transform_view_tests.cpp

C++的一个好库。。。现在很流行

/*=============================================================================
    Copyright (c) 2003 Joel de Guzman

    Use, modification and distribution is subject to 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 <boost/detail/lightweight_test.hpp>
#include <boost/spirit/fusion/sequence/tuple.hpp>
#include <boost/spirit/fusion/sequence/io.hpp>
#include <boost/spirit/fusion/sequence/make_tuple.hpp>
#include <boost/spirit/fusion/sequence/equal_to.hpp>
#include <boost/spirit/fusion/sequence/transform_view.hpp>
#include <boost/spirit/fusion/sequence/type_sequence.hpp>
#include <boost/mpl/range_c.hpp>

struct square
{
    template <typename T>
    struct apply
    {
        typedef int type;
    };

    template <typename T>
    int operator()(T x) const
    {
        return x * x;
    }
};

int
main()
{
    using namespace boost::fusion;

    std::cout << tuple_open('[');
    std::cout << tuple_close(']');
    std::cout << tuple_delimiter(", ");

/// Testing the transform_view

    {
        typedef boost::mpl::range_c<int, 5, 9> mpl_list1;
        typedef type_sequence<mpl_list1> sequence_type;
        sequence_type sequence;
        transform_view<sequence_type, square> xform(sequence, square());

        std::cout << xform << std::endl;
        BOOST_TEST((xform == make_tuple(25, 36, 49, 64)));
    }

    return boost::report_errors();
}