stl_multimap.h

gcc3.2.1源代码

   *                    pair should be inserted.
   *  @param  x  Pair to be inserted (see std::make_pair for easy creation of
   *             pairs).
   *  @return An iterator that points to the inserted (key,value) pair.
   *
   *  This function inserts a (key, value) pair into the multimap.  Contrary
   *  to a std::map the multimap does not rely on unique keys and thus a
   *  multiple pairs with the same key can be inserted.
   *  Note that the first parameter is only a hint and can potentially
   *  improve the performance of the insertion process.  A bad hint would
   *  cause no gains in efficiency.
  */
  iterator insert(iterator __position, const value_type& __x) {
    return _M_t.insert_equal(__position, __x);
  }

  /**
   *  @brief A template function that attemps to insert elements from
   *         another range (possibly another multimap or standard container).
   *  @param  first  Iterator pointing to the start of the range to be
   *                 inserted.
   *  @param  last  Iterator pointing to the end of the range to be inserted.
  */
  template <class _InputIterator>
  void insert(_InputIterator __first, _InputIterator __last) {
    _M_t.insert_equal(__first, __last);
  }

  /**
   *  @brief Erases an element from a multimap.
   *  @param  position  An iterator pointing to the element to be erased.
   *
   *  This function erases an element, pointed to by the given iterator, from
   *  a mutlimap.  Note that this function only erases the element, and that
   *  if the element is itself a pointer, the pointed-to memory is not
   *  touched in any way.  Managing the pointer is the user's responsibilty.
  */
  void erase(iterator __position) { _M_t.erase(__position); }

  /**
   *  @brief Erases an element according to the provided key.
   *  @param  x  Key of element to be erased.
   *  @return  Doc me! (Number of elements erased?)
   *
   *  This function erases all elements, located by the given key, from a
   *  multimap.
   *  Note that this function only erases the element, and that if
   *  the element is itself a pointer, the pointed-to memory is not touched
   *  in any way.  Managing the pointer is the user's responsibilty.
  */
  size_type erase(const key_type& __x) { return _M_t.erase(__x); }

  /**
   *  @brief Erases a [first,last) range of elements from a multimap.
   *  @param  first  Iterator pointing to the start of the range to be erased.
   *  @param  last  Iterator pointing to the end of the range to be erased.
   *
   *  This function erases a sequence of elements from a multimap.
   *  Note that this function only erases the elements, and that if
   *  the elements themselves are pointers, the pointed-to memory is not
   *  touched in any way.  Managing the pointer is the user's responsibilty.
  */
  void erase(iterator __first, iterator __last)
    { _M_t.erase(__first, __last); }

  /** Erases all elements in a multimap.  Note that this function only erases
   *  the elements, and that if the elements themselves are pointers, the
   *  pointed-to memory is not touched in any way.  Managing the pointer is
   *  the user's responsibilty.
  */
  void clear() { _M_t.clear(); }

  // multimap operations:

  /**
   *  @brief Tries to locate an element in a multimap.
   *  @param  x  Key of (key, value) pair to be located.
   *  @return  Iterator pointing to sought-after (first matching?) element,
   *           or end() if not found.
   *
   *  This function takes a key and tries to locate the element with which
   *  the key matches.  If successful the function returns an iterator
   *  pointing to the sought after pair. If unsuccessful it returns the
   *  one past the end ( end() ) iterator.
  */
  iterator find(const key_type& __x) { return _M_t.find(__x); }

  /**
   *  @brief Tries to locate an element in a multimap.
   *  @param  x  Key of (key, value) pair to be located.
   *  @return  Read-only (constant) iterator pointing to sought-after (first
   *           matching?) element, or end() if not found.
   *
   *  This function takes a key and tries to locate the element with which
   *  the key matches.  If successful the function returns a constant iterator
   *  pointing to the sought after pair. If unsuccessful it returns the
   *  one past the end ( end() ) iterator.
  */
  const_iterator find(const key_type& __x) const { return _M_t.find(__x); }

  /**
   *  @brief Finds the number of elements with given key.
   *  @param  x  Key of (key, value) pairs to be located.
   *  @return Number of elements with specified key.
  */
  size_type count(const key_type& __x) const { return _M_t.count(__x); }

  /**
   *  @brief Finds the beginning of a subsequence matching given key.
   *  @param  x  Key of (key, value) pair to be located.
   *  @return  Iterator pointing to first element matching given key, or
   *           end() if not found.
   *
   *  This function returns the first element of a subsequence of elements
   *  that matches the given key.  If unsuccessful it returns an iterator
   *  pointing to the first element that has a greater value than given key
   *  or end() if no such element exists.
  */
  iterator lower_bound(const key_type& __x) {return _M_t.lower_bound(__x); }

