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_SLICED_HPP
12#define BOOST_RANGE_ADAPTOR_SLICED_HPP
13
14#include <boost/range/adaptor/argument_fwd.hpp>
15#include <boost/range/size_type.hpp>
16#include <boost/range/iterator_range.hpp>
17#include <boost/range/concepts.hpp>
18
19namespace boost
20{
21 namespace adaptors
22 {
23 struct sliced
24 {
25 sliced(std::size_t t_, std::size_t u_)
26 : t(t_), u(u_) {}
27 std::size_t t;
28 std::size_t u;
29 };
30
31 template< class RandomAccessRange >
32 class sliced_range : public boost::iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type >
33 {
34 typedef boost::iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type > base_t;
35 public:
36 template<typename Rng, typename T, typename U>
37 sliced_range(Rng& rng, T t, U u)
38 : base_t(boost::next(boost::begin(rng), t),
39 boost::next(boost::begin(rng), u))
40 {
41 }
42 };
43
44 template< class RandomAccessRange >
45 inline sliced_range<RandomAccessRange>
46 slice( RandomAccessRange& rng, std::size_t t, std::size_t u )
47 {
48 BOOST_RANGE_CONCEPT_ASSERT((
49 RandomAccessRangeConcept<RandomAccessRange>));
50
51 BOOST_ASSERT( t <= u && "error in slice indices" );
52 BOOST_ASSERT( static_cast<std::size_t>(boost::size(rng)) >= u &&
53 "second slice index out of bounds" );
54
55 return sliced_range<RandomAccessRange>(rng, t, u);
56 }
57
58 template< class RandomAccessRange >
59 inline iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type >
60 slice( const RandomAccessRange& rng, std::size_t t, std::size_t u )
61 {
62 BOOST_RANGE_CONCEPT_ASSERT((
63 RandomAccessRangeConcept<const RandomAccessRange>));
64
65 BOOST_ASSERT( t <= u && "error in slice indices" );
66 BOOST_ASSERT( static_cast<std::size_t>(boost::size(rng)) >= u &&
67 "second slice index out of bounds" );
68
69 return sliced_range<const RandomAccessRange>(rng, t, u);
70 }
71
72 template< class RandomAccessRange >
73 inline sliced_range<RandomAccessRange>
74 operator|( RandomAccessRange& r, const sliced& f )
75 {
76 BOOST_RANGE_CONCEPT_ASSERT((
77 RandomAccessRangeConcept<RandomAccessRange>));
78
79 return sliced_range<RandomAccessRange>( r, f.t, f.u );
80 }
81
82 template< class RandomAccessRange >
83 inline sliced_range<const RandomAccessRange>
84 operator|( const RandomAccessRange& r, const sliced& f )
85 {
86 BOOST_RANGE_CONCEPT_ASSERT((
87 RandomAccessRangeConcept<const RandomAccessRange>));
88
89 return sliced_range<const RandomAccessRange>( r, f.t, f.u );
90 }
91
92 } // namespace adaptors
93 using adaptors::sliced_range;
94} // namespace boost
95
96#endif
97

source code of boost/boost/range/adaptor/sliced.hpp