ceph/src/boost/libs/icl/include/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/icl/type_traits/no_type.hpp>
  17
  18 namespace boost{ namespace icl
  19 {
  20     namespace detail
  21     {
  22         BOOST_MPL_HAS_XXX_TRAIT_DEF(rep)
  23     }
  24
  25     //--------------------------------------------------------------------------
  26     template <class Type>
  27     struct has_rep_type
  28       : mpl::bool_<detail::has_rep<Type>::value>
  29     {};
  30
  31     template <class Rep, class Type>
  32     struct represents // Rep represents Type;  Type is_wrapper_of Rep
  33       : mpl::bool_<detail::has_rep<Type>::value>
  34     {
  35         typedef represents type;
  36         BOOST_STATIC_CONSTANT(bool,
  37             value = (mpl::and_< has_rep_type<Type>
  38                               , is_same<typename Type::rep, Rep> >::value)
  39             );
  40     };
  41
  42     //--------------------------------------------------------------------------
  43     template <class Type, bool has_rep>
  44     struct get_rep_type;
  45
  46     template <class Type>
  47     struct get_rep_type<Type, false>
  48     {
  49         typedef no_type type;
  50     };
  51
  52     template <class Type>
  53     struct get_rep_type<Type, true>
  54     {
  55         typedef typename Type::rep type;
  56     };
  57
  58     //--------------------------------------------------------------------------
  59     template<class Type>
  60     struct rep_type_of
  61     {
  62         typedef typename
  63             get_rep_type<Type, has_rep_type<Type>::value>::type type;
  64     };
  65
  66 }} // namespace boost icl
  67
  68 #endif
  69
  70