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Fix contradictions between the documentation, the README, and the library (#5825)
- Discarded values: the legacy macro only changes <= and >=; != is true by default - Out-of-range numbers are rejected while parsing, not stored as NaN - merge_diff round trip: point to the ordered_json caveat - ensure_ascii example shows the escaped output - out_of_range.405 is thrown for "remove"/"move" on the root, not "add" - CBOR stores binary subtypes as tags - Integer/float comparison uses exact values, not conversion - diff, flatten, and the binary writers are depth-bounded - FAQ: max_digits10 for serialization, trailing commas are supported - out_of_range.407 is still thrown by to_bon8 - FetchContent_MakeAvailable needs CMake 3.14 - json_fwd.hpp contents, operator< link, RFC 7396 for merge patch - README: dump() wording, merge_diff, MSYS2/build2, patch comment typos, operator[] link, embedded CMake example aligned with the docs Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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@@ -116,7 +116,7 @@ There is also a [**docset**](https://github.com/Kapeli/Dash-User-Contributions/t
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- **Constructors**: [basic_json](https://json.nlohmann.me/api/basic_json/basic_json), [array](https://json.nlohmann.me/api/basic_json/array), [binary](https://json.nlohmann.me/api/basic_json/binary), [object](https://json.nlohmann.me/api/basic_json/object)
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- **Object inspection**: [type](https://json.nlohmann.me/api/basic_json/type), [operator value_t](https://json.nlohmann.me/api/basic_json/operator_value_t), [type_name](https://json.nlohmann.me/api/basic_json/type_name), [is_primitive](https://json.nlohmann.me/api/basic_json/is_primitive), [is_structured](https://json.nlohmann.me/api/basic_json/is_structured), [is_null](https://json.nlohmann.me/api/basic_json/is_null), [is_boolean](https://json.nlohmann.me/api/basic_json/is_boolean), [is_number](https://json.nlohmann.me/api/basic_json/is_number), [is_number_integer](https://json.nlohmann.me/api/basic_json/is_number_integer), [is_number_unsigned](https://json.nlohmann.me/api/basic_json/is_number_unsigned), [is_number_float](https://json.nlohmann.me/api/basic_json/is_number_float), [is_object](https://json.nlohmann.me/api/basic_json/is_object), [is_array](https://json.nlohmann.me/api/basic_json/is_array), [is_string](https://json.nlohmann.me/api/basic_json/is_string), [is_binary](https://json.nlohmann.me/api/basic_json/is_binary), [is_discarded](https://json.nlohmann.me/api/basic_json/is_discarded)
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- **Value access**: [get](https://json.nlohmann.me/api/basic_json/get), [get_to](https://json.nlohmann.me/api/basic_json/get_to), [get_ptr](https://json.nlohmann.me/api/basic_json/get_ptr), [get_ref](https://json.nlohmann.me/api/basic_json/get_ref), [operator ValueType](https://json.nlohmann.me/api/basic_json/operator_ValueType), [get_binary](https://json.nlohmann.me/api/basic_json/get_binary)
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- **Element access**: [at](https://json.nlohmann.me/api/basic_json/at), [operator[]](https://json.nlohmann.me/api/basic_json/operator[]), [value](https://json.nlohmann.me/api/basic_json/value), [front](https://json.nlohmann.me/api/basic_json/front), [back](https://json.nlohmann.me/api/basic_json/back)
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- **Element access**: [at](https://json.nlohmann.me/api/basic_json/at), [operator[]](https://json.nlohmann.me/api/basic_json/operator%5B%5D/), [value](https://json.nlohmann.me/api/basic_json/value), [front](https://json.nlohmann.me/api/basic_json/front), [back](https://json.nlohmann.me/api/basic_json/back)
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- **Lookup**: [find](https://json.nlohmann.me/api/basic_json/find), [count](https://json.nlohmann.me/api/basic_json/count), [contains](https://json.nlohmann.me/api/basic_json/contains)
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- **Iterators**: [begin](https://json.nlohmann.me/api/basic_json/begin), [cbegin](https://json.nlohmann.me/api/basic_json/cbegin), [end](https://json.nlohmann.me/api/basic_json/end), [cend](https://json.nlohmann.me/api/basic_json/cend), [rbegin](https://json.nlohmann.me/api/basic_json/rbegin), [rend](https://json.nlohmann.me/api/basic_json/rend), [crbegin](https://json.nlohmann.me/api/basic_json/crbegin), [crend](https://json.nlohmann.me/api/basic_json/crend), [items](https://json.nlohmann.me/api/basic_json/items)
