ceph/src/boost/libs/fusion/include/boost/fusion/algorithm/transformation/filter.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2005-2006 Dan Marsden
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(FUSION_FILTER_02122005_1839)
   9 #define FUSION_FILTER_02122005_1839
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/view/filter_view/filter_view.hpp>
  13 #include <boost/type_traits/is_same.hpp>
  14
  15 namespace boost { namespace fusion
  16 {
  17     namespace result_of
  18     {
  19         template <typename Sequence, typename T>
  20         struct filter
  21         {
  22             typedef filter_view<Sequence, is_same<mpl::_, T> > type;
  23         };
  24     }
  25
  26     template <typename T, typename Sequence>
  27     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  28     inline typename result_of::filter<Sequence const, T>::type
  29     filter(Sequence const& seq)
  30     {
  31         return filter_view<const Sequence, is_same<mpl::_, T> >(seq);
  32     }
  33 }}
  34
  35 #endif
  36