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std::basic_format_arg - cppreference.com

template< class Context > class basic_format_arg;

(since C++20)

Provides access to a formatting argument.

basic_format_arg objects are typically created by std::make_format_args and accessed through std::visit_format_arg or the visit member functions(since C++26).

A basic_format_arg object behaves as if it contains a std::variant of the following types:

std::monostate (only if the object was default-constructed)
bool
Context::char_type
int
unsigned int
long long int
unsigned long long int
float
double
long double
const Context::char_type*
std::basic_string_view<Context::char_type>
const void*
basic_format_arg::handle

[edit] Member classes type-erased wrapper that allows formatting an object of user-defined type
(public member class) [edit] Member functions constructs a std::basic_format_arg
(public member function) checks if the current object holds a formatting argument
(public member function) visit the contained formatting argument
(public member function) [edit] Non-member functions

(C++20) (deprecated in C++26)

argument visitation interface for user-defined formatters
(function template) [edit] std::basic_format_arg::basic_format_arg

basic_format_arg() noexcept;

(since C++20)

Default constructor. Constructs a basic_format_arg that does not hold a formatting argument. The contained object has type std::monostate.

To create a basic_format_arg that holds a formatting argument, std::make_format_args has to be used.

std::basic_format_arg::operator bool

explicit operator bool() const noexcept;

(since C++20)

Checks whether *this holds a formatting argument.

Returns true if *this holds a formatting argument (i.e. the contained object does not have type std::monostate), false otherwise.

std::basic_format_arg::visit

template< class Visitor > decltype(auto) visit( this basic_format_arg arg, Visitor&& vis );

(1) (since C++26)

template< class R, class Visitor > R visit( this basic_format_arg arg, Visitor&& vis );

(2) (since C++26)

Applies the visitor vis to the object contained in arg.

The visit functions do not modify the basic_format_arg object on which it is called because a copy of the object is used when calling vis.

[edit] Notes [edit] Example [edit] See also

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