The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017
#include <utility> // for std::invoke()
#include <functional> // for std::forward()
template<typename Callable, typename... Args>
decltype(auto) call(Callable&& op, Args&&... args)
{
return std::invoke(std::forward<Callable>(op), // passed callable with
std::forward<Args>(args)...); // any additional args
}