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Add mapped_t

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This commit is contained in:
Victor Zverovich 2024-09-01 17:48:29 -07:00
parent c9ef07bc4e
commit a86b1acf6a
1 changed files with 5 additions and 3 deletions
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8
include/fmt/base.h
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@ -2241,6 +2241,10 @@ template <typename Context> struct arg_mapper {
FMT_MAP_API auto map(...) -> unformattable { return {}; }
};
template <typename T, typename Char>
using mapped_t = decltype(detail::arg_mapper<buffered_context<Char>>::map(
std::declval<T&>()));
// A type constant after applying arg_mapper<Context>.
template <typename T, typename Context>
using mapped_type_constant =
@ -2909,9 +2913,7 @@ using format_string = basic_format_string<char, type_identity_t<T>...>;
template <typename T, typename Char = char>
using is_formattable = bool_constant<
!std::is_base_of<detail::unformattable,
decltype(detail::arg_mapper<buffered_context<Char>>::map(
std::declval<T&>()))>::value>;
!std::is_base_of<detail::unformattable, detail::mapped_t<T, Char>>::value>;
#ifdef __cpp_concepts
template <typename T, typename Char = char>