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std::enable...optimization(3) C++ Standard Libarystd::enable...optimization(3) NAME std::enable_nonlocking_formatter_optimization - std::enable_nonlock- ing_formatter_optimization Synopsis Defined in header <format> template< class T > (since C++23) constexpr bool enable_nonlocking_formatter_optimization = false; This template can be used by implementations to enable efficient im- plementations of std::print and std::println. If std::enable_nonlocking_formatter_optimization<T> is true, print- ing an argument of type T can be performed in a more efficient way (see std::print for details). std::enable_nonlocking_formatter_optimization specializations can be true in the following cases: * T is one of the types where std::format<T, CharT> is a basic standard specialization (see below). * A program may specialize this template for any cv-unqualified program-defined type T. Such specializations must be usable in constant expres- sions and have type const bool. Basic standard specializations In the following list, CharT is either char or wchar_t, ArithmeticT is any cv-unqualified arithmetic type other than char, wchar_t, char8_t, char16_t, or char32_t: Nonlocking flag for character formatters template<> (1) inline constexpr bool enable_nonlocking_formatter_optimiza- tion<CharT> = true; Nonlocking flag for string formatters template<> (2) inline constexpr bool enable_nonlocking_formatter_optimiza- tion<CharT*> = true; template<> inline constexpr bool enable_nonlocking_formatter_optimization<const CharT*> = (3) true; template< std::size_t N > inline constexpr bool enable_nonlocking_formatter_optimiza- tion<CharT[N]> = (4) true; template< class Traits, class Alloc > inline constexpr bool enable_nonlocking_formatter_optimization (5) <std::basic_string<CharT, Traits, Alloc>> = true; template< class Traits > inline constexpr bool enable_nonlocking_formatter_optimization (6) <std::basic_string_view<CharT, Traits>> = true; Nonlocking flag for arithmetic formatters template<> inline constexpr bool enable_nonlocking_formatter_optimiza- tion<ArithmeticT> = (7) true; Nonlocking flag for pointer formatters template<> inline constexpr bool enable_nonlocking_formatter_optimiza- tion<std::nullptr_t> (8) = true; template<> (9) inline constexpr bool enable_nonlocking_formatter_optimiza- tion<void*> = true; template<> inline constexpr bool enable_nonlocking_formatter_optimization<const void*> = (10) true; See also formatter defines formatting rules for a given type (C++20) (class template) print prints to stdout or a file stream using formatted repre- sentation of the (C++23) arguments (function template) println same as std::print except that each print is terminated by additional new (C++23) line (function template) http://cppreference.com 2024.06.10 std::enable...optimization(3)
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