STL源码剖析——hash_map和hash_multimap

SGI STL中的map底层以红黑树实现，hash_map以hash table实现。

hash_map不允许插入重新键值，hash_multimap允许插入重复键值。这两者的关系就像map和multimap的关系。底层的hash table提供的大部分的操作，hash_map(hash_multimap)大部分都是直接调用hash table的函数。

hash_multimap和hash_map的区别就像multimap与map的区别一样，hash_multimap的底层机制是基于hash table，它可以存在重复的键值，所以插入函数使用insert_equal()，hash_multimap和hash_map一样，容器的内容不自动排序。

hash_map

G++ 2.91.57，cygnus\cygwin-b20\include\g++\stl_hash_map.h 完整列表
/*
 * Copyright (c) 1996
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 */

/* NOTE: This is an internal header file, included by other STL headers.
 *   You should not attempt to use it directly.
 */

#ifndef __SGI_STL_INTERNAL_HASH_MAP_H
#define __SGI_STL_INTERNAL_HASH_MAP_H


__STL_BEGIN_NAMESPACE

#if defined(__sgi) && !defined(__GNUC__) && (_MIPS_SIM != _MIPS_SIM_ABI32)
#pragma set woff 1174
#endif

#ifndef __STL_LIMITED_DEFAULT_TEMPLATES
// hash<> 是个 function object，定义于  中
// 例：hash::operator()(int x) const { return x; }
template ,
          class EqualKey = equal_to,
          class Alloc = alloc>
#else
template 
#endif
class hash_map
{
private:
  // 以下使用的 select1st<> 定义于  中。
  typedef hashtable, Key, HashFcn,
                    select1st >, EqualKey, Alloc> ht;
  ht rep;	// 底层以 hash table 完成

public:
  typedef typename ht::key_type key_type;
  typedef T data_type;
  typedef T mapped_type;
  typedef typename ht::value_type value_type;
  typedef typename ht::hasher hasher;
  typedef typename ht::key_equal key_equal;

  typedef typename ht::size_type size_type;
  typedef typename ht::difference_type difference_type;
  typedef typename ht::pointer pointer;
  typedef typename ht::const_pointer const_pointer;
  typedef typename ht::reference reference;
  typedef typename ht::const_reference const_reference;

  typedef typename ht::iterator iterator;
  typedef typename ht::const_iterator const_iterator;

  hasher hash_funct() const { return rep.hash_funct(); }
  key_equal key_eq() const { return rep.key_eq(); }

public:
  //预设使用100的 vector buckets,将有 hash table调整为大于100的质数
  hash_map() : rep(100, hasher(), key_equal()) {}
  explicit hash_map(size_type n) : rep(n, hasher(), key_equal()) {}
  hash_map(size_type n, const hasher& hf) : rep(n, hf, key_equal()) {}
  hash_map(size_type n, const hasher& hf, const key_equal& eql)
    : rep(n, hf, eql) {}

#ifdef __STL_MEMBER_TEMPLATES
  // 以下，插入全部使用 insert_unique()，不允许键值重复。
  template 
  hash_map(InputIterator f, InputIterator l)
    : rep(100, hasher(), key_equal()) { rep.insert_unique(f, l); }
  template 
  hash_map(InputIterator f, InputIterator l, size_type n)
    : rep(n, hasher(), key_equal()) { rep.insert_unique(f, l); }
  template 
  hash_map(InputIterator f, InputIterator l, size_type n,
           const hasher& hf)
    : rep(n, hf, key_equal()) { rep.insert_unique(f, l); }
  template 
  hash_map(InputIterator f, InputIterator l, size_type n,
           const hasher& hf, const key_equal& eql)
    : rep(n, hf, eql) { rep.insert_unique(f, l); }

