stl_map.h

俄罗斯高人Mamaich的Pocket gcc编译器（运行在PocketPC上）的全部源代码。

     *  This function attempts to insert a (key, value) %pair into the %map.
     *  A %map relies on unique keys and thus a %pair is only inserted if its
     *  first element (the key) is not already present in the %map.
     *
     *  Insertion requires logarithmic time.
    */
    pair<iterator,bool>
    insert(const value_type& __x)
    { return _M_t.insert_unique(__x); }
  
    /**
     *  @brief Attempts to insert a std::pair into the %map.
     *  @param  position  An iterator that serves as a hint as to where the
     *                    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 element with key of @a x (may
     *           or may not be the %pair passed in).
     *
     *  This function is not concerned about whether the insertion took place,
     *  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.
     *
     *  See http://gcc.gnu.org/onlinedocs/libstdc++/23_containers/howto.html#4
     *  for more on "hinting".
     *
     *  Insertion requires logarithmic time (if the hint is not taken).
    */
    iterator
    insert(iterator position, const value_type& __x)
    { return _M_t.insert_unique(position, __x); }
  
    /**
     *  @brief A template function that attemps to insert a range of elements.
     *  @param  first  Iterator pointing to the start of the range to be
     *                 inserted.
     *  @param  last  Iterator pointing to the end of the range.
     *
     *  Complexity similar to that of the range constructor.
    */
    template <typename _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 elements according to the provided key.
     *  @param  x  Key of element to be erased.
     *  @return  The number of elements erased.
     *
     *  This function erases all the elements 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); }
  
    /**
     *  @brief  Swaps data with another %map.
     *  @param  x  A %map of the same element and allocator types.
     *
     *  This exchanges the elements between two maps in constant time.
     *  (It is only swapping a pointer, an integer, and an instance of
     *  the @c Compare type (which itself is often stateless and empty), so it
     *  should be quite fast.)
     *  Note that the global std::swap() function is specialized such that
     *  std::swap(m1,m2) will feed to this function.
    */
    void
    swap(map& __x) { _M_t.swap(__x._M_t); }
  
    /**
     *  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(); }
  
    // observers
    /**
     *  Returns the key comparison object out of which the %map was constructed.
    */
    key_compare
    key_comp() const { return _M_t.key_comp(); }
  
    /**
     *  Returns a value comparison object, built from the key comparison
     *  object out of which the %map was constructed.
    */
    value_compare
    value_comp() const { return value_compare(_M_t.key_comp()); }
  
    // [23.3.1.3] 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
     *  past-the-end ( @c 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
     *  past-the-end ( @c 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; for map the result will
     *  either be 0 (not present) or 1 (present).
    */
    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 multimaps.  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 multimaps.  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 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 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 <typename _K1, typename _T1, typename _C1, typename _A1>
    friend bool operator== (const map<_K1,_T1,_C1,_A1>&,
                            const map<_K1,_T1,_C1,_A1>&);
    template <typename _K1, typename _T1, typename _C1, typename _A1>
    friend bool operator< (const map<_K1,_T1,_C1,_A1>&,
                           const map<_K1,_T1,_C1,_A1>&);
  };
  
  
  /**
   *  @brief  Map equality comparison.
   *  @param  x  A %map.
   *  @param  y  A %map of the same type as @a x.
   *  @return  True iff the size and elements of the maps are equal.
   *
   *  This is an equivalence relation.  It is linear in the size of the
   *  maps.  Maps are considered equivalent if their sizes are equal,
   *  and if corresponding elements compare equal.
  */
  template <typename _Key, typename _Tp, typename _Compare, typename _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; }
  
  /**
   *  @brief  Map ordering relation.
   *  @param  x  A %map.
   *  @param  y  A %map of the same type as @a x.
   *  @return  True iff @a x is lexographically less than @a y.
   *
   *  This is a total ordering relation.  It is linear in the size of the
   *  maps.  The elements must be comparable with @c <.
   *
   *  See std::lexographical_compare() for how the determination is made.
  */
  template <typename _Key, typename _Tp, typename _Compare, typename _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; }
  
  /// Based on operator==
  template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
    inline bool
    operator!=(const map<_Key,_Tp,_Compare,_Alloc>& __x,
               const map<_Key,_Tp,_Compare,_Alloc>& __y)
    { return !(__x == __y); }
  
  /// Based on operator<
  template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
    inline bool
    operator>(const map<_Key,_Tp,_Compare,_Alloc>& __x,
              const map<_Key,_Tp,_Compare,_Alloc>& __y)
    { return __y < __x; }
  
  /// Based on operator<
  template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
    inline bool
    operator<=(const map<_Key,_Tp,_Compare,_Alloc>& __x,
               const map<_Key,_Tp,_Compare,_Alloc>& __y)
    { return !(__y < __x); }
  
  /// Based on operator<
  template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
    inline bool
    operator>=(const map<_Key,_Tp,_Compare,_Alloc>& __x,
               const map<_Key,_Tp,_Compare,_Alloc>& __y)
    { return !(__x < __y); }
  
  /// See std::map::swap().
  template <typename _Key, typename _Tp, typename _Compare, typename _Alloc>
    inline void
    swap(map<_Key,_Tp,_Compare,_Alloc>& __x, map<_Key,_Tp,_Compare,_Alloc>& __y)
    { __x.swap(__y); }
} // namespace std

#endif /* __GLIBCPP_INTERNAL_MAP_H */