std::copyable_function:: operator()

R operator ( ) ( Args... args ) /*cv*/ /*ref*/ noexcept ( /*noex*/ ) ;		(since C++26)

Invokes the stored callable target with the parameters args . The /*cv*/ , /*ref*/ , and /*noex*/ parts of operator ( ) are identical to those of the template parameter of std::copyable_function .

Equivalent to return std:: invoke_r < R > ( /*cv-ref-cast*/ ( f ) , std:: forward < Args > ( args ) ... ) ; , where f is a cv-unqualified lvalue that denotes the target object of * this , and /*cv-ref-cast*/ ( f ) is equivalent to:

• f if cv ref is either empty or & , or
• std:: as_const ( f ) if cv ref is either const or const & , or
• std :: move ( f ) if cv ref is && , or
• std :: move ( std:: as_const ( f ) ) if cv ref is const && .

The behavior is undefined if * this is empty.

Parameters

args

-

parameters to pass to the stored callable target

Return value

std:: invoke_r < R > ( /*cv-ref-cast*/ ( f ) , std:: forward < Args > ( args ) ... ) .

Exceptions

Propagates the exception thrown by the underlying function call.

Example

This section is incomplete Reason: no example

See also

operator()	invokes the target (public member function of std::function<R(Args...)> )
operator()	invokes the target (public member function of std::move_only_function )
operator()	calls the stored function (public member function of std::reference_wrapper<T> )
invoke invoke_r (C++17) (C++23)	invokes any Callable object with given arguments and possibility to specify return type (since C++23) (function template)