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