std::basic_format_args(3) C++ Standard Libary std::basic_format_args(3) NAME std::basic_format_args - std::basic_format_args Synopsis Defined in header <format> template< class Context > (1) (since C++20) class basic_format_args; using format_args = basic_format_args<std::format_context>; (2) (since C++20) using wformat_args = basic_format_args<std::wformat_context>; (3) (since C++20) Provides access to formatting arguments. Member functions constructor constructs a basic_format_args object (public member function) get returns formatting argument at the given index (public member function) std::basic_format_args::basic_format_args basic_format_args() noexcept; (1) template< class... Args > basic_format_args( const /*format-arg-store*/<Context, Args...>& store ) (2) noexcept; 1) Constructs a basic_format_args object that does not hold any format- ting argument. 2) Constructs a basic_format_args object from the result of a call to std::make_format_args or std::make_wformat_args. std::basic_format_args has reference semantics. It is the programmer's responsibility to ensure that *this does not outlive store (which, in turn, should not outlive the arguments to std::make_format_args or std::make_wfor- mat_args). std::basic_format_args::get std::basic_format_arg<Context> get( std::size_t i ) const noexcept; Returns a std::basic_format_arg holding the i-th argument in args, where args is the parameter pack passed to std::make_format_args or std::make_wfor- mat_args. If there's no such formatting argument (i.e. *this was default-con- structed or i is not less than the number of formatting arguments), returns a default- constructed std::basic_format_arg (holding a std::monostate object). Deduction guides template< class Context, class... Args > basic_format_args( /*format-arg-store*/<Context, Args...> ) -> (since C++20) basic_format_args<Context>; Example This section is incomplete Reason: no example Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior P2216R3 C++20 format_args_t was provided due to re- moved overparameterization of vformat_to LWG3810 C++20 basic_format_args has no deduction guide added See also basic_format_arg class template that provides access to a formatting ar- gument for (C++20) user-defined formatters (class template) Category: * Todo no example http://cppreference.com 2024.06.10 std::basic_format_args(3)
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