# std::experimental::ranges::invoke

From cppreference.com
< cpp‎ | experimental‎ | ranges

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

invoke (C++17) | invokes any Callable object with given arguments (function template)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/experimental/ranges/functional/invoke&oldid=103438"