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Showing content from https://en.cppreference.com/w/cpp/language/../utility/format/basic_format_args.html below:

std::basic_format_args - cppreference.com

template< class Context > class basic_format_args;

(1) (since C++20) (2) (since C++20) (3) (since C++20)

Provides access to formatting arguments.

[edit] Member functions constructs a basic_format_args object
(public member function) returns formatting argument at the given index
(public member function) std::basic_format_args::basic_format_args

template< class... Args > basic_format_args( const /*format-arg-store*/<Context, Args...>& store ) noexcept;

Constructs a basic_format_args object from the result of a call to std::make_format_args or std::make_wformat_args.

[edit] Deduction guides

template< class Context, class... Args > basic_format_args( /*format-arg-store*/<Context, Args...> ) -> basic_format_args<Context>;

(since C++20) [edit] Notes

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_wformat_args).

[edit] Example [edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior P2216R3 C++20 format_args_t was provided due to overparameterization of vformat_to removed LWG 3810 C++20 basic_format_args has no deduction guide added LWG 4106 C++20 basic_format_args was default-constructible default constructor removed [edit] See also class template that provides access to a formatting argument for user-defined formatters
(class template) [edit]

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