+ { _M_t.swap(__x._M_t); }
+
+ // insert/erase
+ /**
+ * @brief Inserts an element into the %multiset.
+ * @param x Element to be inserted.
+ * @return An iterator that points to the inserted element.
+ *
+ * This function inserts an element into the %multiset. Contrary
+ * to a std::set the %multiset does not rely on unique keys and thus
+ * multiple copies of the same element can be inserted.
+ *
+ * Insertion requires logarithmic time.
+ */
+ iterator
+ insert(const value_type& __x)
+ { return _M_t._M_insert_equal(__x); }
+
+ /**
+ * @brief Inserts an element into the %multiset.
+ * @param position An iterator that serves as a hint as to where the
+ * element should be inserted.
+ * @param x Element to be inserted.
+ * @return An iterator that points to the inserted element.
+ *
+ * This function inserts an element into the %multiset. Contrary
+ * to a std::set the %multiset does not rely on unique keys and thus
+ * multiple copies of the same element 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.
+ *
+ * See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html
+ * 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._M_insert_equal_(__position, __x); }
+
+ /**
+ * @brief A template function that attempts 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._M_insert_equal(__first, __last); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Attempts to insert a list of elements into the %multiset.
+ * @param list A std::initializer_list<value_type> of elements
+ * to be inserted.
+ *
+ * Complexity similar to that of the range constructor.
+ */
+ void
+ insert(initializer_list<value_type> __l)
+ { this->insert(__l.begin(), __l.end()); }
+#endif
+
+ /**
+ * @brief Erases an element from a %multiset.
+ * @param position An iterator pointing to the element to be erased.
+ *
+ * This function erases an element, pointed to by the given iterator,
+ * from a %multiset. 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
+ * responsibility.
+ */
+ 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 elements located by the given key from a
+ * %multiset.
+ * 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 responsibility.
+ */
+ size_type
+ erase(const key_type& __x)
+ { return _M_t.erase(__x); }
+
+ /**
+ * @brief Erases a [first,last) range of elements from a %multiset.
+ * @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 %multiset.
+ * 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 responsibility.
+ */
+ void
+ erase(iterator __first, iterator __last)
+ { _M_t.erase(__first, __last); }
+
+ /**
+ * Erases all elements in a %multiset. 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 responsibility.
+ */
+ void
+ clear()
+ { _M_t.clear(); }
+
+ // multiset operations:
+
+ /**
+ * @brief Finds the number of elements with given key.
+ * @param x Key of elements to be located.
+ * @return Number of elements with specified key.
+ */
+ size_type
+ count(const key_type& __x) const
+ { return _M_t.count(__x); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 214. set::find() missing const overload
+ //@{
+ /**
+ * @brief Tries to locate an element in a %set.
+ * @param x Element 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 element. If unsuccessful it returns the
+ * past-the-end ( @c end() ) iterator.
+ */
+ iterator
+ find(const key_type& __x)
+ { return _M_t.find(__x); }
+
+ const_iterator
+ find(const key_type& __x) const
+ { return _M_t.find(__x); }
+ //@}
+
+ //@{
+ /**
+ * @brief Finds the beginning of a subsequence matching given key.
+ * @param x Key to be located.
+ * @return Iterator pointing to first element equal to or greater
+ * than key, or end().
+ *
+ * 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); }
+
+ 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 to be located.
+ * @return Iterator pointing to the first element
+ * greater than key, or end().
+ */
+ iterator
+ upper_bound(const key_type& __x)
+ { return _M_t.upper_bound(__x); }
+
+ 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 to be located.
+ * @return Pair of iterators that possibly points to the subsequence
+ * matching given key.
+ *
+ * This function is equivalent to
+ * @code
+ * std::make_pair(c.lower_bound(val),
+ * c.upper_bound(val))
+ * @endcode
+ * (but is faster than making the calls separately).
+ *
+ * This function probably only makes sense for multisets.
+ */
+ std::pair<iterator, iterator>
+ equal_range(const key_type& __x)
+ { return _M_t.equal_range(__x); }
+
+ std::pair<const_iterator, const_iterator>
+ equal_range(const key_type& __x) const
+ { return _M_t.equal_range(__x); }
+
+ template<typename _K1, typename _C1, typename _A1>
+ friend bool
+ operator==(const multiset<_K1, _C1, _A1>&,
+ const multiset<_K1, _C1, _A1>&);
+
+ template<typename _K1, typename _C1, typename _A1>
+ friend bool
+ operator< (const multiset<_K1, _C1, _A1>&,
+ const multiset<_K1, _C1, _A1>&);
+ };
+
+ /**
+ * @brief Multiset equality comparison.
+ * @param x A %multiset.
+ * @param y A %multiset of the same type as @a x.
+ * @return True iff the size and elements of the multisets are equal.
+ *
+ * This is an equivalence relation. It is linear in the size of the
+ * multisets.
+ * Multisets are considered equivalent if their sizes are equal, and if
+ * corresponding elements compare equal.
+ */
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline bool
+ operator==(const multiset<_Key, _Compare, _Alloc>& __x,
+ const multiset<_Key, _Compare, _Alloc>& __y)
+ { return __x._M_t == __y._M_t; }
+
+ /**
+ * @brief Multiset ordering relation.
+ * @param x A %multiset.
+ * @param y A %multiset of the same type as @a x.
+ * @return True iff @a x is lexicographically 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::lexicographical_compare() for how the determination is made.
+ */
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline bool
+ operator<(const multiset<_Key, _Compare, _Alloc>& __x,
+ const multiset<_Key, _Compare, _Alloc>& __y)
+ { return __x._M_t < __y._M_t; }
+
+ /// Returns !(x == y).
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline bool
+ operator!=(const multiset<_Key, _Compare, _Alloc>& __x,
+ const multiset<_Key, _Compare, _Alloc>& __y)
+ { return !(__x == __y); }
+
+ /// Returns y < x.
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline bool
+ operator>(const multiset<_Key,_Compare,_Alloc>& __x,
+ const multiset<_Key,_Compare,_Alloc>& __y)
+ { return __y < __x; }
+
+ /// Returns !(y < x)
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline bool
+ operator<=(const multiset<_Key, _Compare, _Alloc>& __x,
+ const multiset<_Key, _Compare, _Alloc>& __y)
+ { return !(__y < __x); }
+
+ /// Returns !(x < y)
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline bool
+ operator>=(const multiset<_Key, _Compare, _Alloc>& __x,
+ const multiset<_Key, _Compare, _Alloc>& __y)
+ { return !(__x < __y); }
+
+ /// See std::multiset::swap().
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline void
+ swap(multiset<_Key, _Compare, _Alloc>& __x,
+ multiset<_Key, _Compare, _Alloc>& __y)
+ { __x.swap(__y); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline void
+ swap(multiset<_Key, _Compare, _Alloc>&& __x,
+ multiset<_Key, _Compare, _Alloc>& __y)
+ { __x.swap(__y); }
+
+ template<typename _Key, typename _Compare, typename _Alloc>
+ inline void
+ swap(multiset<_Key, _Compare, _Alloc>& __x,
+ multiset<_Key, _Compare, _Alloc>&& __y)
+ { __x.swap(__y); }
+#endif
+
+_GLIBCXX_END_NESTED_NAMESPACE