/*

 *

 *

 * Copyright (c) 1994

 * Hewlett-Packard Company

 *

 * Copyright (c) 1996,1997

 * Silicon Graphics Computer Systems, Inc.

 *

 * Copyright (c) 1997

 * Moscow Center for SPARC Technology

 *

 * Copyright (c) 1999

 * Boris Fomitchev

 *

 * This material is provided "as is", with absolutely no warranty expressed

 * or implied. Any use is at your own risk.

 *

 * Permission to use or copy this software for any purpose is hereby granted

 * without fee, provided the above notices are retained on all copies.

 * Permission to modify the code and to distribute modified code is granted,

 * provided the above notices are retained, and a notice that the code was

 * modified is included with the above copyright notice.

 *

 * Modified CRP 7/10/00 for improved conformance / efficiency on insert_unique /

 * insert_equal with valid hint -- efficiency is improved all around, and it is

 * should now be standard conforming for complexity on insert point immediately

 * after hint (amortized constant time).

 *

 */

#ifndef _STLP_TREE_C

#define _STLP_TREE_C

#ifndef _STLP_INTERNAL_TREE_H

#  include <stl/_tree.h>

#endif

#if defined (_STLP_DEBUG)

#  define _Rb_tree _STLP_NON_DBG_NAME(Rb_tree)

#endif

// fbp: these defines are for outline methods definitions.

// needed for definitions to be portable. Should not be used in method bodies.

#if defined (_STLP_NESTED_TYPE_PARAM_BUG)

#  define __iterator__  _Rb_tree_iterator<_Value, _STLP_HEADER_TYPENAME _Traits::_NonConstTraits>

#  define __size_type__ size_t

#  define iterator __iterator__

#else

#  define __iterator__  _STLP_TYPENAME_ON_RETURN_TYPE _Rb_tree<_Key, _Compare, _Value, _KeyOfValue, _Traits, _Alloc>::iterator

#  define __size_type__  _STLP_TYPENAME_ON_RETURN_TYPE _Rb_tree<_Key, _Compare, _Value, _KeyOfValue, _Traits, _Alloc>::size_type

#endif

_STLP_BEGIN_NAMESPACE

_STLP_MOVE_TO_PRIV_NAMESPACE

#if defined (_STLP_EXPOSE_GLOBALS_IMPLEMENTATION)

template <class _Dummy> void _STLP_CALL

_Rb_global<_Dummy>::_Rotate_left(_Rb_tree_node_base* __x,

                                 _Rb_tree_node_base*& __root) {

  _Rb_tree_node_base* __y = __x->_M_right;

  __x->_M_right = __y->_M_left;

  if (__y->_M_left != 0)

    __y->_M_left->_M_parent = __x;

  __y->_M_parent = __x->_M_parent;

  if (__x == __root)

    __root = __y;

  else if (__x == __x->_M_parent->_M_left)

    __x->_M_parent->_M_left = __y;

  else

    __x->_M_parent->_M_right = __y;

  __y->_M_left = __x;

  __x->_M_parent = __y;

}

template <class _Dummy> void _STLP_CALL

_Rb_global<_Dummy>::_Rotate_right(_Rb_tree_node_base* __x,

                                  _Rb_tree_node_base*& __root) {

  _Rb_tree_node_base* __y = __x->_M_left;

  __x->_M_left = __y->_M_right;

  if (__y->_M_right != 0)

    __y->_M_right->_M_parent = __x;

  __y->_M_parent = __x->_M_parent;

  if (__x == __root)

    __root = __y;

  else if (__x == __x->_M_parent->_M_right)

