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>
#include <functional>
template<typename Iter, typename Callable, typename... Args>
void foreach (Iter current, Iter end, Callable op, Args const&... args)
{
while (current != end) { // as long as not reached the end of the elements
std::invoke(op, // call passed callable with
args..., // any additional args
*current); // and the current element
++current;
}
}