Bump nlohmann_json from 3.11.3.bcr.1 to 3.12.0.bcr.1

[dependabot]

Bumps nlohmann_json from 3.11.3.bcr.1 to 3.12.0.bcr.1.

Release notes

Sourced from nlohmann_json's releases.

JSON for Modern C++ version 3.12.0

Release date: 2025-04-11 SHA-256: aaf127c04cb31c406e5b04a63f1ae89369fccde6d8fa7cdda1ed4f32dfc5de63 (json.hpp), b8cb0ef2dd7f57f18933997c9934bb1fa962594f701cd5a8d3c2c80541559372 (include.zip), 42f6e95cad6ec532fd372391373363b62a14af6d771056dbfc86160e6dfff7aa (json.tar.xz)

Summary

This release fixes some bugs found in the 3.11.3 release and adds some new features.

All changes are backward-compatible.

💰 Note you can support this project via GitHub sponsors or PayPal.

Key updates and enhancements

• Diagnostic byte positions: A new macro, JSON_DIAGNOSTIC_POSITIONS, introduces member functions to query the byte positions of values in the input they were parsed from. When enabled, this information is also included in exceptions to help pinpoint errors. #4517 #4455 #4570 #4569 #4572 #4571 #4579 #4585 #4561
• Enhanced conversion macros: The conversion macros for arbitrary types now include several upgrades:
  • All macros are templated, supporting json, ordered_json, and any other basic_json specialization. #4597 #2528 #4377 #2532 #2843 #3810 #4608
  • Derived classes can now be seamlessly converted to/from JSON using the new NLOHMANN_DEFINE_DERIVED_TYPE_* macros. #4033 #2199 #4562
• Support for std::optional: The library now supports conversions from/to std::optional types when compiled with C++17. #1749 #4036
• Flexible string compatibility: Functions patch, diff, and flatten now work with arbitrary string types. #4536 #4134 #4613 #4019
• Binary format enhancements:
  • The BJData mapping now supports draft 3, including optimized binary array types. #4513 #4588
  • The BSON mapping has added support for unsigned 64-bit integers. #4590 #4535 #3894
  • The get_number function used in the binary format implementations has been optimized to read multiple bytes at once. #4391
• Multidimensional array conversion: Multidimensional C-style arrays can now be directly converted to JSON. #4262 #4248
• Filesystem paths in UTF-8: The conversions from/to std::filesystem::path are now encoded to UTF-8 strings by default on all operating systems. #4271 #4631
• CMake 4.0 support. By adjusting the CMake minimal version to 3.5, CMake 4.0 can be used without warning or error. #4709

Changes and fixes

• The iteration_proxy is now a std::forward_iterator instead of just an std::input_iterator. This allows more use cases when items() is fed into C++20 std::views. The iterator always satisfied all requirements for a forward iterator, but was exposed as only an input iterator by the used iterator tag. #4371 #4372
• Fix the conversion from enums with unsigned underlying type to JSON. #4236 #4237
• Fix GDB pretty printer which was broken since m_data added. #4343 #4309
• Update natvis to reflect 3.11.3 and the current structure of basic_json. #4451 #4438 #4438
• Fix crash when passing nullptr to parse function expecting FILE*. Instead, now an exception is thrown. #4485 #4487
• Fix number parsing such that integers are not parsed to float when EINTR set in errno. #4506
• Fix SAX output of number_float to be locale-independent. #4505 #4084
• Fix iterators to allow comparing default-initialized iterators. #4512 #4493
• Fix return value of get_ptr for unsigned integers. #4525 #4475
• Fix regression of #2755 and replace EOF with char_traits. #4532
• Fix extended diagnostics to not trigger an assertion. #4537 #3915
• Fix NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT throw an exception with an empty json #4507 #4508
• Modernize integer comparison. #4577 #4559
• Serialize empty tuple into [] instead of null. #4594 #4530

Warnings

The quality assurance page gives an overview of the warning flags used during the tests.

Compiler warnings

... (truncated)

Commits

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