3 // Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. Use, modification and
4 // distribution is subject to the Boost Software License, Version
5 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
8 // For more information, see http://www.boost.org/libs/range/
11 #ifndef BOOST_RANGE_ADAPTOR_MAP_HPP
12 #define BOOST_RANGE_ADAPTOR_MAP_HPP
14 #include <boost/range/adaptor/transformed.hpp>
15 #include <boost/range/iterator_range.hpp>
16 #include <boost/range/value_type.hpp>
17 #include <boost/range/reference.hpp>
18 #include <boost/range/concepts.hpp>
22 namespace range_detail
24 struct map_keys_forwarder {};
25 struct map_values_forwarder {};
30 typedef BOOST_DEDUCED_TYPENAME range_reference<const Map>::type argument_type;
31 typedef const BOOST_DEDUCED_TYPENAME range_value<const Map>::type::first_type& result_type;
33 result_type operator()( argument_type r ) const
40 struct select_second_mutable
42 typedef BOOST_DEDUCED_TYPENAME range_reference<Map>::type argument_type;
43 typedef BOOST_DEDUCED_TYPENAME range_value<Map>::type::second_type& result_type;
45 result_type operator()( argument_type r ) const
52 struct select_second_const
54 typedef BOOST_DEDUCED_TYPENAME range_reference<const Map>::type argument_type;
55 typedef const BOOST_DEDUCED_TYPENAME range_value<const Map>::type::second_type& result_type;
57 result_type operator()( argument_type r ) const
63 template<class StdPairRng>
64 class select_first_range
65 : public transformed_range<
66 select_first<StdPairRng>,
69 typedef transformed_range<select_first<StdPairRng>, const StdPairRng> base;
71 typedef select_first<StdPairRng> transform_fn_type;
72 typedef const StdPairRng source_range_type;
74 select_first_range(transform_fn_type fn, source_range_type& rng)
79 select_first_range(const base& other) : base(other) {}
82 template<class StdPairRng>
83 class select_second_mutable_range
84 : public transformed_range<
85 select_second_mutable<StdPairRng>,
88 typedef transformed_range<select_second_mutable<StdPairRng>, StdPairRng> base;
90 typedef select_second_mutable<StdPairRng> transform_fn_type;
91 typedef StdPairRng source_range_type;
93 select_second_mutable_range(transform_fn_type fn, source_range_type& rng)
98 select_second_mutable_range(const base& other) : base(other) {}
101 template<class StdPairRng>
102 class select_second_const_range
103 : public transformed_range<
104 select_second_const<StdPairRng>,
107 typedef transformed_range<select_second_const<StdPairRng>, const StdPairRng> base;
109 typedef select_second_const<StdPairRng> transform_fn_type;
110 typedef const StdPairRng source_range_type;
112 select_second_const_range(transform_fn_type fn, source_range_type& rng)
117 select_second_const_range(const base& other) : base(other) {}
120 template< class StdPairRng >
121 inline select_first_range<StdPairRng>
122 operator|( const StdPairRng& r, map_keys_forwarder )
124 BOOST_RANGE_CONCEPT_ASSERT((
125 SinglePassRangeConcept<const StdPairRng>));
128 boost::adaptors::transformed( select_first<StdPairRng>() ) );
131 template< class StdPairRng >
132 inline select_second_mutable_range<StdPairRng>
133 operator|( StdPairRng& r, map_values_forwarder )
135 BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<StdPairRng>));
138 boost::adaptors::transformed( select_second_mutable<StdPairRng>() ) );
141 template< class StdPairRng >
142 inline select_second_const_range<StdPairRng>
143 operator|( const StdPairRng& r, map_values_forwarder )
145 BOOST_RANGE_CONCEPT_ASSERT((
146 SinglePassRangeConcept<const StdPairRng>));
149 boost::adaptors::transformed( select_second_const<StdPairRng>() ) );
154 using range_detail::select_first_range;
155 using range_detail::select_second_mutable_range;
156 using range_detail::select_second_const_range;
162 const range_detail::map_keys_forwarder map_keys =
163 range_detail::map_keys_forwarder();
165 const range_detail::map_values_forwarder map_values =
166 range_detail::map_values_forwarder();
169 template<class StdPairRange>
170 inline select_first_range<StdPairRange>
171 keys(const StdPairRange& rng)
173 BOOST_RANGE_CONCEPT_ASSERT((
174 SinglePassRangeConcept<const StdPairRange>));
176 return select_first_range<StdPairRange>(
177 range_detail::select_first<StdPairRange>(), rng );
180 template<class StdPairRange>
181 inline select_second_const_range<StdPairRange>
182 values(const StdPairRange& rng)
184 BOOST_RANGE_CONCEPT_ASSERT((
185 SinglePassRangeConcept<const StdPairRange>));
187 return select_second_const_range<StdPairRange>(
188 range_detail::select_second_const<StdPairRange>(), rng );
191 template<class StdPairRange>
192 inline select_second_mutable_range<StdPairRange>
193 values(StdPairRange& rng)
195 BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<StdPairRange>));
197 return select_second_mutable_range<StdPairRange>(
198 range_detail::select_second_mutable<StdPairRange>(), rng );