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Document JSON_USE_SIMDUTF on the macro overview page

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The macro was only listed in the API macro index; add it to the supported
macros overview alongside the other JSON_USE_* macros, and note that it
selects between two definitions of the same inline function and so must be
defined identically in every translation unit.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann
2026-08-31 23:25:02 +02:00
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docs/mkdocs/docs/features/macros.md
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@@ -137,6 +137,14 @@ behavior is deprecated and switched off (`0`) by default.
See [full documentation of `JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON`](../api/macros/json_use_legacy_discarded_value_comparison.md).
## `JSON_USE_SIMDUTF`
When defined, UTF-8 validation of JSON strings read from contiguous byte input is delegated to the
[simdutf](https://github.com/simdutf/simdutf) library instead of the built-in scalar validator. This is an opt-in
external dependency and is not defined by default.
See [full documentation of `JSON_USE_SIMDUTF`](../api/macros/json_use_simdutf.md).
## `NLOHMANN_DEFINE_TYPE_*(...)`, `NLOHMANN_DEFINE_DERIVED_TYPE_*(...)`
The library defines 12 macros to simplify the serialization/deserialization of types. See the page on