#else
  hash_map(const value_type* f, const value_type* l)
    : rep(100, hasher(), key_equal()) { rep.insert_unique(f, l); }
  hash_map(const value_type* f, const value_type* l, size_type n)
    : rep(n, hasher(), key_equal()) { rep.insert_unique(f, l); }
  hash_map(const value_type* f, const value_type* l, size_type n,
           const hasher& hf)
    : rep(n, hf, key_equal()) { rep.insert_unique(f, l); }
  hash_map(const value_type* f, const value_type* l, size_type n,
           const hasher& hf, const key_equal& eql)
    : rep(n, hf, eql) { rep.insert_unique(f, l); }

  hash_map(const_iterator f, const_iterator l)
    : rep(100, hasher(), key_equal()) { rep.insert_unique(f, l); }
  hash_map(const_iterator f, const_iterator l, size_type n)
    : rep(n, hasher(), key_equal()) { rep.insert_unique(f, l); }
  hash_map(const_iterator f, const_iterator l, size_type n,
           const hasher& hf)
    : rep(n, hf, key_equal()) { rep.insert_unique(f, l); }
  hash_map(const_iterator f, const_iterator l, size_type n,
           const hasher& hf, const key_equal& eql)
    : rep(n, hf, eql) { rep.insert_unique(f, l); }
#endif /*__STL_MEMBER_TEMPLATES */

public:
  // 所有操作几乎都有 hash table 对应的版本，直接调用即可。
  size_type size() const { return rep.size(); }
  size_type max_size() const { return rep.max_size(); }
  bool empty() const { return rep.empty(); }
  void swap(hash_map& hs) { rep.swap(hs.rep); }
  friend bool
  operator== __STL_NULL_TMPL_ARGS (const hash_map&, const hash_map&);

  iterator begin() { return rep.begin(); }
  iterator end() { return rep.end(); }
  const_iterator begin() const { return rep.begin(); }
  const_iterator end() const { return rep.end(); }

public:
  pair insert(const value_type& obj)
    { return rep.insert_unique(obj); }
#ifdef __STL_MEMBER_TEMPLATES
  template 
  void insert(InputIterator f, InputIterator l) { rep.insert_unique(f,l); }
#else
  void insert(const value_type* f, const value_type* l) {
    rep.insert_unique(f,l);
  }
  void insert(const_iterator f, const_iterator l) { rep.insert_unique(f, l); }
#endif /*__STL_MEMBER_TEMPLATES */
  pair insert_noresize(const value_type& obj)
    { return rep.insert_unique_noresize(obj); }    

  iterator find(const key_type& key) { return rep.find(key); }
  const_iterator find(const key_type& key) const { return rep.find(key); }

  T& operator[](const key_type& key) {
    return rep.find_or_insert(value_type(key, T())).second;
  }

  size_type count(const key_type& key) const { return rep.count(key); }
  
  pair equal_range(const key_type& key)
    { return rep.equal_range(key); }
  pair equal_range(const key_type& key) const
    { return rep.equal_range(key); }

  size_type erase(const key_type& key) {return rep.erase(key); }
  void erase(iterator it) { rep.erase(it); }
  void erase(iterator f, iterator l) { rep.erase(f, l); }
  void clear() { rep.clear(); }

public:
  void resize(size_type hint) { rep.resize(hint); }
  size_type bucket_count() const { return rep.bucket_count(); }
  size_type max_bucket_count() const { return rep.max_bucket_count(); }
  size_type elems_in_bucket(size_type n) const
    { return rep.elems_in_bucket(n); }
};

template 
inline bool operator==(const hash_map& hm1,
                       const hash_map& hm2)
{
  return hm1.rep == hm2.rep;
}

#ifdef __STL_FUNCTION_TMPL_PARTIAL_ORDER

template 
inline void swap(hash_map& hm1,
                 hash_map& hm2)
{
  hm1.swap(hm2);
}

#endif /* __STL_FUNCTION_TMPL_PARTIAL_ORDER */

#ifndef __STL_LIMITED_DEFAULT_TEMPLATES
template ,
          class EqualKey = equal_to,
          class Alloc = alloc>
#else
template 
#endif
//和hash_map几乎完全一样，只是允许插入重复键值
class hash_multimap
{
private:
  typedef hashtable, Key, HashFcn,
                    select1st >, EqualKey, Alloc> ht;
  ht rep;

public:
  typedef typename ht::key_type key_type;
  typedef T data_type;
  typedef T mapped_type;
  typedef typename ht::value_type value_type;
  typedef typename ht::hasher hasher;
  typedef typename ht::key_equal key_equal;

  typedef typename ht::size_type size_type;
  typedef typename ht::difference_type difference_type;
  typedef typename ht::pointer pointer;
  typedef typename ht::const_pointer const_pointer;
  typedef typename ht::reference reference;
  typedef typename ht::const_reference const_reference;

