stl_map.h

gcc3.2.1源代码

   *  @return  An iterator that points to the inserted (key,value) pair.
   *
   *  This function is not concerned about whether the insertion took place
   *  or not and thus does not return a boolean like the single-argument
   *  insert() does.  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_unique(position, __x); }

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

  /**
   *  @brief Erases an element from a map.
   *  @param  position  An iterator pointing to the element to be erased.
   *
   *  This function erases an element, pointed to by the given iterator, from
   *  a map.  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 that match key? Only makes sense
   *           with multimap)
   *
   *  This function erases an element, located by the given key, from a map.
   *  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 map.
   *  @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 map.
   *  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 __first, iterator __last)
    { _M_t.erase(__first, __last); }

  /** Erases all elements in a map.  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(); }

  // map operations:

  /**
   *  @brief Tries to locate an element in a map.
   *  @param  x  Key of (key, value) pair to be located.
   *  @return  Iterator pointing to sought-after 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 map.
   *  @param  x  Key of (key, value) pair to be located.
   *  @return  Read-only (constant) iterator pointing to sought-after
   *           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.
   *
   *  This function only makes sense for multimaps.
  */
  size_type count(const key_type& __x) const {
    return _M_t.find(__x) == _M_t.end() ? 0 : 1;
  }

  /**
   *  @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 is useful only with std::multimap.  It 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 is useful only with std::multimap.  It 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.
   *
   *  This function only makes sense with multimaps.
  */
  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.
   *
   *  This function only makes sense with multimaps.
  */
  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().
   *
   *  This function only makes sense for multimaps.
  */
  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().
   *
   *  This function only makes sense for multimaps.
  */
  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 map<_K1, _T1, _C1, _A1>&,
                          const map<_K1, _T1, _C1, _A1>&);
  template <class _K1, class _T1, class _C1, class _A1>
  friend bool operator< (const map<_K1, _T1, _C1, _A1>&,
                         const map<_K1, _T1, _C1, _A1>&);
};

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

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

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

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

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

} // namespace std

#endif /* _CPP_BITS_STL_MAP_H */

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