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: / usr / include / boost / fusion / view / nview / detail /
Filename : size_impl.hpp
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/*=============================================================================
    Copyright (c) 2001-2011 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_NVIEW_SIZE_IMPL_OCT_06_2009_0525PM)
#define FUSION_NVIEW_SIZE_IMPL_OCT_06_2009_0525PM

#include <boost/fusion/support/config.hpp>
#include <boost/fusion/iterator/distance.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>

namespace boost { namespace fusion
{
    struct nview_tag;

    namespace extension
    {
        template <typename Tag>
        struct size_impl;

        template <>
        struct size_impl<nview_tag>
        {
            template <typename Sequence>
            struct apply
                : result_of::distance<
                    typename result_of::begin<Sequence>::type
                  , typename result_of::end<Sequence>::type>
            {};
        };
    }
}}

#endif