  typedef typename ht::iterator iterator;
  typedef typename ht::const_iterator const_iterator;

  hasher hash_funct() const { return rep.hash_funct(); }
  key_equal key_eq() const { return rep.key_eq(); }

public:
  hash_multimap() : rep(100, hasher(), key_equal()) {}
  explicit hash_multimap(size_type n) : rep(n, hasher(), key_equal()) {}
  hash_multimap(size_type n, const hasher& hf) : rep(n, hf, key_equal()) {}
  hash_multimap(size_type n, const hasher& hf, const key_equal& eql)
    : rep(n, hf, eql) {}

#ifdef __STL_MEMBER_TEMPLATES
// 以下，插入全部使用 insert_equal()，允许键值重复。
  template 
  hash_multimap(InputIterator f, InputIterator l)
    : rep(100, hasher(), key_equal()) { rep.insert_equal(f, l); }
  template 
  hash_multimap(InputIterator f, InputIterator l, size_type n)
    : rep(n, hasher(), key_equal()) { rep.insert_equal(f, l); }
  template 
  hash_multimap(InputIterator f, InputIterator l, size_type n,
                const hasher& hf)
    : rep(n, hf, key_equal()) { rep.insert_equal(f, l); }
  template 
  hash_multimap(InputIterator f, InputIterator l, size_type n,
                const hasher& hf, const key_equal& eql)
    : rep(n, hf, eql) { rep.insert_equal(f, l); }

#else
  hash_multimap(const value_type* f, const value_type* l)
    : rep(100, hasher(), key_equal()) { rep.insert_equal(f, l); }
  hash_multimap(const value_type* f, const value_type* l, size_type n)
    : rep(n, hasher(), key_equal()) { rep.insert_equal(f, l); }
  hash_multimap(const value_type* f, const value_type* l, size_type n,
                const hasher& hf)
    : rep(n, hf, key_equal()) { rep.insert_equal(f, l); }
  hash_multimap(const value_type* f, const value_type* l, size_type n,
                const hasher& hf, const key_equal& eql)
    : rep(n, hf, eql) { rep.insert_equal(f, l); }

  hash_multimap(const_iterator f, const_iterator l)
    : rep(100, hasher(), key_equal()) { rep.insert_equal(f, l); }
  hash_multimap(const_iterator f, const_iterator l, size_type n)
    : rep(n, hasher(), key_equal()) { rep.insert_equal(f, l); }
  hash_multimap(const_iterator f, const_iterator l, size_type n,
                const hasher& hf)
    : rep(n, hf, key_equal()) { rep.insert_equal(f, l); }
  hash_multimap(const_iterator f, const_iterator l, size_type n,
                const hasher& hf, const key_equal& eql)
    : rep(n, hf, eql) { rep.insert_equal(f, l); }
#endif /*__STL_MEMBER_TEMPLATES */

public:
  size_type size() const { return rep.size(); }
  size_type max_size() const { return rep.max_size(); }
  bool empty() const { return rep.empty(); }
  void swap(hash_multimap& hs) { rep.swap(hs.rep); }
  friend bool
  operator== __STL_NULL_TMPL_ARGS (const hash_multimap&, const hash_multimap&);

  iterator begin() { return rep.begin(); }
  iterator end() { return rep.end(); }
  const_iterator begin() const { return rep.begin(); }
  const_iterator end() const { return rep.end(); }

public:
  iterator insert(const value_type& obj) { return rep.insert_equal(obj); }
#ifdef __STL_MEMBER_TEMPLATES
  template 
  void insert(InputIterator f, InputIterator l) { rep.insert_equal(f,l); }
#else
  void insert(const value_type* f, const value_type* l) {
    rep.insert_equal(f,l);
  }
  void insert(const_iterator f, const_iterator l) { rep.insert_equal(f, l); }
#endif /*__STL_MEMBER_TEMPLATES */
  iterator insert_noresize(const value_type& obj)
    { return rep.insert_equal_noresize(obj); }    

  iterator find(const key_type& key) { return rep.find(key); }
  const_iterator find(const key_type& key) const { return rep.find(key); }

