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// Debugging unordered_map/unordered_multimap implementation -*- C++ -*-

// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012

// Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// .

/** @file debug/unordered_map

 *  This file is a GNU debug extension to the Standard C++ Library.

 */

#ifndef _GLIBCXX_DEBUG_UNORDERED_MAP

#define _GLIBCXX_DEBUG_UNORDERED_MAP 1

#if __cplusplus < 201103L

# include 

#else

# include 

#include 

#include 

#include 

namespace std _GLIBCXX_VISIBILITY(default)

{

namespace __debug

{

  /// Class std::unordered_map with safety/checking/debug instrumentation.

  template

           typename _Hash = std::hash<_Key>,

           typename _Pred = std::equal_to<_Key>,

           typename _Alloc = std::allocator<_Key> >

    class unordered_map

    : public _GLIBCXX_STD_C::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>,

      public __gnu_debug::_Safe_unordered_container

                                                        _Hash, _Pred, _Alloc> >

    {

      typedef _GLIBCXX_STD_C::unordered_map<_Key, _Tp, _Hash,

                                            _Pred, _Alloc> _Base;

      typedef __gnu_debug::_Safe_unordered_container _Safe_base;

      typedef typename _Base::const_iterator _Base_const_iterator;

      typedef typename _Base::iterator _Base_iterator;

      typedef typename _Base::const_local_iterator _Base_const_local_iterator;

      typedef typename _Base::local_iterator _Base_local_iterator;

    public:

      typedef typename _Base::size_type       size_type;

      typedef typename _Base::hasher          hasher;

      typedef typename _Base::key_equal       key_equal;

      typedef typename _Base::allocator_type  allocator_type;

      typedef typename _Base::key_type        key_type;

      typedef typename _Base::value_type      value_type;

      typedef __gnu_debug::_Safe_iterator<_Base_iterator,

                                          unordered_map> iterator;

      typedef __gnu_debug::_Safe_iterator<_Base_const_iterator,

                                          unordered_map> const_iterator;

      typedef __gnu_debug::_Safe_local_iterator<_Base_local_iterator,

                                          unordered_map> local_iterator;

      typedef __gnu_debug::_Safe_local_iterator<_Base_const_local_iterator,

                                          unordered_map> const_local_iterator;

      explicit

      unordered_map(size_type __n = 10,

                    const hasher& __hf = hasher(),

                    const key_equal& __eql = key_equal(),

                    const allocator_type& __a = allocator_type())

      : _Base(__n, __hf, __eql, __a) { }

      template

        unordered_map(_InputIterator __first, _InputIterator __last,

                      size_type __n = 0,

                      const hasher& __hf = hasher(),

                      const key_equal& __eql = key_equal(),

                      const allocator_type& __a = allocator_type())

        : _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,

                                                                     __last)),

                __gnu_debug::__base(__last), __n,

                __hf, __eql, __a) { }

      unordered_map(const unordered_map& __x)

      : _Base(__x) { }

      unordered_map(const _Base& __x)

      : _Base(__x) { }

      unordered_map(unordered_map&& __x)

      : _Base(std::move(__x)) { }

      unordered_map(initializer_list __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_map() noexcept { }

      unordered_map&

      operator=(const unordered_map& __x)

      {

        *static_cast<_Base*>(this) = __x;

        this->_M_invalidate_all();

        return *this;

      }

      unordered_map&

      operator=(unordered_map&& __x)

      {

        // NB: DR 1204.

        // NB: DR 675.

        __glibcxx_check_self_move_assign(__x);

        clear();

        swap(__x);

        return *this;

      }

      unordered_map&

      operator=(initializer_list __l)

      {

        this->clear();

        this->insert(__l);

        return *this;

      }

      void

      swap(unordered_map& __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

        std::pair

        emplace(_Args&&... __args)

        {

          size_type __bucket_count = this->bucket_count();

          std::pair<_Base_iterator, bool> __res

            = _Base::emplace(std::forward<_Args>(__args)...);

          _M_check_rehashed(__bucket_count);

          return std::make_pair(iterator(__res.first, this), __res.second);

