27 lines
1.4 KiB
Markdown
27 lines
1.4 KiB
Markdown
# v3.12.0
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Released on 2025-04-11.
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Fixes bugs found in 3.11.3 and adds several features. No public API was removed or renamed.
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- Adds diagnostic byte positions via [`JSON_DIAGNOSTIC_POSITIONS`](../../api/macros/json_diagnostic_positions.md),
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exposed through the new [`start_pos`](../../api/basic_json/start_pos.md) and
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[`end_pos`](../../api/basic_json/end_pos.md) member functions.
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- Makes the [conversion macros](../../features/arbitrary_types.md#simplify-your-life-with-macros)
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templated (so they also work with [`ordered_json`](../../api/ordered_json.md)) and adds
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[`NLOHMANN_DEFINE_DERIVED_TYPE`](../../api/macros/nlohmann_define_derived_type.md) for derived classes.
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- Adds `std::optional` support (C++17) and lets [`patch`](../../api/basic_json/patch.md),
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[`diff`](../../api/basic_json/diff.md), and [`flatten`](../../api/basic_json/flatten.md) work with
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arbitrary string types.
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- Extends the [binary formats](../../features/binary_formats/index.md):
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[BJData](../../features/binary_formats/bjdata.md) draft 3 and unsigned 64-bit integers for
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[BSON](../../features/binary_formats/bson.md).
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- Adds multidimensional C-array conversion and UTF-8 encoded `std::filesystem::path` conversions, and
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raises the minimum [CMake](../../integration/cmake.md) version to 3.5 and supports CMake 4.0.
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[Full release notes](https://github.com/nlohmann/json/releases/tag/v3.12.0).
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## API changes
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<!-- api-changes -->
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