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:
-
fif cv ref is either empty or&, or -
std::as_const(f)if cv ref is eitherconstorconst &, or -
std::move(f)if cv ref is&&, or -
std::move(std::as_const(f))if cv ref isconst &&.
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
See also
| invokes the target (public member function of std::function<R(Args...)>) |
|
| invokes the target (public member function of std::move_only_function) |
|
| calls the stored function (public member function of std::reference_wrapper<T>) |
|
|
(C++17)(C++23) | invokes any Callable object with given arguments and possibility to specify return type(since C++23) (function template) |
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https://en.cppreference.com/cpp/utility/functional/copyable_function/operator()
