0
 (9    gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
								     __last)),
		__gnu_debug::__base(__last), __n,
		__hf, __eql, __a) { }

      unordered_multimap(const unordered_multimap& __x) = default;

      unordered_multimap(const _Base& __x) 
      : _Base(__x) { }

      unordered_multimap(unordered_multimap&& __x) = default;

      unordered_multimap(initializer_list<value_type> __l,
			 size_type __n = 0,
			 const hasher& __hf = hasher(),
			 const key_equal& __eql = key_equal(),
			 const allocator_type& __a = allocator_type())
      : _Base(__l, __n, __hf, __eql, __a) { }

      ~unordered_multimap() noexcept { }

      unordered_multimap&
      operator=(const unordered_multimap& __x)
      {
	*static_cast<_Base*>(this) = __x;
	this->_M_invalidate_all();
	return *this;
      }

      unordered_multimap&
      operator=(unordered_multimap&& __x)
      {
	// NB: DR 1204.
	// NB: DR 675.
	__glibcxx_check_self_move_assign(__x);
	clear();
	swap(__x);
	return *this;
      }

      unordered_multimap&
      operator=(initializer_list<value_type> __l)
      {
	this->clear();
	this->insert(__l);
	return *this;
      }

      void
      swap(unordered_multimap& __x)
      {
	_Base::swap(__x);
	_Safe_base::_M_swap(__x);
      }

      void
      clear() noexcept
      {
	_Base::clear();
	this->_M_invalidate_all();
      }

      iterator 
      begin() noexcept
      { return iterator(_Base::begin(), this); }

      const_iterator
      begin() const noexcept
      { return const_iterator(_Base::begin(), this); }

      iterator
      end() noexcept
      { return iterator(_Base::end(), this); }

      const_iterator
      end() const noexcept
      { return const_iterator(_Base::end(), this); }

      const_iterator
      cbegin() const noexcept
      { return const_iterator(_Base::begin(), this); }

      const_iterator
      cend() const noexcept
      { return const_iterator(_Base::end(), this); }

      // local versions
      local_iterator
      begin(size_type __b)
      {
	__glibcxx_check_bucket_index(__b);
	return local_iterator(_Base::begin(__b), __b, this);
      }

      local_iterator
      end(size_type __b)
      {
	__glibcxx_check_bucket_index(__b);
	return local_iterator(_Base::end(__b), __b, this);
      }

      const_local_iterator
      begin(size_type __b) const
      {
	__glibcxx_check_bucket_index(__b);
	return const_local_iterator(_Base::begin(__b), __b, this);
      }

      const_local_iterator
      end(size_type __b) const
      {
	__glibcxx_check_bucket_index(__b);
	return const_local_iterator(_Base::end(__b), __b, this);
      }

      const_local_iterator
      cbegin(size_type __b) const
      {
	__glibcxx_check_bucket_index(__b);
	return const_local_iterator(_Base::cbegin(__b), __b, this);
      }

      const_local_iterator
      cend(size_type __b) const
      {
	__glibcxx_check_bucket_index(__b);
	return const_local_iterator(_Base::cend(__b), __b, this);
      }

      size_type
      bucket_size(size_type __b) const
      {
	__glibcxx_check_bucket_index(__b);
	return _Base::bucket_size(__b);
      }

      float
      max_load_factor() const noexcept
      { return _Base::max_load_factor(); }

      void
      max_load_factor(float __f)
      {
	__glibcxx_check_max_load_factor(__f);
	_Base::max_load_factor(__f);
      }

      template<typename... _Args>
	iterator
	emplace(_Args&&... __args)
	{
	  size_type __bucket_count = this->bucket_count();
	  _Base_iterator __it
	    = _Base::emplace(std::forward<_Args>(__args)...);
	  _M_check_rehashed(__bucket_count);
	  return iterator(__it, this);
	}

      template<typename... _Args>
	iterator
	emplace_hint(const_iterator __hint, _Args&&... __args)
	{
	  __glibcxx_check_insert(__hint);
	  size_type __bucket_count = this->bucket_count();
	  _Base_iterator __it = _Base::emplace_hint(__hint.base(),
					std::forward<_Args>(__args)...);
	  _M_check_rehashed(__bucket_count);
	  return iterator(__it, this);
	}

      iterator
      insert(const value_type& __obj)
      {
	size_type __bucket_count = this->bucket_count();
	_Ba