninitialized
+    -Wunknown-pragmas
+    -Wunreachable-code
+    -Wunsafe-loop-optimizations
+    -Wunused
+    -Wunused-but-set-parameter
+    -Wunused-but-set-variable
+    -Wunused-const-variable=2
+    -Wunused-function
+    -Wunused-label
+    -Wunused-local-typedefs
+    -Wunused-macros
+    -Wunused-parameter
+    -Wunused-result
+    -Wunused-value
+    -Wunused-variable
+    -Wuse-after-free=3
+    -Wuseless-cast
+    -Wvarargs
+    -Wvariadic-macros
+    -Wvector-operation-performance
+    -Wvexing-parse
+    -Wvirtual-inheritance
+    -Wvirtual-move-assign
+    -Wvla
+    -Wvla-parameter
+    -Wvolatile
+    -Wvolatile-register-var
+    -Wwrite-strings
+    -Wxor-used-as-pow
+    -Wzero-as-null-pointer-constant
+    -Wzero-length-bounds
+)

cmake/nlohmann_jsonConfigVersion.cmake.in

@@ -0,0 +1,20 @@
+# This is essentially cmake's BasicConfigVersion-SameMajorVersion.cmake.in but
+# without the 32/64-bit check.  Since json is a header-only library, it doesn't
+# matter if it was built on a different platform than what it is used on (see
+# https://github.com/nlohmann/json/issues/1697).
+set(PACKAGE_VERSION "@PROJECT_VERSION@")
+
+if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
+  set(PACKAGE_VERSION_COMPATIBLE FALSE)
+else()
+
+  if(PACKAGE_FIND_VERSION_MAJOR STREQUAL "@PROJECT_VERSION_MAJOR@")
+    set(PACKAGE_VERSION_COMPATIBLE TRUE)
+  else()
+    set(PACKAGE_VERSION_COMPATIBLE FALSE)
+  endif()
+
+  if(PACKAGE_FIND_VERSION STREQUAL PACKAGE_VERSION)
+      set(PACKAGE_VERSION_EXACT TRUE)
+  endif()
+endif()

cmake/pkg-config.pc.in

@@ -0,0 +1,7 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+
+Name: @PROJECT_NAME@
+Description: JSON for Modern C++
+Version: @PROJECT_VERSION@
+Cflags: -I${includedir}

cmake/requirements/requirements-cppcheck.txt

@@ -0,0 +1 @@
+cppcheck==1.5.0

cmake/requirements/requirements-cpplint.txt

@@ -0,0 +1 @@
+cpplint==2.0.2

cmake/requirements/requirements-reuse.txt

@@ -0,0 +1 @@
+reuse==6.2.0

cmake/scripts/gen_bazel_build_file.cmake

@@ -0,0 +1,24 @@
+# generate Bazel BUILD file
+
+set(PROJECT_ROOT "${CMAKE_CURRENT_LIST_DIR}/../..")
+set(BUILD_FILE "${PROJECT_ROOT}/BUILD.bazel")
+
+file(GLOB_RECURSE HEADERS LIST_DIRECTORIES false RELATIVE "${PROJECT_ROOT}" "include/*.hpp")
+
+file(WRITE "${BUILD_FILE}" [=[
+cc_library(
+    name = "json",
+    hdrs = [
+]=])
+
+foreach(header ${HEADERS})
+    file(APPEND "${BUILD_FILE}" "        \"${header}\",\n")
+endforeach()
+
+file(APPEND "${BUILD_FILE}" [=[
+    ],
+    includes = ["include"],
+    visibility = ["//visibility:public"],
+    alwayslink = True,
+)
+]=])

