ceph/src/boost/boost/icl/type_traits/rep_type_of.hpp

   1 /*-----------------------------------------------------------------------------+
   2 Copyright (c) 2008-2009: Joachim Faulhaber
   3 +------------------------------------------------------------------------------+
   4    Distributed under the Boost Software License, Version 1.0.
   5       (See accompanying file LICENCE.txt or copy at
   6            http://www.boost.org/LICENSE_1_0.txt)
   7 +-----------------------------------------------------------------------------*/
   8 #ifndef BOOST_ICL_TYPE_TRAITS_REP_TYPE_OF_HPP_JOFA_110329
   9 #define BOOST_ICL_TYPE_TRAITS_REP_TYPE_OF_HPP_JOFA_110329
  10
  11 #include <boost/config.hpp> // For macro BOOST_STATIC_CONSTANT
  12 #include <boost/mpl/has_xxx.hpp>
  13 #include <boost/mpl/or.hpp>
  14 #include <boost/mpl/and.hpp>
  15 #include <boost/mpl/not.hpp>
  16 #include <boost/type_traits/is_same.hpp>
  17 #include <boost/icl/type_traits/no_type.hpp>
  18
  19 namespace boost{ namespace icl
  20 {
  21     namespace detail
  22     {
  23         BOOST_MPL_HAS_XXX_TRAIT_DEF(rep)
  24     }
  25
  26     //--------------------------------------------------------------------------
  27     template <class Type>
  28     struct has_rep_type
  29       : mpl::bool_<detail::has_rep<Type>::value>
  30     {};
  31
  32     template <class Rep, class Type>
  33     struct represents // Rep represents Type;  Type is_wrapper_of Rep
  34       : mpl::bool_<detail::has_rep<Type>::value>
  35     {
  36         typedef represents type;
  37         BOOST_STATIC_CONSTANT(bool,
  38             value = (mpl::and_< has_rep_type<Type>
  39                               , boost::is_same<typename Type::rep, Rep> >::value)
  40             );
  41     };
  42
  43     //--------------------------------------------------------------------------
  44     template <class Type, bool has_rep>
  45     struct get_rep_type;
  46
  47     template <class Type>
  48     struct get_rep_type<Type, false>
  49     {
  50         typedef no_type type;
  51     };
  52
  53     template <class Type>
  54     struct get_rep_type<Type, true>
  55     {
  56         typedef typename Type::rep type;
  57     };
  58
  59     //--------------------------------------------------------------------------
  60     template<class Type>
  61     struct rep_type_of
  62     {
  63         typedef typename
  64             get_rep_type<Type, has_rep_type<Type>::value>::type type;
  65     };
  66
  67 }} // namespace boost icl
  68
  69 #endif