boost/fusion/algorithm/transformation/filter_if.hpp

/*=============================================================================
    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_FILTER_IF_07172005_0818)
#define FUSION_FILTER_IF_07172005_0818
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/view/filter_view/filter_view.hpp>
namespace boost { namespace fusion
{
    namespace result_of
    {
        template <typename Sequence, typename Pred>
        struct filter_if
        {
            typedef filter_view<Sequence, Pred> type;
        };
    }
    template <typename Pred, typename Sequence>
    BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
    inline typename result_of::filter_if<Sequence const, Pred>::type
    filter_if(Sequence const& seq)
    {
        return filter_view<Sequence const, Pred>(seq);
    }
}}
#endif