cmake/test.cmake

@@ -0,0 +1,273 @@
+set(_json_test_cmake_list_file ${CMAKE_CURRENT_LIST_FILE})
+
+#############################################################################
+# download test data
+#############################################################################
+
+include(download_test_data)
+
+# test fixture to download test data
+add_test(NAME "download_test_data" COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR}
+    --target download_test_data
+)
+set_tests_properties(download_test_data PROPERTIES FIXTURES_SETUP TEST_DATA)
+
+if(JSON_Valgrind)
+    find_program(CMAKE_MEMORYCHECK_COMMAND valgrind)
+    message(STATUS "Executing test suite with Valgrind (${CMAKE_MEMORYCHECK_COMMAND})")
+    set(memcheck_command "${CMAKE_MEMORYCHECK_COMMAND} ${CMAKE_MEMORYCHECK_COMMAND_OPTIONS} --error-exitcode=1 --leak-check=full")
+    separate_arguments(memcheck_command)
+endif()
+
+#############################################################################
+# detect standard support
+#############################################################################
+
+# C++11 is the minimum required
+set(compiler_supports_cpp_11 TRUE)
+
+foreach(feature ${CMAKE_CXX_COMPILE_FEATURES})
+    if (${feature} STREQUAL cxx_std_14)
+        set(compiler_supports_cpp_14 TRUE)
+    elseif (${feature} STREQUAL cxx_std_17)
+        set(compiler_supports_cpp_17 TRUE)
+    elseif (${feature} STREQUAL cxx_std_20)
+        set(compiler_supports_cpp_20 TRUE)
+    elseif (${feature} STREQUAL cxx_std_23)
+        set(compiler_supports_cpp_23 TRUE)
+    endif()
+endforeach()
+
+#############################################################################
+# test functions
+#############################################################################
+
+#############################################################################
+# json_test_set_test_options(
+#     all|<tests>
+#     [CXX_STANDARDS all|<args>...]
+#     [COMPILE_DEFINITIONS <args>...]
+#     [COMPILE_FEATURES <args>...]
+#     [COMPILE_OPTIONS <args>...]
+#     [LINK_LIBRARIES <args>...]
+#     [LINK_OPTIONS <args>...]
+#     [TEST_PROPERTIES <args>...])
+#
+# Supply test- and standard-specific build settings and/or test properties.
+# Specify multiple tests using a list e.g., "test-foo;test-bar".
+#
+# Must be called BEFORE the test is created.
+#############################################################################
+
+function(json_test_set_test_options tests)
+    cmake_parse_arguments(args "" ""
+        "CXX_STANDARDS;COMPILE_DEFINITIONS;COMPILE_FEATURES;COMPILE_OPTIONS;LINK_LIBRARIES;LINK_OPTIONS;TEST_PROPERTIES"
+        ${ARGN})
+
+    if(NOT args_CXX_STANDARDS)
+        set(args_CXX_STANDARDS "all")
+    endif()
+
+    foreach(test ${tests})
+        if("${test}" STREQUAL "all")
+            set(test "")
+        endif()
+
+        foreach(cxx_standard ${args_CXX_STANDARDS})
+            if("${cxx_standard}" STREQUAL "all")
+                if("${test}" STREQUAL "")
+                    message(FATAL_ERROR "Not supported. Change defaults in: ${_json_test_cmake_list_file}")
+                endif()
+                set(test_interface _json_test_interface_${test})
+            else()
+                set(test_interface _json_test_interface_${test}_cpp_${cxx_standard})
+            endif()
+
+            if(NOT TARGET ${test_interface})
+                add_library(${test_interface} INTERFACE)
+            endif()
+
+            target_compile_definitions(${test_interface} INTERFACE ${args_COMPILE_DEFINITIONS})
+            target_compile_features(${test_interface} INTERFACE ${args_COMPILE_FEATURES})
+            target_compile_options(${test_interface} INTERFACE ${args_COMPILE_OPTIONS})
+            target_link_libraries (${test_interface} INTERFACE ${args_LINK_LIBRARIES})
+            target_link_options(${test_interface} INTERFACE ${args_LINK_OPTIONS})
+            #set_target_properties(${test_interface} PROPERTIES JSON_TEST_PROPERTIES "${args_TEST_PROPERTIES}")
+            set_property(DIRECTORY PROPERTY
+                ${test_interface}_TEST_PROPERTIES "${args_TEST_PROPERTIES}"
+            )
+        endforeach()
+    endforeach()
+endfunction()
+
+# for internal use by _json_test_add_test()
+function(_json_test_apply_test_properties test_target properties_target)
+    #get_target_property(test_properties ${properties_target} JSON_TEST_PROPERTIES)
+    get_property(test_properties DIRECTORY PROPERTY ${properties_target}_TEST_PROPERTIES)
+    if(test_properties)
+        set_tests_properties(${test_target} PROPERTIES ${test_properties})
+    endif()
+endfunction()
+
+# for internal use by json_test_add_test_for()
+function(_json_test_add_test test_name file main cxx_standard)
+    set(test_target ${test_name}_cpp${cxx_standard})
+
+    if(TARGET ${test_target})
+        message(FATAL_ERROR "Target ${test_target} has already been added.")
+    endif()
+
+    add_executable(${test_target} ${file})
+    target_link_libraries(${test_target} PRIVATE ${main})
+
+    # set and require C++ standard
+    set_target_properties(${test_target} PROPERTIES
+        CXX_STANDARD ${cxx_standard}
+        CXX_STANDARD_REQUIRED ON
+    )
+
+    # apply standard-specific build settings
+    if(TARGET _json_test_interface__cpp_${cxx_standard})
+        target_link_libraries(${test_target} PRIVATE _json_test_interface__cpp_${cxx_standard})
+    endif()
+
