find_if.hpp

来自「Boost provides free peer-reviewed portab」· HPP 代码 · 共 70 行

/*=============================================================================
    Copyright (c) 2001-2006 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_FIND_IF_05052005_1108)
#define FUSION_FIND_IF_05052005_1108

#include <boost/fusion/algorithm/query/detail/find_if.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_const.hpp>

namespace boost { namespace fusion
{
    namespace result_of
    {
        template <typename Sequence, typename Pred>
        struct find_if
        {
            typedef typename
                detail::static_find_if<
                    typename result_of::begin<Sequence>::type
                  , typename result_of::end<Sequence>::type
                  , Pred
                >::type
            type;
        };
    }

    template <typename Pred, typename Sequence>
    inline typename 
        lazy_disable_if<
            is_const<Sequence>
          , result_of::find_if<Sequence, Pred>
        >::type
    find_if(Sequence& seq)
    {
        typedef
            detail::static_find_if<
                typename result_of::begin<Sequence>::type
              , typename result_of::end<Sequence>::type
              , Pred
            >
        filter;

        return filter::call(fusion::begin(seq));
    }

    template <typename Pred, typename Sequence>
    inline typename result_of::find_if<Sequence const, Pred>::type const
    find_if(Sequence const& seq)
    {
        typedef
            detail::static_find_if<
                typename result_of::begin<Sequence const>::type
              , typename result_of::end<Sequence const>::type
              , Pred
            >
        filter;

        return filter::call(fusion::begin(seq));
    }
}}

#endif