std::experimental::ranges::invoke

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).

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