projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
| 2 | ||
| 3 | // Copyright (c) 2014, Oracle and/or its affiliates. | |
| 4 | ||
| 5 | // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle | |
| 6 | ||
| 7 | // Licensed under the Boost Software License version 1.0. | |
| 8 | // http://www.boost.org/users/license.html | |
| 9 | ||
| 10 | #ifndef BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP | |
| 11 | #define BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP | |
| 12 | ||
| 13 | #include <boost/mpl/assert.hpp> | |
| 14 | #include <boost/type_traits/is_convertible.hpp> | |
| 7c673cae FG |
15 | #include <boost/iterator/iterator_facade.hpp> |
| 16 | #include <boost/iterator/iterator_categories.hpp> | |
| 17 | ||
| 18 | ||
| 19 | namespace boost { namespace geometry | |
| 20 | { | |
| 21 | ||
| 22 | ||
| 23 | ||
| 24 | template | |
| 25 | < | |
| 26 | typename Iterator1, | |
| 27 | typename Iterator2, | |
| 28 | typename Value, | |
| 29 | typename Reference = Value& | |
| 30 | > | |
| 31 | class concatenate_iterator | |
| 32 | : public boost::iterator_facade | |
| 33 | < | |
| 34 | concatenate_iterator<Iterator1, Iterator2, Value, Reference>, | |
| 35 | Value, | |
| 36 | boost::bidirectional_traversal_tag, | |
| 37 | Reference | |
| 38 | > | |
| 39 | { | |
| 40 | private: | |
| 41 | Iterator1 m_it1, m_end1; | |
| 42 | Iterator2 m_begin2, m_it2; | |
| 43 | ||
| 44 | public: | |
| 45 | typedef Iterator1 first_iterator_type; | |
| 46 | typedef Iterator2 second_iterator_type; | |
| 47 | ||
| 48 | // default constructor | |
| 49 | concatenate_iterator() {} | |
| 50 | ||
| 51 | // for begin | |
| 52 | concatenate_iterator(Iterator1 it1, Iterator1 end1, | |
| 53 | Iterator2 begin2, Iterator2 it2) | |
| 54 | : m_it1(it1), m_end1(end1), m_begin2(begin2), m_it2(it2) | |
| 55 | {} | |
| 56 | ||
| 57 | // for end | |
| 58 | concatenate_iterator(Iterator1 end1, Iterator2 begin2, Iterator2 end2) | |
| 59 | : m_it1(end1), m_end1(end1), m_begin2(begin2), m_it2(end2) | |
| 60 | {} | |
| 61 | ||
| 62 | template | |
| 63 | < | |
| 64 | typename OtherIt1, | |
| 65 | typename OtherIt2, | |
| 66 | typename OtherValue, | |
| 67 | typename OtherReference | |
| 68 | > | |
| 69 | concatenate_iterator(concatenate_iterator | |
| 70 | < | |
| 71 | OtherIt1, | |
| 72 | OtherIt2, | |
| 73 | OtherValue, | |
| 74 | OtherReference | |
| 75 | > const& other) | |
| 76 | : m_it1(other.m_it1) | |
| 77 | , m_end1(other.m_end1) | |
| 78 | , m_begin2(other.m_begin2) | |
| 79 | , m_it2(other.m_it2) | |
| 80 | { | |
| 81 | static const bool are_conv | |
| 82 | = boost::is_convertible<OtherIt1, Iterator1>::value | |
| 83 | && boost::is_convertible<OtherIt2, Iterator2>::value; | |
| 84 | ||
| 85 | BOOST_MPL_ASSERT_MSG((are_conv), | |
| 86 | NOT_CONVERTIBLE, | |
| 87 | (types<OtherIt1, OtherIt2>)); | |
| 88 | } | |
| 89 | ||
| 90 | private: | |
| 91 | friend class boost::iterator_core_access; | |
| 92 | ||
| 93 | template <typename It1, typename It2, typename V, typename R> | |
| 94 | friend class concatenate_iterator; | |
| 95 | ||
| 96 | inline Reference dereference() const | |
| 97 | { | |
| 98 | if ( m_it1 == m_end1 ) | |
| 99 | { | |
| 100 | return *m_it2; | |
| 101 | } | |
| 102 | return *m_it1; | |
| 103 | } | |
| 104 | ||
| 105 | template | |
| 106 | < | |
| 107 | typename OtherIt1, | |
| 108 | typename OtherIt2, | |
| 109 | typename OtherValue, | |
| 110 | typename OtherReference | |
| 111 | > | |
| 112 | inline bool equal(concatenate_iterator | |
| 113 | < | |
| 114 | OtherIt1, | |
| 115 | OtherIt2, | |
| 116 | OtherValue, | |
| 117 | OtherReference | |
| 118 | > const& other) const | |
| 119 | { | |
| 120 | return m_it1 == other.m_it1 && m_it2 == other.m_it2; | |
| 121 | } | |
| 122 | ||
| 123 | inline void increment() | |
| 124 | { | |
| 125 | if ( m_it1 == m_end1 ) | |
| 126 | { | |
| 127 | ++m_it2; | |
| 128 | } | |
| 129 | else | |
| 130 | { | |
| 131 | ++m_it1; | |
| 132 | } | |
| 133 | } | |
| 134 | ||
| 135 | inline void decrement() | |
| 136 | { | |
| 137 | if ( m_it2 == m_begin2 ) | |
| 138 | { | |
| 139 | --m_it1; | |
| 140 | } | |
| 141 | else | |
| 142 | { | |
| 143 | --m_it2; | |
| 144 | } | |
| 145 | } | |
| 146 | }; | |
| 147 | ||
| 148 | ||
| 149 | ||
| 150 | }} // namespace boost::geometry | |
| 151 | ||
| 152 | #endif // BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP |