boost/phoenix/bind/detail/member_variable.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2007 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 #ifndef BOOST_PHOENIX_CORE_DETAIL_MEMBER_VARIABLE_HPP
   8 #define BOOST_PHOENIX_CORE_DETAIL_MEMBER_VARIABLE_HPP
   9
  10 #include <boost/proto/detail/decltype.hpp>
  11 #include <boost/type_traits/remove_pointer.hpp>
  12
  13 #ifdef _MSC_VER
  14 #pragma warning(push)
  15 #pragma warning(disable: 4180) // qualifier applied to function type has no meaning; ignored
  16 #endif
  17
  18 namespace boost { namespace phoenix { namespace detail {
  19
  20         template <typename RT, typename MP>
  21         struct member_variable
  22         {
  23             template <typename Sig>
  24             struct result;
  25
  26             template <typename This, typename Class>
  27             struct result<This(Class)>
  28                 : result<This(Class const &)>
  29             {};
  30
  31             template <typename This, typename Class>
  32             struct result<This(Class &)>
  33             {
  34                 typedef typename boost::mpl::if_c<
  35                     boost::is_const<
  36                         typename boost::remove_pointer<
  37                             typename boost::remove_reference<Class>::type
  38                         >::type
  39                     >::value
  40                   , const RT&
  41                   , RT&
  42                 >::type
  43                 type;
  44             };
  45
  46             member_variable(MP mp_)
  47                 : mp(mp_) {}
  48
  49             template <typename Class>
  50             RT& operator()(Class& obj) const
  51             {
  52                 BOOST_PROTO_USE_GET_POINTER();
  53
  54                 typedef typename proto::detail::class_member_traits<MP>::class_type class_type;
  55                 return (BOOST_PROTO_GET_POINTER(class_type, obj)->*mp);
  56             }
  57
  58             template <typename Class>
  59             RT& operator()(Class* obj) const
  60             {
  61                 return obj->*mp;
  62             }
  63
  64             template <typename Class>
  65             RT const& operator()(Class const& obj) const
  66             {
  67                 BOOST_PROTO_USE_GET_POINTER();
  68
  69                 typedef typename proto::detail::class_member_traits<MP>::class_type class_type;
  70                 return (BOOST_PROTO_GET_POINTER(class_type, obj)->*mp);
  71             }
  72
  73             template <typename Class>
  74             RT const& operator()(Class const* obj) const
  75             {
  76                 return obj->*mp;
  77             }
  78
  79             MP mp;
  80         };
  81 }}}
  82
  83 #ifdef _MSC_VER
  84 #pragma warning(pop)
  85 #endif
  86
  87 #endif