ceph/src/boost/boost/icl/type_traits/codomain_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_CODOMAIN_TYPE_OF_HPP_JOFA_100829
   9 #define BOOST_ICL_TYPE_TRAITS_CODOMAIN_TYPE_OF_HPP_JOFA_100829
  10
  11 #include <set>
  12 #include <boost/mpl/has_xxx.hpp>
  13 #include <boost/mpl/bool.hpp>
  14 #include <boost/icl/type_traits/no_type.hpp>
  15 #include <boost/icl/type_traits/is_container.hpp>
  16
  17 namespace boost{ namespace icl
  18 {
  19     namespace detail
  20     {
  21         BOOST_MPL_HAS_XXX_TRAIT_DEF(codomain_type)
  22     }
  23
  24     template <class Type>
  25     struct has_codomain_type
  26       : mpl::bool_<detail::has_codomain_type<Type>::value>
  27     {};
  28
  29     template <class Type, bool has_codomain_type, bool is_std_set>
  30     struct get_codomain_type;
  31
  32     template <class Type>
  33     struct get_codomain_type<Type, false, false>
  34     {
  35         typedef no_type type;
  36     };
  37
  38     template <class Type, bool is_std_set>
  39     struct get_codomain_type<Type, true, is_std_set>
  40     {
  41         typedef typename Type::codomain_type type;
  42     };
  43
  44     template <class Type>
  45     struct get_codomain_type<Type, false, true>
  46     {
  47         typedef typename Type::value_type type;
  48     };
  49
  50     template <class Type>
  51     struct codomain_type_of
  52     {
  53         typedef typename
  54             get_codomain_type< Type
  55                              , has_codomain_type<Type>::value
  56                              , is_std_set<Type>::value
  57                              >::type type;
  58     };
  59
  60 }} // namespace boost icl
  61
  62 #endif
  63
  64