duo5.cpp

C++ Templates 完全导引范例

/* 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 "duo1.hpp"
#include "duo2.hpp"
#include "duo3.hpp"
#include "duo4.hpp"
#include "duo5.hpp"
#include <iostream>

int main()
{
    // create and use simple duo
    Duo<bool,int> d;
    std::cout << d.v1() << std::endl;
    std::cout << val<1>(d) << std::endl;

    // create and use triple
    Duo<bool,Duo<int,float> > t;

    val<1>(t) = true;
    val<2>(t) = 42;
    val<3>(t) = 0.2;

    std::cout << val<1>(t) << std::endl;
    std::cout << val<2>(t) << std::endl;
    std::cout << val<3>(t) << std::endl;
}