hashtable.h

symbian上STL模板库的实现

  void swap(hashtable& __ht)
  {
    std::swap(_M_hash, __ht._M_hash);
    std::swap(_M_equals, __ht._M_equals);
    std::swap(_M_get_key, __ht._M_get_key);
    _M_buckets.swap(__ht._M_buckets);
    std::swap(_M_num_elements, __ht._M_num_elements);
  }

  iterator begin()
  {
    for (size_type __n = 0; __n < _M_buckets.size(); ++__n)
      if (_M_buckets[__n])
        return iterator(_M_buckets[__n], this);
    return end();
  }

  iterator end() { return iterator(0, this); }

  const_iterator begin() const
  {
    for (size_type __n = 0; __n < _M_buckets.size(); ++__n)
      if (_M_buckets[__n])
        return const_iterator(_M_buckets[__n], this);
    return end();
  }

  const_iterator end() const { return const_iterator(0, this); }

  template <class _Vl, class _Ky, class _HF, class _Ex, class _Eq, class _Al>
  friend bool operator== (const hashtable<_Vl, _Ky, _HF, _Ex, _Eq, _Al>&,
                          const hashtable<_Vl, _Ky, _HF, _Ex, _Eq, _Al>&);
public:

  size_type bucket_count() const { return _M_buckets.size(); }

  size_type max_bucket_count() const
    { return __stl_prime_list[(int)_S_num_primes - 1]; }

  size_type elems_in_bucket(size_type __bucket) const
  {
    size_type __result = 0;
    for (_Node* __cur = _M_buckets[__bucket]; __cur; __cur = __cur->_M_next)
      __result += 1;
    return __result;
  }

  pair<iterator, bool> insert_unique(const value_type& __obj)
  {
    resize(_M_num_elements + 1);
    return insert_unique_noresize(__obj);
  }

  iterator insert_equal(const value_type& __obj)
  {
    resize(_M_num_elements + 1);
    return insert_equal_noresize(__obj);
  }

  pair<iterator, bool> insert_unique_noresize(const value_type& __obj);
  iterator insert_equal_noresize(const value_type& __obj);

  template <class _InputIterator>
  void insert_unique(_InputIterator __f, _InputIterator __l)
  {
    insert_unique(__f, __l, __iterator_category(__f));
  }

  template <class _InputIterator>
  void insert_equal(_InputIterator __f, _InputIterator __l)
  {
    insert_equal(__f, __l, __iterator_category(__f));
  }

  template <class _InputIterator>
  void insert_unique(_InputIterator __f, _InputIterator __l,
                     input_iterator_tag)
  {
    for ( ; __f != __l; ++__f)
      insert_unique(*__f);
  }

  template <class _InputIterator>
  void insert_equal(_InputIterator __f, _InputIterator __l,
                    input_iterator_tag)
  {
    for ( ; __f != __l; ++__f)
      insert_equal(*__f);
  }

  template <class _ForwardIterator>
  void insert_unique(_ForwardIterator __f, _ForwardIterator __l,
                     forward_iterator_tag)
  {
    size_type __n = distance(__f, __l);
    resize(_M_num_elements + __n);
    for ( ; __n > 0; --__n, ++__f)
      insert_unique_noresize(*__f);
  }

  template <class _ForwardIterator>
  void insert_equal(_ForwardIterator __f, _ForwardIterator __l,
                    forward_iterator_tag)
  {
    size_type __n = distance(__f, __l);
    resize(_M_num_elements + __n);
    for ( ; __n > 0; --__n, ++__f)
      insert_equal_noresize(*__f);
  }

  reference find_or_insert(const value_type& __obj);

  iterator find(const key_type& __key)
  {
    size_type __n = _M_bkt_num_key(__key);
    _Node* __first;
    for ( __first = _M_buckets[__n];
          __first && !_M_equals(_M_get_key(__first->_M_val), __key);
          __first = __first->_M_next)
      {}
    return iterator(__first, this);
  }

