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&
key_value(Iterator it_)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&
co_value(Iterator it_)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
make_value(const typename Type::key_type & key_val,const typename Type::codomain_type & co_val)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:
operator ()(const Type & value_pair) const48     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 
62