std::experimental::ranges::invoke

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Technical specifications
Filesystem library (filesystem TS)
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invoke
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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 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).
  • 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

(C++17)(C++23)
invokes any Callable object with given arguments and possibility to specify return type (since C++23)
(function template)