  size_type count(const key_type& key) const { return rep.count(key); }
  
  pair equal_range(const key_type& key)
    { return rep.equal_range(key); }
  pair equal_range(const key_type& key) const
    { return rep.equal_range(key); }

  size_type erase(const key_type& key) {return rep.erase(key); }
  void erase(iterator it) { rep.erase(it); }
  void erase(iterator f, iterator l) { rep.erase(f, l); }
  void clear() { rep.clear(); }

public:
  void resize(size_type hint) { rep.resize(hint); }
  size_type bucket_count() const { return rep.bucket_count(); }
  size_type max_bucket_count() const { return rep.max_bucket_count(); }
  size_type elems_in_bucket(size_type n) const
    { return rep.elems_in_bucket(n); }
};

template 
inline bool operator==(const hash_multimap& hm1,
                       const hash_multimap& hm2)
{
  return hm1.rep == hm2.rep;
}

#ifdef __STL_FUNCTION_TMPL_PARTIAL_ORDER

template 
inline void swap(hash_multimap& hm1,
                 hash_multimap& hm2)
{
  hm1.swap(hm2);
}

#endif /* __STL_FUNCTION_TMPL_PARTIAL_ORDER */

#if defined(__sgi) && !defined(__GNUC__) && (_MIPS_SIM != _MIPS_SIM_ABI32)
#pragma reset woff 1174
#endif

__STL_END_NAMESPACE

#endif /* __SGI_STL_INTERNAL_HASH_MAP_H */

// Local Variables:
// mode:C++
// End:

hash_multimap

// Forward declaration of equality operator; needed for friend declaration.

//hash_multimap与hash_map的差别就是插入函数，前者的插入函数是采用底层机制hash table的insert_equal()
//后者则采用insert_unique()
//其他的功能都和hash_map类似
//hash_multimap允许key重复
//这里就不再进行注释了，可以参考hash_map的解析
template ),
          class _EqualKey __STL_DEPENDENT_DEFAULT_TMPL(equal_to<_Key>),
          class _Alloc =  __STL_DEFAULT_ALLOCATOR(_Tp) >
class hash_multimap;

template 
inline bool 
operator==(const hash_multimap<_Key,_Tp,_HF,_EqKey,_Alloc>& __hm1,
           const hash_multimap<_Key,_Tp,_HF,_EqKey,_Alloc>& __hm2);

template 
class hash_multimap
{
  // requirements:

  __STL_CLASS_REQUIRES(_Key, _Assignable);
  __STL_CLASS_REQUIRES(_Tp, _Assignable);
  __STL_CLASS_UNARY_FUNCTION_CHECK(_HashFcn, size_t, _Key);
  __STL_CLASS_BINARY_FUNCTION_CHECK(_EqualKey, bool, _Key, _Key);

private:
  typedef hashtable, _Key, _HashFcn,
                    _Select1st >, _EqualKey, _Alloc> 
          _Ht;
  _Ht _M_ht;

public:
  typedef typename _Ht::key_type key_type;
  typedef _Tp data_type;
  typedef _Tp mapped_type;
  typedef typename _Ht::value_type value_type;
  typedef typename _Ht::hasher hasher;
  typedef typename _Ht::key_equal key_equal;

  typedef typename _Ht::size_type size_type;
  typedef typename _Ht::difference_type difference_type;
  typedef typename _Ht::pointer pointer;
  typedef typename _Ht::const_pointer const_pointer;
  typedef typename _Ht::reference reference;
  typedef typename _Ht::const_reference const_reference;

  typedef typename _Ht::iterator iterator;
  typedef typename _Ht::const_iterator const_iterator;

  typedef typename _Ht::allocator_type allocator_type;

  hasher hash_funct() const { return _M_ht.hash_funct(); }
  key_equal key_eq() const { return _M_ht.key_eq(); }
  allocator_type get_allocator() const { return _M_ht.get_allocator(); }

public:
  hash_multimap() : _M_ht(100, hasher(), key_equal(), allocator_type()) {}
  explicit hash_multimap(size_type __n)
    : _M_ht(__n, hasher(), key_equal(), allocator_type()) {}
  hash_multimap(size_type __n, const hasher& __hf)
    : _M_ht(__n, __hf, key_equal(), allocator_type()) {}
  hash_multimap(size_type __n, const hasher& __hf, const key_equal& __eql,
                const allocator_type& __a = allocator_type())
    : _M_ht(__n, __hf, __eql, __a) {}