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- **Capacity**: [empty](https://json.nlohmann.me/api/basic_json/empty), [size](https://json.nlohmann.me/api/basic_json/size), [max_size](https://json.nlohmann.me/api/basic_json/max_size)
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@@ -125,7 +125,7 @@ There is also a [**docset**](https://github.com/Kapeli/Dash-User-Contributions/t
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- **Serialization / Dumping**: [dump](https://json.nlohmann.me/api/basic_json/dump)
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- **Deserialization / Parsing**: [parse](https://json.nlohmann.me/api/basic_json/parse), [accept](https://json.nlohmann.me/api/basic_json/accept), [sax_parse](https://json.nlohmann.me/api/basic_json/sax_parse)
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- **JSON Pointer functions**: [flatten](https://json.nlohmann.me/api/basic_json/flatten), [unflatten](https://json.nlohmann.me/api/basic_json/unflatten)
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- **JSON Patch functions**: [patch](https://json.nlohmann.me/api/basic_json/patch), [patch_inplace](https://json.nlohmann.me/api/basic_json/patch_inplace), [diff](https://json.nlohmann.me/api/basic_json/diff), [merge_patch](https://json.nlohmann.me/api/basic_json/merge_patch)
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- **JSON Patch functions**: [patch](https://json.nlohmann.me/api/basic_json/patch), [patch_inplace](https://json.nlohmann.me/api/basic_json/patch_inplace), [diff](https://json.nlohmann.me/api/basic_json/diff), [merge_patch](https://json.nlohmann.me/api/basic_json/merge_patch), [merge_diff](https://json.nlohmann.me/api/basic_json/merge_diff)
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- **Static functions**: [meta](https://json.nlohmann.me/api/basic_json/meta), [get_allocator](https://json.nlohmann.me/api/basic_json/get_allocator)
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- **Binary formats**: [from_bjdata](https://json.nlohmann.me/api/basic_json/from_bjdata), [from_bon8](https://json.nlohmann.me/api/basic_json/from_bon8), [from_bson](https://json.nlohmann.me/api/basic_json/from_bson), [from_cbor](https://json.nlohmann.me/api/basic_json/from_cbor), [from_msgpack](https://json.nlohmann.me/api/basic_json/from_msgpack), [from_ubjson](https://json.nlohmann.me/api/basic_json/from_ubjson), [to_bjdata](https://json.nlohmann.me/api/basic_json/to_bjdata), [to_bon8](https://json.nlohmann.me/api/basic_json/to_bon8), [to_bson](https://json.nlohmann.me/api/basic_json/to_bson), [to_cbor](https://json.nlohmann.me/api/basic_json/to_cbor), [to_msgpack](https://json.nlohmann.me/api/basic_json/to_msgpack), [to_ubjson](https://json.nlohmann.me/api/basic_json/to_ubjson)
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- **Non-member functions**: [operator<<](https://json.nlohmann.me/api/operator_ltlt/), [operator>>](https://json.nlohmann.me/api/operator_gtgt/), [to_string](https://json.nlohmann.me/api/basic_json/to_string)
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@@ -360,7 +360,7 @@ std::cout << cpp_string << " == " << cpp_string2 << " == " << j_string.get<std::
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std::cout << j_string << " == " << serialized_string << std::endl;
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```
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[`.dump()`](https://json.nlohmann.me/api/basic_json/dump/) returns the originally stored string value.
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[`.dump()`](https://json.nlohmann.me/api/basic_json/dump/) returns the serialized JSON text, so a string value is enclosed in quotes and special characters are escaped. Use [`get<std::string>()`](https://json.nlohmann.me/api/basic_json/get/) to retrieve the originally stored string value.
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Note the library only supports UTF-8. When you store strings with different encodings in the library, calling [`dump()`](https://json.nlohmann.me/api/basic_json/dump/) may throw an exception unless `json::error_handler_t::replace`, `json::error_handler_t::ignore`, or `json::error_handler_t::keep` are used as error handlers.
