The following code example is taken from the book
C++17 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2017
The code is licensed under a Creative Commons Attribution 4.0 International License. Creative Commons License

// raw code

#include <utility>     // for std::invoke()
#include <functional>  // for std::forward()

template<typename Callable, typename... Args>
void call(Callable&& op, Args&&... args)
  std::invoke(std::forward<Callable>(op),    // call passed callable with
              std::forward<Args>(args)...);  // all additional passed args