#ifdef __STL_MEMBER_TEMPLATES
  template 
  hash_multimap(_InputIterator __f, _InputIterator __l)
    : _M_ht(100, hasher(), key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  template 
  hash_multimap(_InputIterator __f, _InputIterator __l, size_type __n)
    : _M_ht(__n, hasher(), key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  template 
  hash_multimap(_InputIterator __f, _InputIterator __l, size_type __n,
                const hasher& __hf)
    : _M_ht(__n, __hf, key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  template 
  hash_multimap(_InputIterator __f, _InputIterator __l, size_type __n,
                const hasher& __hf, const key_equal& __eql,
                const allocator_type& __a = allocator_type())
    : _M_ht(__n, __hf, __eql, __a)
    { _M_ht.insert_equal(__f, __l); }

#else
  hash_multimap(const value_type* __f, const value_type* __l)
    : _M_ht(100, hasher(), key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  hash_multimap(const value_type* __f, const value_type* __l, size_type __n)
    : _M_ht(__n, hasher(), key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  hash_multimap(const value_type* __f, const value_type* __l, size_type __n,
                const hasher& __hf)
    : _M_ht(__n, __hf, key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  hash_multimap(const value_type* __f, const value_type* __l, size_type __n,
                const hasher& __hf, const key_equal& __eql,
                const allocator_type& __a = allocator_type())
    : _M_ht(__n, __hf, __eql, __a)
    { _M_ht.insert_equal(__f, __l); }

  hash_multimap(const_iterator __f, const_iterator __l)
    : _M_ht(100, hasher(), key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  hash_multimap(const_iterator __f, const_iterator __l, size_type __n)
    : _M_ht(__n, hasher(), key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  hash_multimap(const_iterator __f, const_iterator __l, size_type __n,
                const hasher& __hf)
    : _M_ht(__n, __hf, key_equal(), allocator_type())
    { _M_ht.insert_equal(__f, __l); }
  hash_multimap(const_iterator __f, const_iterator __l, size_type __n,
                const hasher& __hf, const key_equal& __eql,
                const allocator_type& __a = allocator_type())
    : _M_ht(__n, __hf, __eql, __a)
    { _M_ht.insert_equal(__f, __l); }
#endif /*__STL_MEMBER_TEMPLATES */

public:
  size_type size() const { return _M_ht.size(); }
  size_type max_size() const { return _M_ht.max_size(); }
  bool empty() const { return _M_ht.empty(); }
  void swap(hash_multimap& __hs) { _M_ht.swap(__hs._M_ht); }

#ifdef __STL_MEMBER_TEMPLATES
  template 
  friend bool operator== (const hash_multimap<_K1, _T1, _HF, _EqK, _Al>&,
                          const hash_multimap<_K1, _T1, _HF, _EqK, _Al>&);
#else /* __STL_MEMBER_TEMPLATES */
  friend bool __STD_QUALIFIER
  operator== __STL_NULL_TMPL_ARGS (const hash_multimap&,const hash_multimap&);
#endif /* __STL_MEMBER_TEMPLATES */

  iterator begin() { return _M_ht.begin(); }
  iterator end() { return _M_ht.end(); }
  const_iterator begin() const { return _M_ht.begin(); }
  const_iterator end() const { return _M_ht.end(); }

public:
  iterator insert(const value_type& __obj) 
    { return _M_ht.insert_equal(__obj); }
#ifdef __STL_MEMBER_TEMPLATES
  template 
  void insert(_InputIterator __f, _InputIterator __l) 
    { _M_ht.insert_equal(__f,__l); }
#else
  void insert(const value_type* __f, const value_type* __l) {
    _M_ht.insert_equal(__f,__l);
  }
  void insert(const_iterator __f, const_iterator __l) 
    { _M_ht.insert_equal(__f, __l); }
#endif /*__STL_MEMBER_TEMPLATES */
  iterator insert_noresize(const value_type& __obj)
    { return _M_ht.insert_equal_noresize(__obj); }    

  iterator find(const key_type& __key) { return _M_ht.find(__key); }
  const_iterator find(const key_type& __key) const 
    { return _M_ht.find(__key); }