+    # apply test-specific build settings
+    if(TARGET _json_test_interface_${test_name})
+        target_link_libraries(${test_target} PRIVATE _json_test_interface_${test_name})
+    endif()
+
+    # apply test- and standard-specific build settings
+    if(TARGET _json_test_interface_${test_name}_cpp_${cxx_standard})
+        target_link_libraries(${test_target} PRIVATE
+            _json_test_interface_${test_name}_cpp_${cxx_standard}
+        )
+    endif()
+
+    if (JSON_FastTests)
+        add_test(NAME ${test_target}
+            COMMAND ${test_target} ${DOCTEST_TEST_FILTER}
+            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        )
+    else()
+        add_test(NAME ${test_target}
+            COMMAND ${test_target} ${DOCTEST_TEST_FILTER} --no-skip
+            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        )
+    endif()
+    set_tests_properties(${test_target} PROPERTIES LABELS "all" FIXTURES_REQUIRED TEST_DATA)
+
+    # apply standard-specific test properties
+    if(TARGET _json_test_interface__cpp_${cxx_standard})
+        _json_test_apply_test_properties(${test_target} _json_test_interface__cpp_${cxx_standard})
+    endif()
+
+    # apply test-specific test properties
+    if(TARGET _json_test_interface_${test_name})
+        _json_test_apply_test_properties(${test_target} _json_test_interface_${test_name})
+    endif()
+
+    # apply test- and standard-specific test properties
+    if(TARGET _json_test_interface_${test_name}_cpp_${cxx_standard})
+        _json_test_apply_test_properties(${test_target}
+            _json_test_interface_${test_name}_cpp_${cxx_standard}
+        )
+    endif()
+
+    if(JSON_Valgrind)
+        add_test(NAME ${test_target}_valgrind
+            COMMAND ${memcheck_command} $<TARGET_FILE:${test_target}> ${DOCTEST_TEST_FILTER}
+            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        )
+        set_tests_properties(${test_target}_valgrind PROPERTIES
+            LABELS "valgrind" FIXTURES_REQUIRED TEST_DATA
+        )
+    endif()
+endfunction()
+
+#############################################################################
+# json_test_add_test_for(
+#     <file>
+#     [NAME <name>]
+#     MAIN <main>
+#     [CXX_STANDARDS <version_number>...] [FORCE])
+#
+# Given a <file> unit-foo.cpp, produces
+#
+#     test-foo_cpp<version_number>
+#
+# if C++ standard <version_number> is supported by the compiler and the
+# source file contains JSON_HAS_CPP_<version_number>.
+# Use NAME <name> to override the filename-derived test name.
+# Use FORCE to create the test regardless of the file containing
+# JSON_HAS_CPP_<version_number>.
+# Test targets are linked against <main>.
+# CXX_STANDARDS defaults to "11".
+#############################################################################
+
+function(json_test_add_test_for file)
+    cmake_parse_arguments(args "FORCE" "MAIN;NAME" "CXX_STANDARDS" ${ARGN})
+
+    if("${args_MAIN}" STREQUAL "")
+        message(FATAL_ERROR "Required argument MAIN <main> missing.")
+    endif()
+
+    if("${args_NAME}" STREQUAL "")
+        get_filename_component(file_basename ${file} NAME_WE)
+        string(REGEX REPLACE "unit-([^$]+)" "test-\\1" test_name ${file_basename})
+    else()
+        set(test_name ${args_NAME})
+        if(NOT test_name MATCHES "test-[^$]+")
+            message(FATAL_ERROR "Test name must start with 'test-'.")
+        endif()
+    endif()
+
+    if("${args_CXX_STANDARDS}" STREQUAL "")
+        set(args_CXX_STANDARDS 11)
+    endif()
+
+    file(READ ${file} file_content)
+    foreach(cxx_standard ${args_CXX_STANDARDS})
+        if(NOT compiler_supports_cpp_${cxx_standard})
+            continue()
+        endif()
+
+        # add unconditionally if C++11 (default) or forced
+        if(NOT ("${cxx_standard}" STREQUAL 11 OR args_FORCE))
+            string(FIND "${file_content}" JSON_HAS_CPP_${cxx_standard} has_cpp_found)
+            if(${has_cpp_found} EQUAL -1)
+                continue()
+            endif()
+        endif()
+
+        _json_test_add_test(${test_name} ${file} ${args_MAIN} ${cxx_standard})
+    endforeach()
+endfunction()
+
+#############################################################################
+# json_test_should_build_32bit_test(
+#     <build_32bit_var> <build_32bit_only_var> <input>)
+#
+# Check if the 32bit unit test should be built based on the value of <input>
+# and store the result in the variables <build_32bit_var> and
+# <build_32bit_only_var>.
+#############################################################################
+
+function(json_test_should_build_32bit_test build_32bit_var build_32bit_only_var input)
+    set(${build_32bit_only_var} OFF PARENT_SCOPE)
+    string(TOUPPER "${input}" ${build_32bit_var})
+    if("${${build_32bit_var}}" STREQUAL AUTO)
+        # check if compiler is targeting 32bit by default
+        include(CheckTypeSize)
+        check_type_size("size_t" sizeof_size_t LANGUAGE CXX)
+        if(${sizeof_size_t} AND ${sizeof_size_t} EQUAL 4)
+            message(STATUS "Auto-enabling 32bit unit test.")
+            set(${build_32bit_var} ON)
+        else()
+            set(${build_32bit_var} OFF)
+        endif()
+    elseif("${${build_32bit_var}}" STREQUAL ONLY)
+        set(${build_32bit_only_var} ON PARENT_SCOPE)
+    endif()
+
+    set(${build_32bit_var} "${${build_32bit_var}}" PARENT_SCOPE)
+endfunction()

