/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include "apply2.hpp"#include <iostream>void incr (int& a) {     ++a; }void print (int a) {    std::cout << a << std::endl;}int main(){    int x = 7;    apply (x, incr);    apply (x, print);}