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> | |
| 15 | #include <boost/iterator.hpp> | |
| 16 | #include <boost/iterator/iterator_facade.hpp> | |
| 17 | #include <boost/iterator/iterator_categories.hpp> | |
| 18 | ||
| 19 | ||
| 20 | namespace boost { namespace geometry | |
| 21 | { | |
| 22 | ||
| 23 | ||
| 24 | ||
| 25 | template | |
| 26 | < | |
| 27 | typename Iterator1, | |
| 28 | typename Iterator2, | |
| 29 | typename Value, | |
| 30 | typename Reference = Value& | |
| 31 | > | |
| 32 | class concatenate_iterator | |
| 33 | : public boost::iterator_facade | |
| 34 | < | |
| 35 | concatenate_iterator<Iterator1, Iterator2, Value, Reference>, | |
| 36 | Value, | |
| 37 | boost::bidirectional_traversal_tag, | |
| 38 | Reference | |
| 39 | > | |
| 40 | { | |
| 41 | private: | |
| 42 | Iterator1 m_it1, m_end1; | |
| 43 | Iterator2 m_begin2, m_it2; | |
| 44 | ||
| 45 | public: | |
| 46 | typedef Iterator1 first_iterator_type; | |
| 47 | typedef Iterator2 second_iterator_type; | |
| 48 | ||
| 49 | // default constructor | |
| 50 | concatenate_iterator() {} | |
| 51 | ||
| 52 | // for begin | |
| 53 | concatenate_iterator(Iterator1 it1, Iterator1 end1, | |
| 54 | Iterator2 begin2, Iterator2 it2) | |
| 55 | : m_it1(it1), m_end1(end1), m_begin2(begin2), m_it2(it2) | |
| 56 | {} | |
| 57 | ||
| 58 | // for end | |
| 59 | concatenate_iterator(Iterator1 end1, Iterator2 begin2, Iterator2 end2) | |
| 60 | : m_it1(end1), m_end1(end1), m_begin2(begin2), m_it2(end2) | |
| 61 | {} | |
| 62 | ||
| 63 | template | |
| 64 | < | |
| 65 | typename OtherIt1, | |
| 66 | typename OtherIt2, | |
| 67 | typename OtherValue, | |
| 68 | typename OtherReference | |
| 69 | > | |
| 70 | concatenate_iterator(concatenate_iterator | |
| 71 | < | |
| 72 | OtherIt1, | |
| 73 | OtherIt2, | |
| 74 | OtherValue, | |
| 75 | OtherReference | |
| 76 | > const& other) | |
| 77 | : m_it1(other.m_it1) | |
| 78 | , m_end1(other.m_end1) | |
| 79 | , m_begin2(other.m_begin2) | |
| 80 | , m_it2(other.m_it2) | |
| 81 | { | |
| 82 | static const bool are_conv | |
| 83 | = boost::is_convertible<OtherIt1, Iterator1>::value | |
| 84 | && boost::is_convertible<OtherIt2, Iterator2>::value; | |
| 85 | ||
| 86 | BOOST_MPL_ASSERT_MSG((are_conv), | |
| 87 | NOT_CONVERTIBLE, | |
| 88 | (types<OtherIt1, OtherIt2>)); | |
| 89 | } | |
| 90 | ||
| 91 | private: | |
| 92 | friend class boost::iterator_core_access; | |
| 93 | ||
| 94 | template <typename It1, typename It2, typename V, typename R> | |
| 95 | friend class concatenate_iterator; | |
| 96 | ||
| 97 | inline Reference dereference() const | |
| 98 | { | |
| 99 | if ( m_it1 == m_end1 ) | |
| 100 | { | |
| 101 | return *m_it2; | |
| 102 | } | |
| 103 | return *m_it1; | |
| 104 | } | |
| 105 | ||
| 106 | template | |
| 107 | < | |
| 108 | typename OtherIt1, | |
| 109 | typename OtherIt2, | |
| 110 | typename OtherValue, | |
| 111 | typename OtherReference | |
| 112 | > | |
| 113 | inline bool equal(concatenate_iterator | |
| 114 | < | |
| 115 | OtherIt1, | |
| 116 | OtherIt2, | |
| 117 | OtherValue, | |
| 118 | OtherReference | |
| 119 | > const& other) const | |
| 120 | { | |
| 121 | return m_it1 == other.m_it1 && m_it2 == other.m_it2; | |
| 122 | } | |
| 123 | ||
| 124 | inline void increment() | |
| 125 | { | |
| 126 | if ( m_it1 == m_end1 ) | |
| 127 | { | |
| 128 | ++m_it2; | |
| 129 | } | |
| 130 | else | |
| 131 | { | |
| 132 | ++m_it1; | |
| 133 | } | |
| 134 | } | |
| 135 | ||
| 136 | inline void decrement() | |
| 137 | { | |
| 138 | if ( m_it2 == m_begin2 ) | |
| 139 | { | |
| 140 | --m_it1; | |
| 141 | } | |
| 142 | else | |
| 143 | { | |
| 144 | --m_it2; | |
| 145 | } | |
| 146 | } | |
| 147 | }; | |
| 148 | ||
| 149 | ||
| 150 | ||
| 151 | }} // namespace boost::geometry | |
| 152 | ||
| 153 | #endif // BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP |