GL Profile Suite / boost_1_51_0 / boost / fusion / container / list / detail / next_impl.hpp

    Copyright (c) 2001-2011 Joel de Guzman
    Copyright (c) 2005 Eric Niebler

    Distributed under the Boost Software License, Version 1.0. (See accompanying 
    file LICENSE_1_0.txt or copy at
#if !defined(FUSION_NEXT_IMPL_07172005_0836)
#define FUSION_NEXT_IMPL_07172005_0836

#include <boost/fusion/iterator/next.hpp>
#include <boost/fusion/iterator/equal_to.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/add_const.hpp>

namespace boost { namespace fusion
    struct cons_iterator_tag;

    template <typename Cons>
    struct cons_iterator;

    namespace extension
        template <typename Tag>
        struct next_impl;

        template <>
        struct next_impl<cons_iterator_tag>
            template <typename Iterator>
            struct apply
                typedef typename Iterator::cons_type cons_type;
                typedef typename cons_type::cdr_type cdr_type;
                typedef cons_iterator<
                    typename mpl::eval_if<
                      , add_const<cdr_type>
                      , mpl::identity<cdr_type>
                static type
                call(Iterator const& i)
                    return type(i.cons.cdr);

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