for_each_s.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 83 行

/*=============================================================================
    Copyright (c) 2001-2006 Joel de Guzman, Eric Niebler

    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 <boost/detail/lightweight_test.hpp>
#include <boost/fusion/container/vector/vector.hpp>
#include <boost/fusion/adapted/mpl.hpp>
#include <boost/fusion/sequence/io/out.hpp>
#include <boost/fusion/algorithm/iteration/ext_/for_each_s.hpp>
#include <boost/mpl/vector_c.hpp>
#include <boost/fusion/container/generation/make_vector.hpp>
#include <boost/fusion/container/ext_/tree.hpp>

struct print
{
    template <typename T>
    void operator()(T const& v) const
    {
        std::cout << "[ " << v << " ] ";
    }
};

struct increment
{
    template <typename T>
    void operator()(T& v) const
    {
        ++v;
    }
};

int
main()
{
    using namespace boost::fusion;
    using boost::mpl::vector_c;
    namespace fusion = boost::fusion;

    {
        typedef vector<int, char, double, char const*> vector_type;
        vector_type v(1, 'x', 3.3, "Ruby");
        for_each_s(v, print());
        std::cout << std::endl;
    }

    {
        typedef vector<int, char, double, char const*> vector_type;
        vector_type v(1, 'x', 3.3, "Ruby");
        for_each_s(v, increment());
        std::cout << v << std::endl;
    }

    {
        typedef vector_c<int, 2, 3, 4, 5, 6> mpl_vec;
        fusion::for_each_s(mpl_vec(), print());
        std::cout << std::endl;
    }

    {
        fusion::for_each_s(
            make_tree(
                make_vector(double(0),'B')
              , make_tree(
                    make_vector(1,2,long(3))
                  , make_tree(make_vector('a','b','c'))
                  , make_tree(make_vector(short('d'),'e','f'))
                )
              , make_tree(
                    make_vector(4,5,6)
                  , make_tree(make_vector(float(1),'h','i'))
                  , make_tree(make_vector('j','k','l'))
                )
            )
          , print()
        );
    }

    return boost::report_errors();
}