  const_iterator find(const key_type& __key) const
  {
    size_type __n = _M_bkt_num_key(__key);
    const _Node* __first;
    for ( __first = _M_buckets[__n];
          __first && !_M_equals(_M_get_key(__first->_M_val), __key);
          __first = __first->_M_next)
      {}
    return const_iterator(__first, this);
  }

  size_type count(const key_type& __key) const
  {
    const size_type __n = _M_bkt_num_key(__key);
    size_type __result = 0;

    for (const _Node* __cur = _M_buckets[__n]; __cur; __cur = __cur->_M_next)
      if (_M_equals(_M_get_key(__cur->_M_val), __key))
        ++__result;
    return __result;
  }

  pair<iterator, iterator>
  equal_range(const key_type& __key);

  pair<const_iterator, const_iterator>
  equal_range(const key_type& __key) const;

  size_type erase(const key_type& __key);
  void erase(const iterator& __it);
  void erase(iterator __first, iterator __last);

  void erase(const const_iterator& __it);
  void erase(const_iterator __first, const_iterator __last);

  void resize(size_type __num_elements_hint);
  void clear();

private:
  size_type _M_next_size(size_type __n) const
    { return __stl_next_prime(__n); }

  void _M_initialize_buckets(size_type __n)
  {
    const size_type __n_buckets = _M_next_size(__n);
    _M_buckets.reserve(__n_buckets);
    _M_buckets.insert(_M_buckets.end(), __n_buckets, (_Node*) 0);
    _M_num_elements = 0;
  }

  size_type _M_bkt_num_key(const key_type& __key) const
  {
    return _M_bkt_num_key(__key, _M_buckets.size());
  }

  size_type _M_bkt_num(const value_type& __obj) const
  {
    return _M_bkt_num_key(_M_get_key(__obj));
  }

  size_type _M_bkt_num_key(const key_type& __key, size_t __n) const
  {
    return _M_hash(__key) % __n;
  }

  size_type _M_bkt_num(const value_type& __obj, size_t __n) const
  {
    return _M_bkt_num_key(_M_get_key(__obj), __n);
  }

  _Node* _M_new_node(const value_type& __obj)
  {
    _Node* __n = _M_get_node();
    __n->_M_next = 0;
    try {
      _Construct(&__n->_M_val, __obj);
      return __n;
    }
    catch(...)
      {
	_M_put_node(__n);
	__throw_exception_again;
      }
  }

  void _M_delete_node(_Node* __n)
  {
    _Destroy(&__n->_M_val);
    _M_put_node(__n);
  }

  void _M_erase_bucket(const size_type __n, _Node* __first, _Node* __last);
  void _M_erase_bucket(const size_type __n, _Node* __last);

  void _M_copy_from(const hashtable& __ht);

};

template <class _Val, class _Key, class _HF, class _ExK, class _EqK,
          class _All>
_Hashtable_iterator<_Val,_Key,_HF,_ExK,_EqK,_All>&
_Hashtable_iterator<_Val,_Key,_HF,_ExK,_EqK,_All>::operator++()
{
  const _Node* __old = _M_cur;
  _M_cur = _M_cur->_M_next;
  if (!_M_cur) {
    size_type __bucket = _M_ht->_M_bkt_num(__old->_M_val);
    while (!_M_cur && ++__bucket < _M_ht->_M_buckets.size())
      _M_cur = _M_ht->_M_buckets[__bucket];
  }
  return *this;
}

template <class _Val, class _Key, class _HF, class _ExK, class _EqK,
          class _All>
inline _Hashtable_iterator<_Val,_Key,_HF,_ExK,_EqK,_All>
_Hashtable_iterator<_Val,_Key,_HF,_ExK,_EqK,_All>::operator++(int)
{
  iterator __tmp = *this;
  ++*this;
  return __tmp;
}

