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3rdparty/boost_1_81_0/boost/fusion/sequence/convert.hpp 1.84 KB
63e88f80   Hu Chunming   提交三方库
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  /*=============================================================================
      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_CONVERT_10022005_1442)
  #define FUSION_CONVERT_10022005_1442
  
  #include <boost/fusion/support/config.hpp>
  #if BOOST_WORKAROUND(BOOST_GCC, < 30500)
  #include <boost/core/enable_if.hpp>
  #include <boost/type_traits/is_const.hpp>
  #define BOOST_FUSION_WA_GCC34(type1, type2) \
      boost::lazy_disable_if<boost::is_const<Sequence>, type1, type2>
  #else
  #define BOOST_FUSION_WA_GCC34(type1, type2) type1, type2
  #endif
  
  namespace boost { namespace fusion
  {
      namespace extension
      {
          template <typename Tag>
          struct convert_impl;
      }
  
      namespace result_of
      {
          template <typename Tag, typename Sequence>
          struct convert
          {
              typedef typename
                  extension::convert_impl<Tag>::template apply<Sequence>
              gen;
  
              typedef typename gen::type type;
          };
      }
  
      template <typename Tag, typename Sequence>
      BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
      inline typename BOOST_FUSION_WA_GCC34(result_of::convert<Tag, Sequence>)::type
      convert(Sequence& seq)
      {
          typedef typename result_of::convert<Tag, Sequence>::gen gen;
          return gen::call(seq);
      }
  
      template <typename Tag, typename Sequence>
      BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
      inline typename result_of::convert<Tag, Sequence const>::type
      convert(Sequence const& seq)
      {
          typedef typename result_of::convert<Tag, Sequence const>::gen gen;
          return gen::call(seq);
      }
  }}
  
  #undef BOOST_FUSION_WA_GCC34
  #endif