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Fix C++20/gcc-12 issues (Part 2) (#3446)

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* Add C++20 3-way comparison operator and fix broken comparisons

Fixes #3207.
Fixes #3409.

* Fix iterators to meet (more) std::ranges requirements

Fixes #3130.
Related discussion: #3408

* Add note about CMake standard version selection to unit tests

Document how CMake chooses which C++ standard version to use when
building tests.

* Update documentation

* CI: add legacy discarded value comparison

* Fix internal linkage errors when building a module
This commit is contained in:
Florian Albrechtskirchinger
2022-05-29 13:08:06 +02:00
committed by GitHub
parent ede6667858
commit 6b97599a27
35 changed files with 1963 additions and 690 deletions
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docs/mkdocs/docs/api/macros/json_has_ranges.md
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# JSON_HAS_RANGES
```cpp
#define JSON_HAS_RANGES /* value */
```
This macro indicates whether the standard library has any support for ranges. Implies support for concepts.
Possible values are `1` when supported or `0` when unsupported.
## Default definition
The default value is detected based on the preprocessor macro `#!cpp __cpp_lib_ranges`.
When the macro is not defined, the library will define it to its default value.
## Version history
- Added in version 3.11.0.