The following code example is taken from the book
C++ Move Semantics - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2020
The code is licensed under a Creative Commons Attribution 4.0 International License. Creative Commons License

// raw code

#include <utility>  // for forward<>()

template <typename Func, typename... Args>
decltype(auto) call (Func f, Args&&... args)
  return f(std::forward<Args>(args)...);