ceph/src/boost/libs/phoenix/include/boost/phoenix/object/reinterpret_cast.hpp

   1 /*==============================================================================
   2     Copyright (c) 2001-2010 Joel de Guzman
   3     Copyright (c) 2010 Thomas Heller
   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 #ifndef BOOST_PHOENIX_OBJECT_REINTERPRET_CAST_HPP
   9 #define BOOST_PHOENIX_OBJECT_REINTERPRET_CAST_HPP
  10
  11 #include <boost/phoenix/core/limits.hpp>
  12 #include <boost/phoenix/core/call.hpp>
  13 #include <boost/phoenix/core/expression.hpp>
  14 #include <boost/phoenix/core/meta_grammar.hpp>
  15 #include <boost/phoenix/object/detail/target.hpp>
  16 #include <boost/proto/transform/lazy.hpp>
  17
  18 BOOST_PHOENIX_DEFINE_EXPRESSION(
  19     (boost)(phoenix)(reinterpret_cast_)
  20   , (proto::terminal<detail::target<proto::_> >)
  21     (meta_grammar)
  22 )
  23
  24 namespace boost { namespace phoenix
  25 {
  26     struct reinterpret_cast_eval
  27     {
  28         template <typename Sig>
  29         struct result;
  30
  31         template <typename This, typename Target, typename Source, typename Context>
  32         struct result<This(Target, Source, Context)>
  33             : detail::result_of::target<Target>
  34         {};
  35
  36         template <typename Target, typename Source, typename Context>
  37         typename detail::result_of::target<Target>::type
  38         operator()(Target, Source const& u, Context const& ctx) const
  39         {
  40             return
  41                 reinterpret_cast<
  42                     typename detail::result_of::target<Target>::type
  43                 >(boost::phoenix::eval(u, ctx));
  44         }
  45     };
  46
  47     template <typename Dummy>
  48     struct default_actions::when<rule::reinterpret_cast_, Dummy>
  49         : call<reinterpret_cast_eval, Dummy>
  50     {};
  51
  52     template <typename T, typename U>
  53     inline
  54     typename expression::reinterpret_cast_<detail::target<T>, U>::type const
  55     reinterpret_cast_(U const& u)
  56     {
  57         return
  58             expression::
  59                 reinterpret_cast_<detail::target<T>, U>::
  60                     make(detail::target<T>(), u);
  61     }
  62 }}
  63
  64 #endif