doc/Doxyfile

@@ -1,317 +0,0 @@
-# Doxyfile 1.8.9.1
-
-#---------------------------------------------------------------------------
-# Project related configuration options
-#---------------------------------------------------------------------------
-DOXYFILE_ENCODING      = UTF-8
-PROJECT_NAME           = "JSON for Modern C++"
-PROJECT_NUMBER         = 2.0.2
-PROJECT_BRIEF          = 
-PROJECT_LOGO           =
-OUTPUT_DIRECTORY       = .
-CREATE_SUBDIRS         = NO
-ALLOW_UNICODE_NAMES    = NO
-OUTPUT_LANGUAGE        = English
-BRIEF_MEMBER_DESC      = YES
-REPEAT_BRIEF           = NO
-ABBREVIATE_BRIEF       =
-ALWAYS_DETAILED_SEC    = YES
-INLINE_INHERITED_MEMB  = NO
-FULL_PATH_NAMES        = YES
-STRIP_FROM_PATH        =
-STRIP_FROM_INC_PATH    =
-SHORT_NAMES            = NO
-JAVADOC_AUTOBRIEF      = NO
-QT_AUTOBRIEF           = NO
-MULTILINE_CPP_IS_BRIEF = NO
-INHERIT_DOCS           = YES
-SEPARATE_MEMBER_PAGES  = YES
-TAB_SIZE               = 4
-ALIASES                = "complexity=@par Complexity\n"
-ALIASES                += liveexample{2}="@par Example\n \1 \n @includelineno \2.cpp \n Output (play with this example @htmlinclude \2.link):\n @verbinclude \2.output \n The example code above can be translated with @verbatim g++ -std=c++11 -Isrc doc/examples/\2.cpp -o \2 @endverbatim"
-ALIASES                += requirement="@par Requirements\n"
-ALIASES                += exceptionsafety="@par Exception safety\n"
-TCL_SUBST              =
-OPTIMIZE_OUTPUT_FOR_C  = NO
-OPTIMIZE_OUTPUT_JAVA   = NO
-OPTIMIZE_FOR_FORTRAN   = NO
-OPTIMIZE_OUTPUT_VHDL   = NO
-EXTENSION_MAPPING      =
-MARKDOWN_SUPPORT       = YES
-AUTOLINK_SUPPORT       = NO
-BUILTIN_STL_SUPPORT    = YES
-CPP_CLI_SUPPORT        = NO
-SIP_SUPPORT            = NO
-IDL_PROPERTY_SUPPORT   = YES
-DISTRIBUTE_GROUP_DOC   = NO
-SUBGROUPING            = YES
-INLINE_GROUPED_CLASSES = NO
-INLINE_SIMPLE_STRUCTS  = NO
-TYPEDEF_HIDES_STRUCT   = NO
-LOOKUP_CACHE_SIZE      = 0
-#---------------------------------------------------------------------------
-# Build related configuration options
-#---------------------------------------------------------------------------
-EXTRACT_ALL            = YES
-EXTRACT_PRIVATE        = NO
-EXTRACT_PACKAGE        = YES
-EXTRACT_STATIC         = YES
-EXTRACT_LOCAL_CLASSES  = YES
-EXTRACT_LOCAL_METHODS  = YES
-EXTRACT_ANON_NSPACES   = YES
-HIDE_UNDOC_MEMBERS     = NO
-HIDE_UNDOC_CLASSES     = NO
-HIDE_FRIEND_COMPOUNDS  = NO
-HIDE_IN_BODY_DOCS      = NO
-INTERNAL_DOCS          = NO
-CASE_SENSE_NAMES       = NO
-HIDE_SCOPE_NAMES       = NO
-HIDE_COMPOUND_REFERENCE= NO
-SHOW_INCLUDE_FILES     = YES
-SHOW_GROUPED_MEMB_INC  = NO
-FORCE_LOCAL_INCLUDES   = NO
-INLINE_INFO            = YES
-SORT_MEMBER_DOCS       = YES
-SORT_BRIEF_DOCS        = YES
-SORT_MEMBERS_CTORS_1ST = YES
-SORT_GROUP_NAMES       = NO
-SORT_BY_SCOPE_NAME     = NO
-STRICT_PROTO_MATCHING  = NO
-GENERATE_TODOLIST      = YES
-GENERATE_TESTLIST      = YES
-GENERATE_BUGLIST       = YES
-GENERATE_DEPRECATEDLIST= YES
-ENABLED_SECTIONS       =
-MAX_INITIALIZER_LINES  = 30
-SHOW_USED_FILES        = NO
-SHOW_FILES             = NO
-SHOW_NAMESPACES        = NO
-FILE_VERSION_FILTER    =
-LAYOUT_FILE            =
-CITE_BIB_FILES         =
-#---------------------------------------------------------------------------
-# Configuration options related to warning and progress messages
-#---------------------------------------------------------------------------
-QUIET                  = YES
-WARNINGS               = YES
-WARN_IF_UNDOCUMENTED   = YES
-WARN_IF_DOC_ERROR      = YES
-WARN_NO_PARAMDOC       = YES
-WARN_FORMAT            = "$file:$line: $text"
-WARN_LOGFILE           =
-#---------------------------------------------------------------------------
-# Configuration options related to the input files
-#---------------------------------------------------------------------------
-INPUT                  = ../src/json.hpp index.md
-INPUT_ENCODING         = UTF-8
-FILE_PATTERNS          =
-RECURSIVE              = NO
-EXCLUDE                =
-EXCLUDE_SYMLINKS       = NO
-EXCLUDE_PATTERNS       =
-EXCLUDE_SYMBOLS        = nlohmann::anonymous_namespace
-EXAMPLE_PATH           = examples
-EXAMPLE_PATTERNS       =
-EXAMPLE_RECURSIVE      = NO
-IMAGE_PATH             = images
-INPUT_FILTER           =
-FILTER_PATTERNS        =
-FILTER_SOURCE_FILES    = NO
-FILTER_SOURCE_PATTERNS =
-USE_MDFILE_AS_MAINPAGE = index.md
-#---------------------------------------------------------------------------
-# Configuration options related to source browsing
-#---------------------------------------------------------------------------
-SOURCE_BROWSER         = YES
-INLINE_SOURCES         = NO
-STRIP_CODE_COMMENTS    = YES
-REFERENCED_BY_RELATION = NO
-REFERENCES_RELATION    = NO
-REFERENCES_LINK_SOURCE = NO
-SOURCE_TOOLTIPS        = YES
-USE_HTAGS              = NO
-VERBATIM_HEADERS       = NO
-#---------------------------------------------------------------------------
-# Configuration options related to the alphabetical class index
-#---------------------------------------------------------------------------
-ALPHABETICAL_INDEX     = YES
-COLS_IN_ALPHA_INDEX    = 5
-IGNORE_PREFIX          =
-#---------------------------------------------------------------------------
-# Configuration options related to the HTML output
-#---------------------------------------------------------------------------
-GENERATE_HTML          = YES
-HTML_OUTPUT            = html
-HTML_FILE_EXTENSION    = .html
-HTML_HEADER            =
-HTML_FOOTER            =
-HTML_STYLESHEET        =
-HTML_EXTRA_STYLESHEET  = css/mylayout.css
-HTML_EXTRA_FILES       =
-HTML_COLORSTYLE_HUE    = 220
-HTML_COLORSTYLE_SAT    = 100
-HTML_COLORSTYLE_GAMMA  = 80
-HTML_TIMESTAMP         = YES
-HTML_DYNAMIC_SECTIONS  = YES
-HTML_INDEX_NUM_ENTRIES = 100
-GENERATE_DOCSET        = YES
-DOCSET_FEEDNAME        = "Doxygen generated docs"
