std::experimental::ranges::invoke

 

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Defined in header <experimental/ranges/functional>
template< class F, class... Args > std::result_of_t<F&&(Args&&...)> invoke( F&& f, Args&&... args );		(ranges TS)

Invoke the Callable object f with the parameters args, and return the result, as if by return INVOKE(std::forward<F>(f), std::forward<Args>(args)...);, where INVOKE(f, t1, t2, ..., tN) is defined as follows:

• if f is a pointer to member function of class T:

• If std::is_base_of<T, std::decay_t<decltype(t1)>>::value is true, then INVOKE(f, t1, t2, ..., tN) is equivalent to (t1.*f)(t2, ..., tN),
• otherwise, INVOKE(f, t1, t2, ..., tN) is equivalent to ((*t1).*f)(t2, ..., tN).

• otherwise, if N == 1 and f is a pointer to data member of class T:

• If std::is_base_of<T, std::decay_t<decltype(t1)>>::value is true, then INVOKE(f, t1) is equivalent to t1.*f,
• otherwise, then INVOKE(f, t1) is equivalent to (*t1).*f.

• otherwise, INVOKE(f, t1, t2, ..., tN) is equivalent to f(t1, t2, ..., tN) (that is, f is a FunctionObject).

Parameters

f	-	Callable object to be invoked
args	-	arguments to pass to f

See also

invokeinvoke_r (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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