tuple1.cpp

C++_Templates这本书的随书源码

/* 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;
}