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Showing content from https://en.cppreference.com/w/cpp/algorithm/../utility/functional/copyable_function/operator().html below:

std::copyable_function::operator() - cppreference.com

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.

[edit] Parameters args - parameters to pass to the stored callable target [edit] Return value

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

[edit] Exceptions

Propagates the exception thrown by the underlying function call.

[edit] Example [edit] See also invokes the target
(public member function of std::function<R(Args...)>) [edit] invokes the target
(public member function of std::move_only_function) [edit] calls the stored function
(public member function of std::reference_wrapper<T>) [edit] invokes any Callable object with given arguments and possibility to specify return type(since C++23)
(function template) [edit]

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