range_begin_end_traits.hpp

来自「CGAL is a collaborative effort of severa」· HPP 代码 · 共 85 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)
==============================================================================*/
#if !defined(FUSION_SEQUENCE_DETAIL_RANGE_BEGIN_END_TRAITS_HPP)
#define FUSION_SEQUENCE_DETAIL_RANGE_BEGIN_END_TRAITS_HPP

#include <boost/spirit/fusion/detail/config.hpp>

namespace boost { namespace fusion
{
    struct range_tag;

    template <typename First, typename Last>
    struct range;

    template <typename Tag>
    struct begin_impl;

    namespace meta
    {
        template <typename Tag>
        struct begin_impl;

        template <>
        struct begin_impl<range_tag>
        {
            template <typename Sequence>
            struct apply
            {
                typedef typename Sequence::begin_type type;

                static type
                call(Sequence const& s)
                {
                    return s.first;
                }
            };
        };

        template <typename Tag>
        struct end_impl;

        template <>
        struct end_impl<range_tag>
        {
            template <typename Sequence>
            struct apply
            {
                typedef typename Sequence::end_type type;

                static type
                call(Sequence const& s)
                {
                    return s.last;
                }
            };
        };
    }
}}

namespace boost { namespace mpl
{
    template <typename Tag>
    struct begin_impl;

    template <typename Tag>
    struct end_impl;

    template <>
    struct begin_impl<fusion::range_tag>
        : fusion::meta::begin_impl<fusion::range_tag> {};

    template <>
    struct end_impl<fusion::range_tag>
        : fusion::meta::end_impl<fusion::range_tag> {};
}}

#endif