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Use fmt::formatter specialization for std::reference_wrapper to avoid undefined behavior (#4164)

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Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
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Vladislav Shchapov 2024-09-19 22:34:33 +05:00 committed by GitHub
parent ed8f8be70d
commit 1f87b1c58d
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1 changed files with 12 additions and 10 deletions
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22
include/fmt/std.h
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@ -692,15 +692,17 @@ template <typename T, typename Char> struct formatter<std::complex<T>, Char> {
}
};
FMT_EXPORT
template <typename T, typename Char>
struct formatter<std::reference_wrapper<T>, Char,
enable_if_t<is_formattable<remove_cvref_t<T>, Char>::value>>
: formatter<remove_cvref_t<T>, Char> {
template <typename FormatContext>
auto format(std::reference_wrapper<T> ref, FormatContext& ctx) const
-> decltype(ctx.out()) {
return formatter<remove_cvref_t<T>, Char>::format(ref.get(), ctx);
}
};
FMT_END_NAMESPACE
namespace std {
template <typename T>
constexpr auto format_as(std::reference_wrapper<T> ref) -> T& {
return ref.get();
}
} // namespace std
#endif // FMT_STD_H_