1// Boost.Range library
2//
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)
7//
8// For more information, see http://www.boost.org/libs/range/
9//
10
11#ifndef BOOST_RANGE_ADAPTOR_UNIQUED_IMPL_HPP
12#define BOOST_RANGE_ADAPTOR_UNIQUED_IMPL_HPP
13
14#include <boost/range/adaptor/adjacent_filtered.hpp>
15#include <boost/range/concepts.hpp>
16
17namespace boost
18{
19
20 namespace range_detail
21 {
22 struct unique_forwarder { };
23
24 struct unique_not_equal_to
25 {
26 typedef bool result_type;
27
28 template< class T >
29 bool operator()( const T& l, const T& r ) const
30 {
31 return !(l == r);
32 }
33 };
34
35 template<class ForwardRng>
36 class uniqued_range : public adjacent_filtered_range<unique_not_equal_to, ForwardRng, true>
37 {
38 typedef adjacent_filtered_range<unique_not_equal_to, ForwardRng, true> base;
39 public:
40 explicit uniqued_range(ForwardRng& rng)
41 : base(unique_not_equal_to(), rng)
42 {
43 }
44 };
45
46 template< class ForwardRng >
47 inline uniqued_range<ForwardRng>
48 operator|( ForwardRng& r,
49 unique_forwarder )
50 {
51 BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRng>));
52 return uniqued_range<ForwardRng>(r);
53 }
54
55 template< class ForwardRng >
56 inline uniqued_range<const ForwardRng>
57 operator|( const ForwardRng& r,
58 unique_forwarder )
59 {
60 BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<const ForwardRng>));
61 return uniqued_range<const ForwardRng>(r);
62 }
63
64 } // 'range_detail'
65
66 using range_detail::uniqued_range;
67
68 namespace adaptors
69 {
70 namespace
71 {
72 const range_detail::unique_forwarder uniqued =
73 range_detail::unique_forwarder();
74 }
75
76 template<class ForwardRange>
77 inline uniqued_range<ForwardRange>
78 unique(ForwardRange& rng)
79 {
80 BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
81 return uniqued_range<ForwardRange>(rng);
82 }
83
84 template<class ForwardRange>
85 inline uniqued_range<const ForwardRange>
86 unique(const ForwardRange& rng)
87 {
88 BOOST_RANGE_CONCEPT_ASSERT((
89 ForwardRangeConcept<const ForwardRange>));
90
91 return uniqued_range<const ForwardRange>(rng);
92 }
93 } // 'adaptors'
94
95}
96
97#endif
98