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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\fusion\sequence\intrinsic\begin.hpp

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/*=============================================================================
    Copyright (c) 2001-2006 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)
==============================================================================*/
#if !defined(FUSION_BEGIN_04052005_1132)
#define FUSION_BEGIN_04052005_1132

#include <boost/fusion/support/tag_of.hpp>

namespace boost { namespace fusion
{
    // Special tags:
    struct sequence_facade_tag; // iterator facade tag
    struct boost_tuple_tag; // boost::tuples::tuple tag
    struct array_tag; // boost::array tag
    struct mpl_sequence_tag; // mpl sequence tag
    struct std_pair_tag; // std::pair tag

    namespace extension
    {
        template <typename Tag>
        struct begin_impl
        {
            template <typename Sequence>
            struct apply;
        };

        template <>
        struct begin_impl<sequence_facade_tag>
        {
            template <typename Sequence>
            struct apply : Sequence::template begin<Sequence> {};
        };

        template <>
        struct begin_impl<boost_tuple_tag>;

        template <>
        struct begin_impl<array_tag>;

        template <>
        struct begin_impl<mpl_sequence_tag>;

        template <>
        struct begin_impl<std_pair_tag>;
    }

    namespace result_of
    {
        template <typename Sequence>
        struct begin
            : extension::begin_impl<typename detail::tag_of<Sequence>::type>::
                template apply<Sequence>
        {};
    }

    template <typename Sequence>
    inline typename result_of::begin<Sequence>::type const
    begin(Sequence& seq)
    {
        return result_of::begin<Sequence>::call(seq);
    }

    template <typename Sequence>
    inline typename result_of::begin<Sequence const>::type const
    begin(Sequence const& seq)
    {
        return result_of::begin<Sequence const>::call(seq);
    }
}}

#endif

begin.hpp

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