template <class _Val, class _Key, class _HF, class _ExK, class _EqK,
          class _All>
_Hashtable_const_iterator<_Val,_Key,_HF,_ExK,_EqK,_All>&
_Hashtable_const_iterator<_Val,_Key,_HF,_ExK,_EqK,_All>::operator++()
{
  const _Node* __old = _M_cur;
  _M_cur = _M_cur->_M_next;
  if (!_M_cur) {
    size_type __bucket = _M_ht->_M_bkt_num(__old->_M_val);
    while (!_M_cur && ++__bucket < _M_ht->_M_buckets.size())
      _M_cur = _M_ht->_M_buckets[__bucket];
  }
  return *this;
}

template <class _Val, class _Key, class _HF, class _ExK, class _EqK,
          class _All>
inline _Hashtable_const_iterator<_Val,_Key,_HF,_ExK,_EqK,_All>
_Hashtable_const_iterator<_Val,_Key,_HF,_ExK,_EqK,_All>::operator++(int)
{
  const_iterator __tmp = *this;
  ++*this;
  return __tmp;
}

template <class _Val, class _Key, class _HF, class _Ex, class _Eq, class _All>
bool operator==(const hashtable<_Val,_Key,_HF,_Ex,_Eq,_All>& __ht1,
                const hashtable<_Val,_Key,_HF,_Ex,_Eq,_All>& __ht2)
{
  typedef typename hashtable<_Val,_Key,_HF,_Ex,_Eq,_All>::_Node _Node;
  if (__ht1._M_buckets.size() != __ht2._M_buckets.size())
    return false;
  for (size_t __n = 0; __n < __ht1._M_buckets.size(); ++__n) {
    _Node* __cur1 = __ht1._M_buckets[__n];
    _Node* __cur2 = __ht2._M_buckets[__n];
    // Check same length of lists
    for ( ; __cur1 && __cur2;
          __cur1 = __cur1->_M_next, __cur2 = __cur2->_M_next)
      {}
    if (__cur1 || __cur2)
      return false;
    // Now check one's elements are in the other
    for (__cur1 = __ht1._M_buckets[__n] ; __cur1; __cur1 = __cur1->_M_next)
    {
      bool _found__cur1 = false;
      for (_Node* __cur2 = __ht2._M_buckets[__n];
           __cur2; __cur2 = __cur2->_M_next)
      {
        if (__cur1->_M_val == __cur2->_M_val)
        {
          _found__cur1 = true;
          break;
        }
      }
      if (!_found__cur1)
        return false;
    }
  }
  return true;
}

template <class _Val, class _Key, class _HF, class _Ex, class _Eq, class _All>
inline bool operator!=(const hashtable<_Val,_Key,_HF,_Ex,_Eq,_All>& __ht1,
                       const hashtable<_Val,_Key,_HF,_Ex,_Eq,_All>& __ht2) {
  return !(__ht1 == __ht2);
}

template <class _Val, class _Key, class _HF, class _Extract, class _EqKey,
          class _All>
inline void swap(hashtable<_Val, _Key, _HF, _Extract, _EqKey, _All>& __ht1,
                 hashtable<_Val, _Key, _HF, _Extract, _EqKey, _All>& __ht2) {
  __ht1.swap(__ht2);
}


template <class _Val, class _Key, class _HF, class _Ex, class _Eq, class _All>
pair<typename hashtable<_Val,_Key,_HF,_Ex,_Eq,_All>::iterator, bool>
hashtable<_Val,_Key,_HF,_Ex,_Eq,_All>
  ::insert_unique_noresize(const value_type& __obj)
{
  const size_type __n = _M_bkt_num(__obj);
  _Node* __first = _M_buckets[__n];

  for (_Node* __cur = __first; __cur; __cur = __cur->_M_next)
    if (_M_equals(_M_get_key(__cur->_M_val), _M_get_key(__obj)))
      return pair<iterator, bool>(iterator(__cur, this), false);