    __x->_M_parent->_M_right = __y;

  else

    __x->_M_parent->_M_left = __y;

  __y->_M_right = __x;

  __x->_M_parent = __y;

}

template <class _Dummy> void _STLP_CALL

_Rb_global<_Dummy>::_Rebalance(_Rb_tree_node_base* __x,

                               _Rb_tree_node_base*& __root) {

  __x->_M_color = _S_rb_tree_red;

  while (__x != __root && __x->_M_parent->_M_color == _S_rb_tree_red) {

    if (__x->_M_parent == __x->_M_parent->_M_parent->_M_left) {

      _Rb_tree_node_base* __y = __x->_M_parent->_M_parent->_M_right;

      if (__y && __y->_M_color == _S_rb_tree_red) {

        __x->_M_parent->_M_color = _S_rb_tree_black;

        __y->_M_color = _S_rb_tree_black;

        __x->_M_parent->_M_parent->_M_color = _S_rb_tree_red;

        __x = __x->_M_parent->_M_parent;

      }

      else {

        if (__x == __x->_M_parent->_M_right) {

          __x = __x->_M_parent;

          _Rotate_left(__x, __root);

        }

        __x->_M_parent->_M_color = _S_rb_tree_black;

        __x->_M_parent->_M_parent->_M_color = _S_rb_tree_red;

        _Rotate_right(__x->_M_parent->_M_parent, __root);

      }

    }

    else {

      _Rb_tree_node_base* __y = __x->_M_parent->_M_parent->_M_left;

      if (__y && __y->_M_color == _S_rb_tree_red) {

        __x->_M_parent->_M_color = _S_rb_tree_black;

        __y->_M_color = _S_rb_tree_black;

        __x->_M_parent->_M_parent->_M_color = _S_rb_tree_red;

        __x = __x->_M_parent->_M_parent;

      }

      else {

        if (__x == __x->_M_parent->_M_left) {

          __x = __x->_M_parent;

          _Rotate_right(__x, __root);

        }

        __x->_M_parent->_M_color = _S_rb_tree_black;

        __x->_M_parent->_M_parent->_M_color = _S_rb_tree_red;

        _Rotate_left(__x->_M_parent->_M_parent, __root);

      }

    }

  }

  __root->_M_color = _S_rb_tree_black;

}

template <class _Dummy> _Rb_tree_node_base* _STLP_CALL

_Rb_global<_Dummy>::_Rebalance_for_erase(_Rb_tree_node_base* __z,

                                         _Rb_tree_node_base*& __root,

                                         _Rb_tree_node_base*& __leftmost,

                                         _Rb_tree_node_base*& __rightmost) {

  _Rb_tree_node_base* __y = __z;

  _Rb_tree_node_base* __x;

  _Rb_tree_node_base* __x_parent;

  if (__y->_M_left == 0)     // __z has at most one non-null child. y == z.

    __x = __y->_M_right;     // __x might be null.

  else {

    if (__y->_M_right == 0)  // __z has exactly one non-null child. y == z.

      __x = __y->_M_left;    // __x is not null.

    else {                   // __z has two non-null children.  Set __y to

      __y = _Rb_tree_node_base::_S_minimum(__y->_M_right);   //   __z's successor.  __x might be null.

      __x = __y->_M_right;

    }

  }

  if (__y != __z) {          // relink y in place of z.  y is z's successor

    __z->_M_left->_M_parent = __y;

    __y->_M_left = __z->_M_left;

    if (__y != __z->_M_right) {

      __x_parent = __y->_M_parent;

      if (__x) __x->_M_parent = __y->_M_parent;

      __y->_M_parent->_M_left = __x;      // __y must be a child of _M_left

      __y->_M_right = __z->_M_right;

      __z->_M_right->_M_parent = __y;

    }

    else

      __x_parent = __y;

    if (__root == __z)

      __root = __y;

    else if (__z->_M_parent->_M_left == __z)

      __z->_M_parent->_M_left = __y;

    else

      __z->_M_parent->_M_right = __y;

    __y->_M_parent = __z->_M_parent;

    _STLP_STD::swap(__y->_M_color, __z->_M_color);