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@@ -687,15 +687,15 @@ json j_result = j_original.patch(j_patch);
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// calculate a JSON patch from two JSON values
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json::diff(j_result, j_original);
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// [
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// { "op":" replace", "path": "/baz", "value": ["one", "two", "three"] },
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// { "op": "remove","path": "/hello" },
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// { "op": "replace", "path": "/baz", "value": ["one", "two", "three"] },
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// { "op": "remove", "path": "/hello" },
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// { "op": "add", "path": "/foo", "value": "bar" }
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// ]
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```
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### JSON Merge Patch
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The library supports **JSON Merge Patch** ([RFC 7386](https://tools.ietf.org/html/rfc7386)) as a patch format. Instead of using JSON Pointer (see above) to specify values to be manipulated, it describes the changes using a syntax that closely mimics the document being modified.
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The library supports **JSON Merge Patch** ([RFC 7396](https://tools.ietf.org/html/rfc7396)) as a patch format. Instead of using JSON Pointer (see above) to specify values to be manipulated, it describes the changes using a syntax that closely mimics the document being modified.
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```cpp
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// a JSON value
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@@ -725,6 +725,20 @@ j_document.merge_patch(j_patch);
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// }
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```
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Conversely, [`merge_diff`](https://json.nlohmann.me/api/basic_json/merge_diff/) creates a merge patch from two JSON values:
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```cpp
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// create a merge patch that turns j_original into j_document
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json j_original = R"({"a": "b", "c": {"d": "e", "f": "g"}})"_json;
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json::merge_diff(j_original, j_document);
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// {
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// "a": "z",
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// "c": {
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// "f": null
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// }
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// }
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```
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### Implicit conversions
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Supported types can be implicitly converted to JSON values.
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@@ -1266,13 +1280,9 @@ The package configuration file, `nlohmann_jsonConfig.cmake`, can be used either
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To embed the library directly into an existing CMake project, place the entire source tree in a subdirectory and call `add_subdirectory()` in your `CMakeLists.txt` file:
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```cmake
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# Typically you don't care so much for a third party library's tests to be
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# run from your own project's code.
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set(JSON_BuildTests OFF CACHE INTERNAL "")
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# If you only include this third party in PRIVATE source files, you do not
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# need to install it when your main project gets installed.
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# set(JSON_Install OFF CACHE INTERNAL "")
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set(JSON_Install OFF CACHE INTERNAL "")
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# Don't use include(nlohmann_json/CMakeLists.txt) since that carries with it
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# unintended consequences that will break the build. It's generally
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@@ -1287,8 +1297,8 @@ target_link_libraries(foo PRIVATE nlohmann_json::nlohmann_json)
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##### Embedded (FetchContent)
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Since CMake v3.11,
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[FetchContent](https://cmake.org/cmake/help/v3.11/module/FetchContent.html) can
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Since CMake v3.14,
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[FetchContent](https://cmake.org/cmake/help/v3.14/module/FetchContent.html) can
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be used to automatically download a release as a dependency at configure time.
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Example:
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@@ -1353,7 +1363,9 @@ Use your favorite [**package manager**](https://json.nlohmann.me/integration/pac
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- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/swift.svg" height="20"> [**Swift Package Manager**](https://json.nlohmann.me/integration/package_managers/#swift-package-manager) `nlohmann/json`
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- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/nuget.svg" height="20"> [**Nuget**](https://json.nlohmann.me/integration/package_managers/#nuget) `nlohmann.json`
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- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/conda.svg" height="20"> [**Conda**](https://json.nlohmann.me/integration/package_managers/#conda) `nlohmann_json`
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- [**MSYS2**](https://json.nlohmann.me/integration/package_managers/#msys2) `mingw-w64-nlohmann-json`
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- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/macports.svg" height="20"> [**MacPorts**](https://json.nlohmann.me/integration/package_managers/#macports) `nlohmann-json`
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- [**build2**](https://json.nlohmann.me/integration/package_managers/#build2) `nlohmann-json`
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- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/CPM.png" height="20"> [**cpm.cmake**](https://json.nlohmann.me/integration/package_managers/#cpmcmake) `gh:nlohmann/json`
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- <img src="https://raw.githubusercontent.com/nlohmann/json/refs/heads/develop/docs/mkdocs/docs/images/package_managers/xmake.svg" height="20"> [**xmake**](https://json.nlohmann.me/integration/package_managers/#xmake) `nlohmann_json`
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