-DOCSET_BUNDLE_ID       = me.nlohmann.json
-DOCSET_PUBLISHER_ID    = me.nlohmann
-DOCSET_PUBLISHER_NAME  = Niels Lohmann
-GENERATE_HTMLHELP      = NO
-CHM_FILE               =
-HHC_LOCATION           =
-GENERATE_CHI           = NO
-CHM_INDEX_ENCODING     =
-BINARY_TOC             = NO
-TOC_EXPAND             = NO
-GENERATE_QHP           = NO
-QCH_FILE               =
-QHP_NAMESPACE          = org.doxygen.Project
-QHP_VIRTUAL_FOLDER     = doc
-QHP_CUST_FILTER_NAME   =
-QHP_CUST_FILTER_ATTRS  =
-QHP_SECT_FILTER_ATTRS  =
-QHG_LOCATION           =
-GENERATE_ECLIPSEHELP   = NO
-ECLIPSE_DOC_ID         = org.doxygen.Project
-DISABLE_INDEX          = NO
-GENERATE_TREEVIEW      = NO
-ENUM_VALUES_PER_LINE   = 4
-TREEVIEW_WIDTH         = 250
-EXT_LINKS_IN_WINDOW    = NO
-FORMULA_FONTSIZE       = 10
-FORMULA_TRANSPARENT    = YES
-USE_MATHJAX            = NO
-MATHJAX_FORMAT         = HTML-CSS
-MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
-MATHJAX_EXTENSIONS     =
-MATHJAX_CODEFILE       =
-SEARCHENGINE           = YES
-SERVER_BASED_SEARCH    = NO
-EXTERNAL_SEARCH        = NO
-SEARCHENGINE_URL       =
-SEARCHDATA_FILE        = searchdata.xml
-EXTERNAL_SEARCH_ID     =
-EXTRA_SEARCH_MAPPINGS  =
-#---------------------------------------------------------------------------
-# Configuration options related to the LaTeX output
-#---------------------------------------------------------------------------
-GENERATE_LATEX         = NO
-LATEX_OUTPUT           = latex
-LATEX_CMD_NAME         = latex
-MAKEINDEX_CMD_NAME     = makeindex
-COMPACT_LATEX          = NO
-PAPER_TYPE             = a4
-EXTRA_PACKAGES         =
-LATEX_HEADER           =
-LATEX_FOOTER           =
-LATEX_EXTRA_STYLESHEET =
-LATEX_EXTRA_FILES      =
-PDF_HYPERLINKS         = YES
-USE_PDFLATEX           = YES
-LATEX_BATCHMODE        = NO
-LATEX_HIDE_INDICES     = NO
-LATEX_SOURCE_CODE      = NO
-LATEX_BIB_STYLE        = plain
-#---------------------------------------------------------------------------
-# Configuration options related to the RTF output
-#---------------------------------------------------------------------------
-GENERATE_RTF           = NO
-RTF_OUTPUT             = rtf
-COMPACT_RTF            = NO
-RTF_HYPERLINKS         = NO
-RTF_STYLESHEET_FILE    =
-RTF_EXTENSIONS_FILE    =
-RTF_SOURCE_CODE        = NO
-#---------------------------------------------------------------------------
-# Configuration options related to the man page output
-#---------------------------------------------------------------------------
-GENERATE_MAN           = NO
-MAN_OUTPUT             = man
-MAN_EXTENSION          = .3
-MAN_SUBDIR             =
-MAN_LINKS              = NO
-#---------------------------------------------------------------------------
-# Configuration options related to the XML output
-#---------------------------------------------------------------------------
-GENERATE_XML           = YES
-XML_OUTPUT             = xml
-XML_PROGRAMLISTING     = YES
-#---------------------------------------------------------------------------
-# Configuration options related to the DOCBOOK output
-#---------------------------------------------------------------------------
-GENERATE_DOCBOOK       = NO
-DOCBOOK_OUTPUT         = docbook
-DOCBOOK_PROGRAMLISTING = NO
-#---------------------------------------------------------------------------
-# Configuration options for the AutoGen Definitions output
-#---------------------------------------------------------------------------
-GENERATE_AUTOGEN_DEF   = NO
-#---------------------------------------------------------------------------
-# Configuration options related to the Perl module output
-#---------------------------------------------------------------------------
-GENERATE_PERLMOD       = NO
-PERLMOD_LATEX          = NO
-PERLMOD_PRETTY         = YES
-PERLMOD_MAKEVAR_PREFIX =
-#---------------------------------------------------------------------------
-# Configuration options related to the preprocessor
-#---------------------------------------------------------------------------
-ENABLE_PREPROCESSING   = YES
-MACRO_EXPANSION        = NO
-EXPAND_ONLY_PREDEF     = NO
-SEARCH_INCLUDES        = YES
-INCLUDE_PATH           =
-INCLUDE_FILE_PATTERNS  =
-PREDEFINED             =
-EXPAND_AS_DEFINED      =
-SKIP_FUNCTION_MACROS   = YES
-#---------------------------------------------------------------------------
-# Configuration options related to external references
-#---------------------------------------------------------------------------
-TAGFILES               =
-GENERATE_TAGFILE       =
-ALLEXTERNALS           = NO
-EXTERNAL_GROUPS        = YES
-EXTERNAL_PAGES         = YES
-PERL_PATH              = /usr/bin/perl
-#---------------------------------------------------------------------------
-# Configuration options related to the dot tool
-#---------------------------------------------------------------------------
-CLASS_DIAGRAMS         = NO
-MSCGEN_PATH            =
-DIA_PATH               =
-HIDE_UNDOC_RELATIONS   = YES
-HAVE_DOT               = YES
-DOT_NUM_THREADS        = 0
-DOT_FONTNAME           = Helvetica
-DOT_FONTSIZE           = 10
-DOT_FONTPATH           =
-CLASS_GRAPH            = NO
-COLLABORATION_GRAPH    = NO
-GROUP_GRAPHS           = YES
-UML_LOOK               = YES
-UML_LIMIT_NUM_FIELDS   = 10
-TEMPLATE_RELATIONS     = NO
-INCLUDE_GRAPH          = NO
-INCLUDED_BY_GRAPH      = NO
-CALL_GRAPH             = NO
-CALLER_GRAPH           = NO
-GRAPHICAL_HIERARCHY    = NO
-DIRECTORY_GRAPH        = NO
-DOT_IMAGE_FORMAT       = svg
-INTERACTIVE_SVG        = YES
-DOT_PATH               =
-DOTFILE_DIRS           =
-MSCFILE_DIRS           =
-DIAFILE_DIRS           =
-PLANTUML_JAR_PATH      =
-PLANTUML_INCLUDE_PATH  =
-DOT_GRAPH_MAX_NODES    = 50
-MAX_DOT_GRAPH_DEPTH    = 0
-DOT_TRANSPARENT        = NO
-DOT_MULTI_TARGETS      = NO
-GENERATE_LEGEND        = YES
-DOT_CLEANUP            = YES