    __y = __z;

    // __y now points to node to be actually deleted

  }

  else {                        // __y == __z

    __x_parent = __y->_M_parent;

    if (__x) __x->_M_parent = __y->_M_parent;

    if (__root == __z)

      __root = __x;

    else {

      if (__z->_M_parent->_M_left == __z)

        __z->_M_parent->_M_left = __x;

      else

        __z->_M_parent->_M_right = __x;

    }

    if (__leftmost == __z) {

      if (__z->_M_right == 0)        // __z->_M_left must be null also

        __leftmost = __z->_M_parent;

    // makes __leftmost == _M_header if __z == __root

      else

        __leftmost = _Rb_tree_node_base::_S_minimum(__x);

    }

    if (__rightmost == __z) {

      if (__z->_M_left == 0)         // __z->_M_right must be null also

        __rightmost = __z->_M_parent;

    // makes __rightmost == _M_header if __z == __root

      else                      // __x == __z->_M_left

        __rightmost = _Rb_tree_node_base::_S_maximum(__x);

    }

  }

  if (__y->_M_color != _S_rb_tree_red) {

    while (__x != __root && (__x == 0 || __x->_M_color == _S_rb_tree_black))

      if (__x == __x_parent->_M_left) {

        _Rb_tree_node_base* __w = __x_parent->_M_right;

        if (__w->_M_color == _S_rb_tree_red) {

          __w->_M_color = _S_rb_tree_black;

          __x_parent->_M_color = _S_rb_tree_red;

          _Rotate_left(__x_parent, __root);

          __w = __x_parent->_M_right;

        }

        if ((__w->_M_left == 0 ||

             __w->_M_left->_M_color == _S_rb_tree_black) && (__w->_M_right == 0 ||

             __w->_M_right->_M_color == _S_rb_tree_black)) {

          __w->_M_color = _S_rb_tree_red;

          __x = __x_parent;

          __x_parent = __x_parent->_M_parent;

        } else {

          if (__w->_M_right == 0 ||

              __w->_M_right->_M_color == _S_rb_tree_black) {

            if (__w->_M_left) __w->_M_left->_M_color = _S_rb_tree_black;

            __w->_M_color = _S_rb_tree_red;

            _Rotate_right(__w, __root);

            __w = __x_parent->_M_right;

          }

          __w->_M_color = __x_parent->_M_color;

          __x_parent->_M_color = _S_rb_tree_black;

          if (__w->_M_right) __w->_M_right->_M_color = _S_rb_tree_black;

          _Rotate_left(__x_parent, __root);

          break;

        }

      } else {                  // same as above, with _M_right <-> _M_left.

        _Rb_tree_node_base* __w = __x_parent->_M_left;

        if (__w->_M_color == _S_rb_tree_red) {

          __w->_M_color = _S_rb_tree_black;

          __x_parent->_M_color = _S_rb_tree_red;

          _Rotate_right(__x_parent, __root);

          __w = __x_parent->_M_left;

        }

        if ((__w->_M_right == 0 ||

             __w->_M_right->_M_color == _S_rb_tree_black) && (__w->_M_left == 0 ||

             __w->_M_left->_M_color == _S_rb_tree_black)) {

          __w->_M_color = _S_rb_tree_red;

          __x = __x_parent;

          __x_parent = __x_parent->_M_parent;

        } else {

          if (__w->_M_left == 0 ||

              __w->_M_left->_M_color == _S_rb_tree_black) {

            if (__w->_M_right) __w->_M_right->_M_color = _S_rb_tree_black;

            __w->_M_color = _S_rb_tree_red;

            _Rotate_left(__w, __root);

            __w = __x_parent->_M_left;

          }

          __w->_M_color = __x_parent->_M_color;

          __x_parent->_M_color = _S_rb_tree_black;

          if (__w->_M_left) __w->_M_left->_M_color = _S_rb_tree_black;

          _Rotate_right(__x_parent, __root);

          break;