        }

      template

        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);

        }

      std::pair

      insert(const value_type& __obj)

      {

        size_type __bucket_count = this->bucket_count();

        std::pair<_Base_iterator, bool> __res = _Base::insert(__obj);

        _M_check_rehashed(__bucket_count);

        return std::make_pair(iterator(__res.first, this), __res.second);

      }

      iterator

      insert(const_iterator __hint, const value_type& __obj)

      {

        __glibcxx_check_insert(__hint);

        size_type __bucket_count = this->bucket_count();

        _Base_iterator __it = _Base::insert(__hint.base(), __obj);

        _M_check_rehashed(__bucket_count);

        return iterator(__it, this);

      }

      template

               std::enable_if

                                                    _Pair&&>::value>::type>

        std::pair

        insert(_Pair&& __obj)

        {

          size_type __bucket_count = this->bucket_count();

          std::pair<_Base_iterator, bool> __res =

            _Base::insert(std::forward<_Pair>(__obj));

          _M_check_rehashed(__bucket_count);

          return std::make_pair(iterator(__res.first, this), __res.second);

        }

      template

               std::enable_if

                                                    _Pair&&>::value>::type>

        iterator

        insert(const_iterator __hint, _Pair&& __obj)

        {

          __glibcxx_check_insert(__hint);

          size_type __bucket_count = this->bucket_count();

          _Base_iterator __it =

            _Base::insert(__hint.base(), std::forward<_Pair>(__obj));

          _M_check_rehashed(__bucket_count);

          return iterator(__it, this);

        }

      void

      insert(std::initializer_list __l)

      {

        size_type __bucket_count = this->bucket_count();

        _Base::insert(__l);

        _M_check_rehashed(__bucket_count);

      }

      template

        void

        insert(_InputIterator __first, _InputIterator __last)

        {

          __glibcxx_check_valid_range(__first, __last);

          size_type __bucket_count = this->bucket_count();

          _Base::insert(__gnu_debug::__base(__first),

                        __gnu_debug::__base(__last));

          _M_check_rehashed(__bucket_count);

        }

      iterator

      find(const key_type& __key)

      { return iterator(_Base::find(__key), this); }

      const_iterator

      find(const key_type& __key) const

      { return const_iterator(_Base::find(__key), this); }

      std::pair

      equal_range(const key_type& __key)

      {

        std::pair<_Base_iterator, _Base_iterator> __res =

          _Base::equal_range(__key);

        return std::make_pair(iterator(__res.first, this),

                              iterator(__res.second, this));

      }

      std::pair

      equal_range(const key_type& __key) const

      {

        std::pair<_Base_const_iterator, _Base_const_iterator> __res =

          _Base::equal_range(__key);

        return std::make_pair(const_iterator(__res.first, this),

                              const_iterator(__res.second, this));

      }

      size_type

      erase(const key_type& __key)

      {

        size_type __ret(0);

        _Base_iterator __victim(_Base::find(__key));

        if (__victim != _Base::end())

          {

            this->_M_invalidate_if([__victim](_Base_const_iterator __it)

                            { return __it == __victim; });

            _Base_local_iterator __local_victim = _S_to_local(__victim);

            this->_M_invalidate_local_if(

                            [__local_victim](_Base_const_local_iterator __it)

                            { return __it == __local_victim; });

            size_type __bucket_count = this->bucket_count();

            _Base::erase(__victim);

            _M_check_rehashed(__bucket_count);

            __ret = 1;

          }

        return __ret;

      }

      iterator

      erase(const_iterator __it)

      {

        __glibcxx_check_erase(__it);

        _Base_const_iterator __victim = __it.base();

        this->_M_invalidate_if([__victim](_Base_const_iterator __it)

                        { return __it == __victim; });

        _Base_const_local_iterator __local_victim = _S_to_local(__victim);

        this->_M_invalidate_local_if(

                        [__local_victim](_Base_const_local_iterator __it)

                        { return __it == __local_victim; });

        size_type __bucket_count = this->bucket_count();

        _Base_iterator __next = _Base::erase(__it.base());

