/* 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 "tuple1.hpp"#include <iostream>int main(){    // create and use tuple with only one field    Tuple<int> t1;    val<1>(t1) += 42;    std::cout << t1.v1() << std::endl;    // create and use duo    Tuple<bool,int> t2;    std::cout << val<1>(t2) << ", ";    std::cout << t2.v1() << std::endl;    // create and use triple    Tuple<bool,int,double> t3;    val<1>(t3) = true;    val<2>(t3) = 42;    val<3>(t3) = 0.2;    std::cout << val<1>(t3) << ", ";    std::cout << val<2>(t3) << ", ";    std::cout << val<3>(t3) << std::endl;    t3 = make_tuple(false, 23, 13.13);    std::cout << val<1>(t3) << ", ";    std::cout << val<2>(t3) << ", ";    std::cout << val<3>(t3) << std::endl;    // create and use quadruple    Tuple<bool,int,float,double> t4(true,42,13,1.95583);    std::cout << val<4>(t4) << std::endl;    std::cout << t4.v2().v2().v2() << std::endl;}