ceph/src/boost/boost/fusion/sequence/convert.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_CONVERT_10022005_1442)
   8 #define FUSION_CONVERT_10022005_1442
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #if BOOST_WORKAROUND(BOOST_GCC, < 30500)
  12 #include <boost/core/enable_if.hpp>
  13 #include <boost/type_traits/is_const.hpp>
  14 #define BOOST_FUSION_WA_GCC34(type1, type2) \
  15     boost::lazy_disable_if<boost::is_const<Sequence>, type1, type2>
  16 #else
  17 #define BOOST_FUSION_WA_GCC34(type1, type2) type1, type2
  18 #endif
  19
  20 namespace boost { namespace fusion
  21 {
  22     namespace extension
  23     {
  24         template <typename Tag>
  25         struct convert_impl;
  26     }
  27
  28     namespace result_of
  29     {
  30         template <typename Tag, typename Sequence>
  31         struct convert
  32         {
  33             typedef typename
  34                 extension::convert_impl<Tag>::template apply<Sequence>
  35             gen;
  36
  37             typedef typename gen::type type;
  38         };
  39     }
  40
  41     template <typename Tag, typename Sequence>
  42     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  43     inline typename BOOST_FUSION_WA_GCC34(result_of::convert<Tag, Sequence>)::type
  44     convert(Sequence& seq)
  45     {
  46         typedef typename result_of::convert<Tag, Sequence>::gen gen;
  47         return gen::call(seq);
  48     }
  49
  50     template <typename Tag, typename Sequence>
  51     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  52     inline typename result_of::convert<Tag, Sequence const>::type
  53     convert(Sequence const& seq)
  54     {
  55         typedef typename result_of::convert<Tag, Sequence const>::gen gen;
  56         return gen::call(seq);
  57     }
  58 }}
  59
  60 #undef BOOST_FUSION_WA_GCC34
  61 #endif