ceph/src/boost/boost/icl/type_traits/size_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_SIZE_TYPE_OF_HPP_JOFA_080911
   9 #define BOOST_ICL_TYPE_TRAITS_SIZE_TYPE_OF_HPP_JOFA_080911
  10
  11 #include <boost/mpl/has_xxx.hpp>
  12 #include <boost/icl/type_traits/difference_type_of.hpp>
  13
  14 namespace boost{ namespace icl
  15 {
  16
  17     namespace detail
  18     {
  19         BOOST_MPL_HAS_XXX_TRAIT_DEF(size_type)
  20     }
  21
  22     //--------------------------------------------------------------------------
  23     template <class Type>
  24     struct has_size_type
  25       : mpl::bool_<detail::has_size_type<Type>::value>
  26     {};
  27
  28     //--------------------------------------------------------------------------
  29     template <class Type, bool has_size, bool has_diff, bool has_rep>
  30     struct get_size_type;
  31
  32     template <class Type>
  33     struct get_size_type<Type, false, false, false>
  34     {
  35         typedef std::size_t type;
  36     };
  37
  38     template <class Type, bool has_diff, bool has_rep>
  39     struct get_size_type<Type, true, has_diff, has_rep>
  40     {
  41         typedef typename Type::size_type type;
  42     };
  43
  44     template <class Type, bool has_rep>
  45     struct get_size_type<Type, false, true, has_rep>
  46     {
  47         typedef typename Type::difference_type type;
  48     };
  49
  50     template <class Type>
  51     struct get_size_type<Type, false, false, true>
  52     {
  53         typedef Type type;
  54     };
  55
  56     //--------------------------------------------------------------------------
  57     template<class Type>
  58     struct size_type_of
  59     {
  60         typedef typename
  61             get_size_type< Type
  62                          , has_size_type<Type>::value
  63                          , has_difference_type<Type>::value
  64                          , has_rep_type<Type>::value
  65                          >::type type;
  66     };
  67
  68 }} // namespace boost icl
  69
  70 #endif
  71
  72