  /**
   *  @brief Finds the beginning of a subsequence matching given key.
   *  @param  x  Key of (key, value) pair to be located.
   *  @return  Read-only (constant) iterator pointing to first element
   *           matching given key, or end() if not found.
   *
   *  This function returns the first element of a subsequence of elements
   *  that matches the given key.  If unsuccessful the iterator will point
   *  to the next greatest element or, if no such greater element exists, to
   *  end().
  */
  const_iterator lower_bound(const key_type& __x) const {
    return _M_t.lower_bound(__x);
  }

  /**
   *  @brief Finds the end of a subsequence matching given key.
   *  @param  x  Key of (key, value) pair to be located.
   *  @return Iterator pointing to last element matching given key.
  */
  iterator upper_bound(const key_type& __x) {return _M_t.upper_bound(__x); }

  /**
   *  @brief Finds the end of a subsequence matching given key.
   *  @param  x  Key of (key, value) pair to be located.
   *  @return  Read-only (constant) iterator pointing to last element matching
   *           given key.
  */
  const_iterator upper_bound(const key_type& __x) const {
    return _M_t.upper_bound(__x);
  }

  /**
   *  @brief Finds a subsequence matching given key.
   *  @param  x  Key of (key, value) pairs to be located.
   *  @return  Pair of iterators that possibly points to the subsequence
   *           matching given key.
   *
   *  This function improves on lower_bound() and upper_bound() by giving a more
   *  elegant and efficient solution.  It returns a pair of which the first
   *  element possibly points to the first element matching the given key
   *  and the second element possibly points to the last element matching the
   *  given key.  If unsuccessful the first element of the returned pair will
   *  contain an iterator pointing to the next greatest element or, if no such
   *  greater element exists, to end().
  */
  pair<iterator,iterator> equal_range(const key_type& __x) {
    return _M_t.equal_range(__x);
  }

  /**
   *  @brief Finds a subsequence matching given key.
   *  @param  x  Key of (key, value) pairs to be located.
   *  @return  Pair of read-only (constant) iterators that possibly points to
   *           the subsequence matching given key.
   *
   *  This function improves on lower_bound() and upper_bound() by giving a more
   *  elegant and efficient solution.  It returns a pair of which the first
   *  element possibly points to the first element matching the given key
   *  and the second element possibly points to the last element matching the
   *  given key.  If unsuccessful the first element of the returned pair will
   *  contain an iterator pointing to the next greatest element or, if no such
   *  a greater element exists, to end().
  */
  pair<const_iterator,const_iterator> equal_range(const key_type& __x) const {
    return _M_t.equal_range(__x);
  }

  template <class _K1, class _T1, class _C1, class _A1>
  friend bool operator== (const multimap<_K1, _T1, _C1, _A1>&,
                          const multimap<_K1, _T1, _C1, _A1>&);
  template <class _K1, class _T1, class _C1, class _A1>
  friend bool operator< (const multimap<_K1, _T1, _C1, _A1>&,
                         const multimap<_K1, _T1, _C1, _A1>&);
};

template <class _Key, class _Tp, class _Compare, class _Alloc>
inline bool operator==(const multimap<_Key,_Tp,_Compare,_Alloc>& __x,
                       const multimap<_Key,_Tp,_Compare,_Alloc>& __y) {
  return __x._M_t == __y._M_t;
}

template <class _Key, class _Tp, class _Compare, class _Alloc>
inline bool operator<(const multimap<_Key,_Tp,_Compare,_Alloc>& __x, 
                      const multimap<_Key,_Tp,_Compare,_Alloc>& __y) {
  return __x._M_t < __y._M_t;
}

template <class _Key, class _Tp, class _Compare, class _Alloc>
inline bool operator!=(const multimap<_Key,_Tp,_Compare,_Alloc>& __x, 
                       const multimap<_Key,_Tp,_Compare,_Alloc>& __y) {
  return !(__x == __y);
}

template <class _Key, class _Tp, class _Compare, class _Alloc>
inline bool operator>(const multimap<_Key,_Tp,_Compare,_Alloc>& __x, 
                      const multimap<_Key,_Tp,_Compare,_Alloc>& __y) {
  return __y < __x;
}

template <class _Key, class _Tp, class _Compare, class _Alloc>
inline bool operator<=(const multimap<_Key,_Tp,_Compare,_Alloc>& __x, 
                       const multimap<_Key,_Tp,_Compare,_Alloc>& __y) {
  return !(__y < __x);
}

template <class _Key, class _Tp, class _Compare, class _Alloc>
inline bool operator>=(const multimap<_Key,_Tp,_Compare,_Alloc>& __x, 
                       const multimap<_Key,_Tp,_Compare,_Alloc>& __y) {
  return !(__x < __y);
}

template <class _Key, class _Tp, class _Compare, class _Alloc>
inline void swap(multimap<_Key,_Tp,_Compare,_Alloc>& __x, 
                 multimap<_Key,_Tp,_Compare,_Alloc>& __y) {
  __x.swap(__y);
}

} // namespace std

#endif /* __GLIBCPP_INTERNAL_MULTIMAP_H */

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