        _M_check_rehashed(__bucket_count);

        return iterator(__next, this);

      }

      iterator

      erase(iterator __it)

      { return erase(const_iterator(__it)); }

      iterator

      erase(const_iterator __first, const_iterator __last)

      {

        __glibcxx_check_erase_range(__first, __last);

        for (_Base_const_iterator __tmp = __first.base();

             __tmp != __last.base(); ++__tmp)

          {

            _GLIBCXX_DEBUG_VERIFY(__tmp != _Base::end(),

                                  _M_message(__gnu_debug::__msg_valid_range)

                                  ._M_iterator(__first, "first")

                                  ._M_iterator(__last, "last"));

            this->_M_invalidate_if([__tmp](_Base_const_iterator __it)

                            { return __it == __tmp; });

            _Base_const_local_iterator __local_tmp = _S_to_local(__tmp);

            this->_M_invalidate_local_if(

                            [__local_tmp](_Base_const_local_iterator __it)

                            { return __it == __local_tmp; });

          }

        size_type __bucket_count = this->bucket_count();

        _Base_iterator __next = _Base::erase(__first.base(), __last.base());

        _M_check_rehashed(__bucket_count);

        return iterator(__next, this);

      }

      _Base&

      _M_base() noexcept       { return *this; }

      const _Base&

      _M_base() const noexcept { return *this; }

    private:

      void

      _M_invalidate_locals()

      {

        _Base_local_iterator __local_end = _Base::end(0);

        this->_M_invalidate_local_if(

                        [__local_end](_Base_const_local_iterator __it)

                        { return __it != __local_end; });

      }

      void

      _M_invalidate_all()

      {

        _Base_iterator __end = _Base::end();

        this->_M_invalidate_if([__end](_Base_const_iterator __it)

                        { return __it != __end; });

        _M_invalidate_locals();

      }

      void

      _M_check_rehashed(size_type __prev_count)

      {

        if (__prev_count != this->bucket_count())

          _M_invalidate_locals();

      }

      static _Base_local_iterator

      _S_to_local(_Base_iterator __it)

      {

        // The returned local iterator will not be incremented so we don't

        // need to compute __it's node bucket

        return _Base_local_iterator(__it._M_cur, 0, 0);

      }

      static _Base_const_local_iterator

      _S_to_local(_Base_const_iterator __it)

      {

        // The returned local iterator will not be incremented so we don't

        // need to compute __it's node bucket

        return _Base_const_local_iterator(__it._M_cur, 0, 0);

      }

    };

  template

           typename _Pred, typename _Alloc>

    inline void

    swap(unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,

         unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)

    { __x.swap(__y); }

  template

           typename _Pred, typename _Alloc>

    inline bool

    operator==(const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,

               const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)

    { return __x._M_base() == __y._M_base(); }

  template

           typename _Pred, typename _Alloc>

    inline bool

    operator!=(const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,

               const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)

    { return !(__x == __y); }

  /// Class std::unordered_multimap with safety/checking/debug instrumentation.

  template

           typename _Hash = std::hash<_Key>,

           typename _Pred = std::equal_to<_Key>,

           typename _Alloc = std::allocator<_Key> >

    class unordered_multimap

    : public _GLIBCXX_STD_C::unordered_multimap<_Key, _Tp, _Hash,

                                                _Pred, _Alloc>,

      public __gnu_debug::_Safe_unordered_container

                                                _Tp, _Hash, _Pred, _Alloc> >

    {

      typedef _GLIBCXX_STD_C::unordered_multimap<_Key, _Tp, _Hash,

                                                 _Pred, _Alloc> _Base;

      typedef __gnu_debug::_Safe_unordered_container

        _Safe_base;

      typedef typename _Base::const_iterator _Base_const_iterator;

      typedef typename _Base::iterator _Base_iterator;

      typedef typename _Base::const_local_iterator _Base_const_local_iterator;

      typedef typename _Base::local_iterator _Base_local_iterator;

    public:

      typedef typename _Base::size_type       size_type;

      typedef typename _Base::hasher          hasher;

      typedef typename _Base::key_equal       key_equal;