doc/Makefile

@@ -1,84 +0,0 @@
-SRCDIR = ../src
-SED:=$(shell command -v gsed || which sed)
-
-all: doxygen
-
-
-##########################################################################
-# example files
-##########################################################################
-
-# where are the example cpp files
-EXAMPLES = $(wildcard examples/*.cpp)
-
-# create output from a stand-alone example file
-%.output: %.cpp
-	make $(<:.cpp=) CPPFLAGS="-I $(SRCDIR)" CXXFLAGS="-std=c++11"
-	./$(<:.cpp=) > $@
-	rm $(<:.cpp=)
-
-# compare created output with current output of the example files
-%.test: %.cpp
-	make $(<:.cpp=) CPPFLAGS="-I $(SRCDIR)" CXXFLAGS="-std=c++11"
-	./$(<:.cpp=) > $@
-	diff $@ $(<:.cpp=.output)
-	rm $(<:.cpp=) $@
-
-# create links to try the code online
-%.link: %.cpp
-	rm -fr tmp
-	mkdir tmp
-	cp $(SRCDIR)/json.hpp tmp
-	scripts/send_to_wandbox.py tmp $< > $@.tmp
-	/bin/echo -n "<a target=\"_blank\" href=\"`cat $@.tmp`\"><b>online</b></a>" > $@
-	rm -fr tmp $@.tmp
-
-# create output from all stand-alone example files
-create_output: $(EXAMPLES:.cpp=.output)
-
-create_links: $(EXAMPLES:.cpp=.link)
-
-# check output of all stand-alone example files
-check_output: $(EXAMPLES:.cpp=.test)
-
-
-clean:
-	rm -fr me.nlohmann.json.docset html $(EXAMPLES:.cpp=)
-
-
-##########################################################################
-# Doxygen HTML documentation
-##########################################################################
-
-# create Doxygen documentation
-doxygen: create_output create_links
-	doxygen
-	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType &gt;@@g' html/*.html
-	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberFloatType,&#160;AllocatorType&#160;&gt;@@g' html/*.html
-	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType &gt;@@g' html/*.html
-	$(SED) -i 's@< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType >@@g' html/*.html
-
-upload: clean doxygen check_output
-	cd html ; ../scripts/git-update-ghpages nlohmann/json
-	rm -fr html
-	open http://nlohmann.github.io/json/
-
-
-##########################################################################
-# docset
-##########################################################################
-
-# create docset for Dash
-docset: create_output
-	cp Doxyfile Doxyfile_docset
-	$(SED) -i 's/DISABLE_INDEX          = NO/DISABLE_INDEX          = YES/' Doxyfile_docset
-	$(SED) -i 's/SEARCHENGINE           = YES/SEARCHENGINE           = NO/' Doxyfile_docset
-	$(SED) -i 's@HTML_EXTRA_STYLESHEET  = css/mylayout.css@HTML_EXTRA_STYLESHEET  = css/mylayout_docset.css@' Doxyfile_docset
-	rm -fr html *.docset
-	doxygen Doxyfile_docset
-	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType &gt;@@g' html/*.html
-	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberFloatType,&#160;AllocatorType&#160;&gt;@@g' html/*.html
-	make -C html
-	mv html/*.docset .
-	$(SED) -i 's@<string>doxygen</string>@<string>json</string>@' me.nlohmann.json.docset/Contents/Info.plist
-	rm -fr Doxyfile_docset html

