Add fmt/reflect.h and format enums annotated with fmt::as_identifiers - #4885
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Add fmt/reflect.h and format enums annotated with fmt::as_identifiers#4885avikivity wants to merge 1 commit into
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Format an enum as the identifier of the matching enumerator if the enum is
annotated with fmt::as_identifiers:
enum class [[=fmt::as_identifiers]] color { red, green, blue };
fmt::format("{}", color::green); // "green"
Identifiers are retrieved via C++26 reflection (P2996) and the annotation
via P3394. FMT_USE_REFLECTION is autodetected and can be overridden by the
user; without reflection the header is empty.
Values that don't match any enumerator are formatted as values of the
underlying type.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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v2: apply cmake-format |
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Format an enum as the identifier of the matching enumerator if the enum is annotated with fmt::as_identifiers:
enum class [[=fmt::as_identifiers]] color { red, green, blue };
fmt::format("{}", color::green); // "green"
Identifiers are retrieved via C++26 reflection (P2996) and the annotation via P3394. FMT_USE_REFLECTION is autodetected and can be overridden by the user; without reflection the header is empty.
Values that don't match any enumerator are formatted as values of the underlying type.