      typedef typename _Base::allocator_type  allocator_type;

      typedef typename _Base::key_type        key_type;

      typedef typename _Base::value_type      value_type;

      typedef __gnu_debug::_Safe_iterator<_Base_iterator,

                                          unordered_multimap> iterator;

      typedef __gnu_debug::_Safe_iterator<_Base_const_iterator,

                                          unordered_multimap> const_iterator;

      typedef __gnu_debug::_Safe_local_iterator<

        _Base_local_iterator, unordered_multimap> local_iterator;

      typedef __gnu_debug::_Safe_local_iterator<

        _Base_const_local_iterator, unordered_multimap> const_local_iterator;

      explicit

      unordered_multimap(size_type __n = 10,

                         const hasher& __hf = hasher(),

                         const key_equal& __eql = key_equal(),

                         const allocator_type& __a = allocator_type())

      : _Base(__n, __hf, __eql, __a) { }

      template

        unordered_multimap(_InputIterator __first, _InputIterator __last,

                           size_type __n = 0,

                           const hasher& __hf = hasher(),

                           const key_equal& __eql = key_equal(),

                           const allocator_type& __a = allocator_type())

        : _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,

                                                                     __last)),

                __gnu_debug::__base(__last), __n,

                __hf, __eql, __a) { }

      unordered_multimap(const unordered_multimap& __x)

      : _Base(__x) { }

      unordered_multimap(const _Base& __x)

      : _Base(__x) { }

      unordered_multimap(unordered_multimap&& __x)

      : _Base(std::move(__x)) { }

      unordered_multimap(initializer_list __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 __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

        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

        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();

        _Base_iterator __it = _Base::insert(__obj);

        _M_check_rehashed(__bucket_count);

        return iterator(__it, this);

      }

      iterator

      insert(const_iterator __hint, const value_type& __obj)

      {

        __glibcxx_check_insert(__hint);

        size_type __bucket_count = this->bucket_count();

        _Base_iterator __it = _Base::insert(__hint.base(), __obj);

        _M_check_rehashed(__bucket_count);

        return iterator(__it, this);

      }

      template

               std::enable_if

                                                    _Pair&&>::value>::type>

        iterator

        insert(_Pair&& __obj)

        {

          size_type __bucket_count = this->bucket_count();

          _Base_iterator __it = _Base::insert(std::forward<_Pair>(__obj));

          _M_check_rehashed(__bucket_count);

          return iterator(__it, this);

        }

      template

               std::enable_if

                                                    _Pair&&>::value>::type>

        iterator

        insert(const_iterator __hint, _Pair&& __obj)

        {

          __glibcxx_check_insert(__hint);

          size_type __bucket_count = this->bucket_count();

          _Base_iterator __it =

            _Base::insert(__hint.base(), std::forward<_Pair>(__obj));

          _M_check_rehashed(__bucket_count);

          return iterator(__it, this);

        }

      void

      insert(std::initializer_list __l)

      { _Base::insert(__l); }

      template

        void

        insert(_InputIterator __first, _InputIterator __last)

        {

          __glibcxx_check_valid_range(__first, __last);

          size_type __bucket_count = this->bucket_count();

          _Base::insert(__gnu_debug::__base(__first),

                        __gnu_debug::__base(__last));

          _M_check_rehashed(__bucket_count);

        }

      iterator

      find(const key_type& __key)

      { return iterator(_Base::find(__key), this); }

      const_iterator

      find(const key_type& __key) const

      { return const_iterator(_Base::find(__key), this); }

      std::pair

      equal_range(const key_type& __key)

      {

        std::pair<_Base_iterator, _Base_iterator> __res =

          _Base::equal_range(__key);

        return std::make_pair(iterator(__res.first, this),

                              iterator(__res.second, this));

      }

      std::pair

      equal_range(const key_type& __key) const

      {

        std::pair<_Base_const_iterator, _Base_const_iterator> __res =

          _Base::equal_range(__key);

        return std::make_pair(const_iterator(__res.first, this),

                              const_iterator(__res.second, this));

      }

      size_type

      erase(const key_type& __key)