doc/css/mylayout.css

@@ -1,26 +0,0 @@
-/* hide lengthy template information */
-.memtemplate, .memTemplParams {
-    display: none;
-}
-
-/* allow compiler information to wrap */
-/* https://css-tricks.com/snippets/css/make-pre-text-wrap/ */
-pre.fragment {
-    white-space: pre-wrap;       /* css-3 */
-    white-space: -moz-pre-wrap;  /* Mozilla, since 1999 */
-    white-space: -pre-wrap;      /* Opera 4-6 */
-    white-space: -o-pre-wrap;    /* Opera 7 */
-    word-wrap: break-word;       /* Internet Explorer 5.5+ */
-}
-
-td.paramname {
-    vertical-align: top;
-}
-
-.ok_green {
-    background-color: #89C35C;
-}
-
-.nok_throws {
-    background-color: #ffa500;
-}

doc/css/mylayout_docset.css

@@ -1,27 +0,0 @@
-.memtemplate {
-    display: none;
-}
-
-.memTemplParams {
-    display: none;
-}
-
-.navtab {
-    display: none;
-}
-
-#top, .footer {
-    display: none;
-}
-
-td.paramname {
-    vertical-align: top;
-}
-
-.ok_green {
-    background-color: #89C35C;
-}
-
-.nok_throws {
-    background-color: #ffa500;
-}

doc/examples/README.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/p5o4znPnGHJpDVqN"><b>online</b></a>

doc/examples/array.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/1fsm4gI55p83DOwU"><b>online</b></a>

doc/examples/at__object_t_key_type.cpp

@@ -1,33 +0,0 @@
-#include <json.hpp>
-
-using json = nlohmann::json;
-
-int main()
-{
-    // create JSON object
-    json object =
-    {
-        {"the good", "il buono"},
-        {"the bad", "il cativo"},
-        {"the ugly", "il brutto"}
-    };
-
-    // output element with key "the ugly"
-    std::cout << object.at("the ugly") << '\n';
-
-    // change element with key "the bad"
-    object.at("the bad") = "il cattivo";
-
-    // output changed array
-    std::cout << object << '\n';
-
-    // try to write at a nonexisting key
-    try
-    {
-        object.at("the fast") = "il rapido";
-    }
-    catch (std::out_of_range& e)
-    {
-        std::cout << "out of range: " << e.what() << '\n';
-    }
-}

doc/examples/at__object_t_key_type.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/rsnwWxpDjmtRRSzb"><b>online</b></a>

doc/examples/at__object_t_key_type.output

@@ -1,3 +0,0 @@
-"il brutto"
-{"the bad":"il cattivo","the good":"il buono","the ugly":"il brutto"}
-out of range: key 'the fast' not found

doc/examples/at__object_t_key_type_const.cpp

@@ -1,27 +0,0 @@
-#include <json.hpp>
-
-using json = nlohmann::json;
-
-int main()
-{
-    // create JSON object
-    json object =
-    {
-        {"the good", "il buono"},
-        {"the bad", "il cativo"},
-        {"the ugly", "il brutto"}
-    };
-
-    // output element with key "the ugly"
-    std::cout << object.at("the ugly") << '\n';
-
-    // try to read from a nonexisting key
-    try
-    {
-        std::cout << object.at("the fast") << '\n';
-    }
-    catch (std::out_of_range)
-    {
-        std::cout << "out of range" << '\n';
-    }
-}

doc/examples/at__object_t_key_type_const.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/aeoZrnhnb3HKClCY"><b>online</b></a>

doc/examples/at__object_t_key_type_const.output

@@ -1,2 +0,0 @@
-"il brutto"
-out of range

doc/examples/at__size_type.cpp

@@ -1,28 +0,0 @@
-#include <json.hpp>
-
-using json = nlohmann::json;
-
-int main()
-{
-    // create JSON array
-    json array = {"first", "2nd", "third", "fourth"};
-
-    // output element at index 2 (third element)
-    std::cout << array.at(2) << '\n';
-
-    // change element at index 1 (second element) to "second"
-    array.at(1) = "second";
-
-    // output changed array
-    std::cout << array << '\n';
-
-    // try to write beyond the array limit
-    try
-    {
-        array.at(5) = "sixth";
-    }
-    catch (std::out_of_range& e)
-    {
-        std::cout << "out of range: " << e.what() << '\n';
-    }
-}

doc/examples/at__size_type.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/R7z2SB2rMdFQ9XtR"><b>online</b></a>

doc/examples/at__size_type.output

@@ -1,3 +0,0 @@
-"third"
-["first","second","third","fourth"]
-out of range: array index 5 is out of range

doc/examples/at__size_type_const.cpp

@@ -1,22 +0,0 @@
-#include <json.hpp>
-
-using json = nlohmann::json;
-
-int main()
-{
-    // create JSON array
-    json array = {"first", "2nd", "third", "fourth"};
-
-    // output element at index 2 (third element)
-    std::cout << array.at(2) << '\n';
-
-    // try to read beyond the array limit
-    try
-    {
-        std::cout << array.at(5) << '\n';
-    }
-    catch (std::out_of_range)
-    {
-        std::cout << "out of range" << '\n';
-    }
-}

