/*=============================================================================
    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 http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#if !defined(FUSION_BEGIN_IMPL_07172005_0824)
#define FUSION_BEGIN_IMPL_07172005_0824

#include <boost/fusion/support/config.hpp>
#include <boost/mpl/if.hpp>
#include <boost/type_traits/is_const.hpp>

namespace boost {
namespace fusion {
struct nil_;

struct cons_tag;

template <typename Car, typename Cdr>
struct cons;

template <typename Cons>
struct cons_iterator;

namespace extension {
template <typename Tag>
struct begin_impl;

template <>
struct begin_impl<cons_tag>
{
    template <typename Sequence>
    struct apply
    {
        typedef cons_iterator<Sequence> type;

        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
        static type
        call(Sequence& t)
        {
            return type(t);
        }
    };
};
}
}
}

#endif
