next_traits.hpp

来自「CGAL is a collaborative effort of severa」· HPP 代码 · 共 50 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_ITERATOR_DETAIL_TRANSFORM_VIEW_ITERATOR_NEXT_TRAITS_HPP)
#define FUSION_ITERATOR_DETAIL_TRANSFORM_VIEW_ITERATOR_NEXT_TRAITS_HPP

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

namespace boost { namespace fusion
{
    struct transform_view_iterator_tag;

    template <typename First, typename F>
    struct transform_view_iterator;

    namespace meta
    {
        template <typename Tag>
        struct next_impl;

        template <>
        struct next_impl<transform_view_iterator_tag>
        {
            template <typename Iterator>
            struct apply
            {
                typedef typename Iterator::first_type first_type;
                typedef typename meta::next<first_type>::type next_type;
                typedef typename Iterator::transform_type transform_type;
                typedef transform_view_iterator<next_type, transform_type> type;

                static type
                call(Iterator const& i)
                {
                    return type(fusion::next(i.first), i.f);
                }
            };
        };
    }
}}

#endif