doc/examples/at__size_type_const.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/L1bMeiN6nYm7JrvA"><b>online</b></a>

doc/examples/at__size_type_const.output

@@ -1,2 +0,0 @@
-"third"
-out of range

doc/examples/at_json_pointer.cpp

@@ -1,35 +0,0 @@
-#include <json.hpp>
-
-using json = nlohmann::json;
-
-int main()
-{
-    // create a JSON value
-    json j =
-    {
-        {"number", 1}, {"string", "foo"}, {"array", {1, 2}}
-    };
-
-    // read-only access
-
-    // output element with JSON pointer "/number"
-    std::cout << j.at("/number"_json_pointer) << '\n';
-    // output element with JSON pointer "/string"
-    std::cout << j.at("/string"_json_pointer) << '\n';
-    // output element with JSON pointer "/array"
-    std::cout << j.at("/array"_json_pointer) << '\n';
-    // output element with JSON pointer "/array/1"
-    std::cout << j.at("/array/1"_json_pointer) << '\n';
-
-    // writing access
-
-    // change the string
-    j.at("/string"_json_pointer) = "bar";
-    // output the changed string
-    std::cout << j["string"] << '\n';
-
-    // change an array element
-    j.at("/array/1"_json_pointer) = 21;
-    // output the changed array
-    std::cout << j["array"] << '\n';
-}

doc/examples/at_json_pointer.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/NDSjglHZIjIZ0Uxg"><b>online</b></a>

doc/examples/at_json_pointer.output

@@ -1,6 +0,0 @@
-1
-"foo"
-[1,2]
-2
-"bar"
-[1,21]

doc/examples/at_json_pointer_const.cpp

@@ -1,23 +0,0 @@
-#include <json.hpp>
-
-using json = nlohmann::json;
-
-int main()
-{
-    // create a JSON value
-    json j =
-    {
-        {"number", 1}, {"string", "foo"}, {"array", {1, 2}}
-    };
-
-    // read-only access
-
-    // output element with JSON pointer "/number"
-    std::cout << j.at("/number"_json_pointer) << '\n';
-    // output element with JSON pointer "/string"
-    std::cout << j.at("/string"_json_pointer) << '\n';
-    // output element with JSON pointer "/array"
-    std::cout << j.at("/array"_json_pointer) << '\n';
-    // output element with JSON pointer "/array/1"
-    std::cout << j.at("/array/1"_json_pointer) << '\n';
-}

doc/examples/at_json_pointer_const.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/OuLYiMJ3pgyOHupb"><b>online</b></a>

doc/examples/back.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/nPVnBcHf8nrNpGOJ"><b>online</b></a>

doc/examples/back.output

@@ -1,6 +0,0 @@
-true
-17
-23.42
-2
-16
-"Hello, world"

doc/examples/basic_json.cpp

@@ -1,12 +0,0 @@
-#include <json.hpp>
-
-using json = nlohmann::json;
-
-int main()
-{
-    // create a JSON value with default null value
-    json j;
-
-    // serialize the JSON null value
-    std::cout << j << '\n';
-}

doc/examples/basic_json.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/dRptmFmhvpsYB49t"><b>online</b></a>

doc/examples/basic_json.output

@@ -1 +0,0 @@
-null

doc/examples/basic_json__CompatibleArrayType.cpp

@@ -1,58 +0,0 @@
-#include <json.hpp>
-#include <deque>
-#include <list>
-#include <forward_list>
-#include <set>
-#include <unordered_set>
-
-using json = nlohmann::json;
-
-int main()
-{
-    // create an array from std::vector
-    std::vector<int> c_vector {1, 2, 3, 4};
-    json j_vec(c_vector);
-
-    // create an array from std::deque
-    std::deque<double> c_deque {1.2, 2.3, 3.4, 5.6};
-    json j_deque(c_deque);
-
-    // create an array from std::list
-    std::list<bool> c_list {true, true, false, true};
-    json j_list(c_list);
-
-    // create an array from std::forward_list
-    std::forward_list<int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543};
-    json j_flist(c_flist);
-
-    // create an array from std::array
-    std::array<unsigned long, 4> c_array {{1, 2, 3, 4}};
-    json j_array(c_array);
-
-    // create an array from std::set
-    std::set<std::string> c_set {"one", "two", "three", "four", "one"};
-    json j_set(c_set); // only one entry for "one" is used
-
-    // create an array from std::unordered_set
-    std::unordered_set<std::string> c_uset {"one", "two", "three", "four", "one"};
-    json j_uset(c_uset); // only one entry for "one" is used
-
-    // create an array from std::multiset
-    std::multiset<std::string> c_mset {"one", "two", "one", "four"};
-    json j_mset(c_mset); // only one entry for "one" is used
-
-    // create an array from std::unordered_multiset
-    std::unordered_multiset<std::string> c_umset {"one", "two", "one", "four"};
-    json j_umset(c_umset); // both entries for "one" are used
-
-    // serialize the JSON arrays
-    std::cout << j_vec << '\n';
-    std::cout << j_deque << '\n';
-    std::cout << j_list << '\n';
-    std::cout << j_flist << '\n';
-    std::cout << j_array << '\n';
-    std::cout << j_set << '\n';
-    std::cout << j_uset << '\n';
-    std::cout << j_mset << '\n';
-    std::cout << j_umset << '\n';
-}

doc/examples/basic_json__CompatibleArrayType.link

@@ -1 +0,0 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/MghSilgvyh4ZJShY"><b>online</b></a>