ceph/src/boost/libs/fusion/include/boost/fusion/view/filter_view/detail/begin_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(FUSION_BEGIN_IMPL_05062005_0903)
   8 #define FUSION_BEGIN_IMPL_05062005_0903
   9
  10 namespace boost { namespace fusion
  11 {
  12     struct filter_view_tag;
  13
  14     template <typename Category, typename First, typename Last, typename Pred>
  15     struct filter_iterator;
  16
  17     namespace extension
  18     {
  19         template <typename Tag>
  20         struct begin_impl;
  21
  22         template <>
  23         struct begin_impl<filter_view_tag>
  24         {
  25             template <typename Sequence>
  26             struct apply
  27             {
  28                 typedef typename Sequence::first_type first_type;
  29                 typedef typename Sequence::last_type last_type;
  30                 typedef typename Sequence::pred_type pred_type;
  31                 typedef typename Sequence::category category;
  32                 typedef filter_iterator<category, first_type, last_type, pred_type> type;
  33
  34                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  35                 static type
  36                 call(Sequence& s)
  37                 {
  38                     return type(s.first());
  39                 }
  40             };
  41         };
  42     }
  43 }}
  44
  45 #endif
  46
  47