ceph/src/boost/libs/icl/include/boost/icl/concept/map_value.hpp

   1 /*-----------------------------------------------------------------------------+
   2 Copyright (c) 2010-2010: 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_CONCEPT_MAP_VALUE_HPP_JOFA_100924
   9 #define BOOST_ICL_CONCEPT_MAP_VALUE_HPP_JOFA_100924
  10
  11 #include <boost/icl/type_traits/predicate.hpp>
  12 #include <boost/icl/type_traits/identity_element.hpp>
  13 #include <boost/icl/type_traits/is_map.hpp>
  14
  15 namespace boost{ namespace icl
  16 {
  17
  18 //==============================================================================
  19 //= AlgoUnifiers<Map>
  20 //==============================================================================
  21 template<class Type, class Iterator>
  22 inline typename enable_if<is_map<Type>, const typename Type::key_type>::type&
  23 key_value(Iterator it_)
  24 {
  25     return (*it_).first;
  26 }
  27
  28 template<class Type, class Iterator>
  29 inline typename enable_if<is_map<Type>, const typename Type::codomain_type>::type&
  30 co_value(Iterator it_)
  31 {
  32     return (*it_).second;
  33 }
  34
  35 template<class Type>
  36 inline typename enable_if<is_map<Type>, typename Type::value_type>::type
  37 make_value(const typename Type::     key_type& key_val,
  38            const typename Type::codomain_type&  co_val)
  39 {
  40     return typename Type::value_type(key_val, co_val);
  41 }
  42
  43
  44 template <class Type>
  45 class content_is_identity_element: public property<Type>
  46 {
  47 public:
  48     bool operator() (const Type& value_pair)const
  49     {
  50         return value_pair.second
  51             == identity_element<typename Type::second_type>::value();
  52     }
  53 } ;
  54
  55
  56
  57 }} // namespace boost icl
  58
  59 #endif
  60
  61