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std::formattable(3) C++ Standard Libary std::formattable(3) NAME std::formattable - std::formattable Synopsis Defined in header <format> template< class T, class CharT > concept formattable = /* formattable_with */< std::remove_reference_t<T>, (1) (since C++23) std::basic_format_context</* fmt_iter_for */<CharT>, CharT> >; Helper templates template< class CharT > (2) (exposition only*) using /* fmt_iter_for */ = /* unspecified */; template< class T, class Context, class Formatter = typename Context::template formatter_type<std::remove_const_t<T>> > concept /* formattable_with */ = std::semiregular<Formatter> && requires (Formatter& f, const Formatter& cf, T&& t, Context fc, (3) (exposition only*) std::basic_format_parse_context< typename Context::char_type > pc) { { f.parse(pc) } -> std::same_as<typename decltype(pc)::iterator>; { cf.format(t, fc) } -> std::same_as<typename Context::iterator>; }; The concept formattable specifies that std::formatter<std::re- move_cvref_t<T>, CharT> meets the requirements of BasicFormatter and Formatter (if std::remove_reference_t<T> is const-qualified). The exposition-only alias template /* fmt_iter_for */ yields an un- specified type that satisfies std::output_iterator<const CharT&>. Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 3925 C++23 the second template argument of provided std::basic_format_context was not provided See also formatter defines formatting rules for a given type (C++20) (class template) BasicFormatter abstracts formatting operations for a given format- ting argument type (C++20) and character type (named requirement) Formatter defines functions used by the formatting library (C++20) (named requirement) http://cppreference.com 2024.06.10 std::formattable(3)
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