      {

        size_type __ret(0);

        size_type __bucket_count = this->bucket_count();

        std::pair<_Base_iterator, _Base_iterator> __pair =

          _Base::equal_range(__key);

        for (_Base_iterator __victim = __pair.first; __victim != __pair.second;)

          {

            this->_M_invalidate_if([__victim](_Base_const_iterator __it)

                            { return __it == __victim; });

            _Base_local_iterator __local_victim = _S_to_local(__victim);

            this->_M_invalidate_local_if(

                            [__local_victim](_Base_const_local_iterator __it)

                            { return __it == __local_victim; });

            _Base::erase(__victim++);

            ++__ret;

          }

        _M_check_rehashed(__bucket_count);

        return __ret;

      }

      iterator

      erase(const_iterator __it)

      {

        __glibcxx_check_erase(__it);

        _Base_const_iterator __victim = __it.base();

        this->_M_invalidate_if([__victim](_Base_const_iterator __it)

                        { return __it == __victim; });

        _Base_const_local_iterator __local_victim = _S_to_local(__victim);

        this->_M_invalidate_local_if(

                        [__local_victim](_Base_const_local_iterator __it)

                        { return __it == __local_victim; });

        size_type __bucket_count = this->bucket_count();

        _Base_iterator __next = _Base::erase(__it.base());

        _M_check_rehashed(__bucket_count);

        return iterator(__next, this);

      }

      iterator

      erase(iterator __it)

      { return erase(const_iterator(__it)); }

      iterator

      erase(const_iterator __first, const_iterator __last)

      {

        __glibcxx_check_erase_range(__first, __last);

        for (_Base_const_iterator __tmp = __first.base();

             __tmp != __last.base(); ++__tmp)

          {

            _GLIBCXX_DEBUG_VERIFY(__tmp != _Base::end(),

                                  _M_message(__gnu_debug::__msg_valid_range)

                                  ._M_iterator(__first, "first")

                                  ._M_iterator(__last, "last"));

            this->_M_invalidate_if([__tmp](_Base_const_iterator __it)

                            { return __it == __tmp; });

            _Base_const_local_iterator __local_tmp = _S_to_local(__tmp);

            this->_M_invalidate_local_if(

                            [__local_tmp](_Base_const_local_iterator __it)

                            { return __it == __local_tmp; });

          }

        size_type __bucket_count = this->bucket_count();

        _Base_iterator __next = _Base::erase(__first.base(), __last.base());

        _M_check_rehashed(__bucket_count);

        return iterator(__next, this);

      }

      _Base&

      _M_base() noexcept       { return *this; }

      const _Base&

      _M_base() const noexcept { return *this; }

    private:

      void

      _M_invalidate_locals()

      {

        _Base_local_iterator __local_end = _Base::end(0);

        this->_M_invalidate_local_if(

                        [__local_end](_Base_const_local_iterator __it)

                        { return __it != __local_end; });

      }

      void

      _M_invalidate_all()

      {

        _Base_iterator __end = _Base::end();

        this->_M_invalidate_if([__end](_Base_const_iterator __it)

                        { return __it != __end; });

        _M_invalidate_locals();

      }

      void

      _M_check_rehashed(size_type __prev_count)

      {

        if (__prev_count != this->bucket_count())

          _M_invalidate_locals();

      }

      static _Base_local_iterator

      _S_to_local(_Base_iterator __it)

      {

        // The returned local iterator will not be incremented so we don't

        // need to compute __it's node bucket

        return _Base_local_iterator(__it._M_cur, 0, 0);

      }

      static _Base_const_local_iterator

      _S_to_local(_Base_const_iterator __it)

      {

        // The returned local iterator will not be incremented so we don't

        // need to compute __it's node bucket

        return _Base_const_local_iterator(__it._M_cur, 0, 0);

      }

    };

  template

           typename _Pred, typename _Alloc>

    inline void

    swap(unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,

         unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)

    { __x.swap(__y); }

  template

           typename _Pred, typename _Alloc>

    inline bool

    operator==(const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,

               const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)

    { return __x._M_base() == __y._M_base(); }