wtf/HashIterators.h

   1 /*
   2  * Copyright (C) 2007 Apple Inc.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef WTF_HashIterators_h
  27 #define WTF_HashIterators_h
  28
  29 namespace WTF {
  30
  31     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstKeysIterator;
  32     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstValuesIterator;
  33     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableKeysIterator;
  34     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableValuesIterator;
  35
  36     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > {
  37     private:
  38         typedef std::pair<KeyType, MappedType> ValueType;
  39     public:
  40         typedef HashTableConstKeysIterator<HashTableType, KeyType, MappedType> Keys;
  41         typedef HashTableConstValuesIterator<HashTableType, KeyType, MappedType> Values;
  42
  43         HashTableConstIteratorAdapter(const typename HashTableType::const_iterator& impl) : m_impl(impl) {}
  44
  45         const ValueType* get() const { return (const ValueType*)m_impl.get(); }
  46         const ValueType& operator*() const { return *get(); }
  47         const ValueType* operator->() const { return get(); }
  48
  49         HashTableConstIteratorAdapter& operator++() { ++m_impl; return *this; }
  50         // postfix ++ intentionally omitted
  51
  52         Keys keys() { return Keys(*this); }
  53         Values values() { return Values(*this); }
  54
  55         typename HashTableType::const_iterator m_impl;
  56     };
  57
  58     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > {
  59     private:
  60         typedef std::pair<KeyType, MappedType> ValueType;
  61     public:
  62         typedef HashTableKeysIterator<HashTableType, KeyType, MappedType> Keys;
  63         typedef HashTableValuesIterator<HashTableType, KeyType, MappedType> Values;
  64
  65         HashTableIteratorAdapter(const typename HashTableType::iterator& impl) : m_impl(impl) {}
  66
  67         ValueType* get() const { return (ValueType*)m_impl.get(); }
  68         ValueType& operator*() const { return *get(); }
  69         ValueType* operator->() const { return get(); }
  70
  71         HashTableIteratorAdapter& operator++() { ++m_impl; return *this; }
  72         // postfix ++ intentionally omitted
  73
  74         operator HashTableConstIteratorAdapter<HashTableType, ValueType>() {
  75             typename HashTableType::const_iterator i = m_impl;
  76             return i;
  77         }
  78
  79         Keys keys() { return Keys(*this); }
  80         Values values() { return Values(*this); }
  81
  82         typename HashTableType::iterator m_impl;
  83     };
  84
  85     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstKeysIterator {
  86     private:
  87         typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;
  88
  89     public:
  90         HashTableConstKeysIterator(const ConstIterator& impl) : m_impl(impl) {}
  91
  92         const KeyType* get() const { return &(m_impl.get()->first); }
  93         const KeyType& operator*() const { return *get(); }
  94         const KeyType* operator->() const { return get(); }
  95
  96         HashTableConstKeysIterator& operator++() { ++m_impl; return *this; }
  97         // postfix ++ intentionally omitted
  98
  99         ConstIterator m_impl;
 100     };
 101
 102     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableConstValuesIterator {
 103     private:
 104         typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;
 105
 106     public:
 107         HashTableConstValuesIterator(const ConstIterator& impl) : m_impl(impl) {}
 108
 109         const MappedType* get() const { return &(m_impl.get()->second); }
 110         const MappedType& operator*() const { return *get(); }
 111         const MappedType* operator->() const { return get(); }
 112
 113         HashTableConstValuesIterator& operator++() { ++m_impl; return *this; }
 114         // postfix ++ intentionally omitted
 115
 116         ConstIterator m_impl;
 117     };
 118
 119     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableKeysIterator {
 120     private:
 121         typedef HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > Iterator;
 122         typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;
 123
 124     public:
 125         HashTableKeysIterator(const Iterator& impl) : m_impl(impl) {}
 126
 127         KeyType* get() const { return &(m_impl.get()->first); }
 128         KeyType& operator*() const { return *get(); }
 129         KeyType* operator->() const { return get(); }
 130
 131         HashTableKeysIterator& operator++() { ++m_impl; return *this; }
 132         // postfix ++ intentionally omitted
 133
 134         operator HashTableConstKeysIterator<HashTableType, KeyType, MappedType>() {
 135             ConstIterator i = m_impl;
 136             return i;
 137         }
 138
 139         Iterator m_impl;
 140     };
 141
 142     template<typename HashTableType, typename KeyType, typename MappedType> struct HashTableValuesIterator {
 143     private:
 144         typedef HashTableIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > Iterator;
 145         typedef HashTableConstIteratorAdapter<HashTableType, std::pair<KeyType, MappedType> > ConstIterator;
 146
 147     public:
 148         HashTableValuesIterator(const Iterator& impl) : m_impl(impl) {}
 149
 150         MappedType* get() const { return &(m_impl.get()->second); }
 151         MappedType& operator*() const { return *get(); }
 152         MappedType* operator->() const { return get(); }
 153
 154         HashTableValuesIterator& operator++() { ++m_impl; return *this; }
 155         // postfix ++ intentionally omitted
 156
 157         operator HashTableConstValuesIterator<HashTableType, KeyType, MappedType>() {
 158             ConstIterator i = m_impl;
 159             return i;
 160         }
 161
 162         Iterator m_impl;
 163     };
 164
 165     template<typename T, typename U, typename V>
 166         inline bool operator==(const HashTableConstKeysIterator<T, U, V>& a, const HashTableConstKeysIterator<T, U, V>& b)
 167     {
 168         return a.m_impl == b.m_impl;
 169     }
 170
 171     template<typename T, typename U, typename V>
 172         inline bool operator!=(const HashTableConstKeysIterator<T, U, V>& a, const HashTableConstKeysIterator<T, U, V>& b)
 173     {
 174         return a.m_impl != b.m_impl;
 175     }
 176
 177     template<typename T, typename U, typename V>
 178         inline bool operator==(const HashTableConstValuesIterator<T, U, V>& a, const HashTableConstValuesIterator<T, U, V>& b)
 179     {
 180         return a.m_impl == b.m_impl;
 181     }
 182
 183     template<typename T, typename U, typename V>
 184         inline bool operator!=(const HashTableConstValuesIterator<T, U, V>& a, const HashTableConstValuesIterator<T, U, V>& b)
 185     {
 186         return a.m_impl != b.m_impl;
 187     }
 188
 189     template<typename T, typename U, typename V>
 190         inline bool operator==(const HashTableKeysIterator<T, U, V>& a, const HashTableKeysIterator<T, U, V>& b)
 191     {
 192         return a.m_impl == b.m_impl;
 193     }
 194
 195     template<typename T, typename U, typename V>
 196         inline bool operator!=(const HashTableKeysIterator<T, U, V>& a, const HashTableKeysIterator<T, U, V>& b)
 197     {
 198         return a.m_impl != b.m_impl;
 199     }
 200
 201     template<typename T, typename U, typename V>
 202         inline bool operator==(const HashTableValuesIterator<T, U, V>& a, const HashTableValuesIterator<T, U, V>& b)
 203     {
 204         return a.m_impl == b.m_impl;
 205     }
 206
 207     template<typename T, typename U, typename V>
 208         inline bool operator!=(const HashTableValuesIterator<T, U, V>& a, const HashTableValuesIterator<T, U, V>& b)
 209     {
 210         return a.m_impl != b.m_impl;
 211     }
 212
 213
 214 } // namespace WTF
 215
 216 #endif // WTF_HashIterators_h