switch_tests.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 70 行

/*=============================================================================
    Copyright (c) 2001-2007 Joel de Guzman

    Distributed under the Boost Software License, Version 1.0. (See accompanying 
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#include <iostream>
#include <vector>
#include <algorithm>
#include <boost/detail/lightweight_test.hpp>
#include <boost/spirit/include/phoenix_statement.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_core.hpp>

using namespace boost::phoenix;
using namespace boost::phoenix::arg_names;
using namespace std;

int
main()
{
    int init[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    vector<int> v(init, init+10);

    for_each(v.begin(), v.end(),
        switch_(_1)
        [
            // wierd case, why not just use if(...), but valid, nonetheless
            case_<4>(cout << val("<4>") << endl)
        ]
    );

    cout << endl;

    for_each(v.begin(), v.end(),
        switch_(_1)
        [
            // wierd case, but valid, nonetheless
            default_(cout << val("<any...>") << endl)
        ]
    );

    cout << endl;

    for_each(v.begin(), v.end(),
        switch_(_1)
        [
            case_<1>(cout << val("<1>") << endl),
            case_<2>(cout << val("<2>") << endl),
            case_<3>(cout << val("<3>") << endl),
            case_<4>(cout << val("<4>") << endl)
        ]
    );

    cout << endl;

    for_each(v.begin(), v.end(),
        switch_(_1)
        [
            case_<1>(cout << val("<1>") << endl),
            case_<2>(cout << val("<2>") << endl),
            case_<3>(cout << val("<3>") << endl),
            case_<4>(cout << val("<4>") << endl),
            default_(cout << val("<over 4>") << endl)
        ]
    );

    return boost::report_errors();
}