  size_type count(const key_type& __key) const { return _M_ht.count(__key); }
  
  pair equal_range(const key_type& __key)
    { return _M_ht.equal_range(__key); }
  pair
  equal_range(const key_type& __key) const
    { return _M_ht.equal_range(__key); }

  size_type erase(const key_type& __key) {return _M_ht.erase(__key); }
  void erase(iterator __it) { _M_ht.erase(__it); }
  void erase(iterator __f, iterator __l) { _M_ht.erase(__f, __l); }
  void clear() { _M_ht.clear(); }

public:
  void resize(size_type __hint) { _M_ht.resize(__hint); }
  size_type bucket_count() const { return _M_ht.bucket_count(); }
  size_type max_bucket_count() const { return _M_ht.max_bucket_count(); }
  size_type elems_in_bucket(size_type __n) const
    { return _M_ht.elems_in_bucket(__n); }
};

template 
inline bool 
operator==(const hash_multimap<_Key,_Tp,_HF,_EqKey,_Alloc>& __hm1,
           const hash_multimap<_Key,_Tp,_HF,_EqKey,_Alloc>& __hm2)
{
  return __hm1._M_ht == __hm2._M_ht;
}

#ifdef __STL_FUNCTION_TMPL_PARTIAL_ORDER

template 
inline bool 
operator!=(const hash_multimap<_Key,_Tp,_HF,_EqKey,_Alloc>& __hm1,
           const hash_multimap<_Key,_Tp,_HF,_EqKey,_Alloc>& __hm2) {
  return !(__hm1 == __hm2);
}

template 
inline void 
swap(hash_multimap<_Key,_Tp,_HashFcn,_EqlKey,_Alloc>& __hm1,
     hash_multimap<_Key,_Tp,_HashFcn,_EqlKey,_Alloc>& __hm2)
{
  __hm1.swap(__hm2);
}

#endif /* __STL_FUNCTION_TMPL_PARTIAL_ORDER */

// Specialization of insert_iterator so that it will work for hash_map
// and hash_multimap.

#ifdef __STL_CLASS_PARTIAL_SPECIALIZATION

template 
class insert_iterator > {
protected:
  typedef hash_map<_Key, _Tp, _HashFn, _EqKey, _Alloc> _Container;
  _Container* container;
public:
  typedef _Container          container_type;
  typedef output_iterator_tag iterator_category;
  typedef void                value_type;
  typedef void                difference_type;
  typedef void                pointer;
  typedef void                reference;

  insert_iterator(_Container& __x) : container(&__x) {}
  insert_iterator(_Container& __x, typename _Container::iterator)
    : container(&__x) {}
  insert_iterator<_Container>&
  operator=(const typename _Container::value_type& __value) { 
    container->insert(__value);
    return *this;
  }
  insert_iterator<_Container>& operator*() { return *this; }
  insert_iterator<_Container>& operator++() { return *this; }
  insert_iterator<_Container>& operator++(int) { return *this; }
};

template 
class insert_iterator > {
protected:
  typedef hash_multimap<_Key, _Tp, _HashFn, _EqKey, _Alloc> _Container;
  _Container* container;
  typename _Container::iterator iter;
public:
  typedef _Container          container_type;
  typedef output_iterator_tag iterator_category;
  typedef void                value_type;
  typedef void                difference_type;
  typedef void                pointer;
  typedef void                reference;

  insert_iterator(_Container& __x) : container(&__x) {}
  insert_iterator(_Container& __x, typename _Container::iterator)
    : container(&__x) {}
  insert_iterator<_Container>&
  operator=(const typename _Container::value_type& __value) { 
    container->insert(__value);
    return *this;
  }
  insert_iterator<_Container>& operator*() { return *this; }
  insert_iterator<_Container>& operator++() { return *this; }
  insert_iterator<_Container>& operator++(int) { return *this; }
};

#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */

#if defined(__sgi) && !defined(__GNUC__) && (_MIPS_SIM != _MIPS_SIM_ABI32)
#pragma reset woff 1174
#pragma reset woff 1375
#endif

__STL_END_NAMESPACE

#endif /* __SGI_STL_INTERNAL_HASH_MAP_H */

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// mode:C++
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