        }

      }

    if (__x) __x->_M_color = _S_rb_tree_black;

  }

  return __y;

}

template <class _Dummy> _Rb_tree_node_base* _STLP_CALL

_Rb_global<_Dummy>::_M_decrement(_Rb_tree_node_base* _M_node) {

  if (_M_node->_M_color == _S_rb_tree_red && _M_node->_M_parent->_M_parent == _M_node)

    _M_node = _M_node->_M_right;

  else if (_M_node->_M_left != 0) {

    _M_node = _Rb_tree_node_base::_S_maximum(_M_node->_M_left);

  }

  else {

    _Base_ptr __y = _M_node->_M_parent;

    while (_M_node == __y->_M_left) {

      _M_node = __y;

      __y = __y->_M_parent;

    }

    _M_node = __y;

  }

  return _M_node;

}

template <class _Dummy> _Rb_tree_node_base* _STLP_CALL

_Rb_global<_Dummy>::_M_increment(_Rb_tree_node_base* _M_node) {

  if (_M_node->_M_right != 0) {

    _M_node = _Rb_tree_node_base::_S_minimum(_M_node->_M_right);

  }

  else {

    _Base_ptr __y = _M_node->_M_parent;

    while (_M_node == __y->_M_right) {

      _M_node = __y;

      __y = __y->_M_parent;

    }

    // check special case: This is necessary if _M_node is the

    // _M_head and the tree contains only a single node __y. In

    // that case parent, left and right all point to __y!

    if (_M_node->_M_right != __y)

      _M_node = __y;

  }

  return _M_node;

}

#endif /* _STLP_EXPOSE_GLOBALS_IMPLEMENTATION */

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc>&

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc> ::operator=(

  const _Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc>& __x) {

  if (this != &__x) {

    // Note that _Key may be a constant type.

    clear();

    _M_node_count = 0;

    _M_key_compare = __x._M_key_compare;

    if (__x._M_root() == 0) {

      _M_root() = 0;

      _M_leftmost() = &this->_M_header._M_data;

      _M_rightmost() = &this->_M_header._M_data;

    }

    else {

      _M_root() = _M_copy(__x._M_root(), &this->_M_header._M_data);

      _M_leftmost() = _S_minimum(_M_root());

      _M_rightmost() = _S_maximum(_M_root());

      _M_node_count = __x._M_node_count;

    }

  }

  return *this;

}

// CRP 7/10/00 inserted argument __on_right, which is another hint (meant to

// act like __on_left and ignore a portion of the if conditions -- specify

// __on_right != 0 to bypass comparison as false or __on_left != 0 to bypass

// comparison as true)

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

__iterator__

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc> ::_M_insert(_Rb_tree_node_base * __parent,

                                                                      const _Value& __val,

                                                                      _Rb_tree_node_base * __on_left,

                                                                      _Rb_tree_node_base * __on_right) {

  // We do not create the node here as, depending on tests, we might call

  // _M_key_compare that can throw an exception.

  _Base_ptr __new_node;

  if ( __parent == &this->_M_header._M_data ) {

    __new_node = _M_create_node(__val);

    _S_left(__parent) = __new_node;   // also makes _M_leftmost() = __new_node

    _M_root() = __new_node;

    _M_rightmost() = __new_node;

  }

  else if ( __on_right == 0 &&     // If __on_right != 0, the remainder fails to false

           ( __on_left != 0 ||     // If __on_left != 0, the remainder succeeds to true

             _M_key_compare( _KeyOfValue()(__val), _S_key(__parent) ) ) ) {

    __new_node = _M_create_node(__val);

    _S_left(__parent) = __new_node;

    if (__parent == _M_leftmost())

      _M_leftmost() = __new_node;   // maintain _M_leftmost() pointing to min node

  }

  else {

    __new_node = _M_create_node(__val);

    _S_right(__parent) = __new_node;

    if (__parent == _M_rightmost())

      _M_rightmost() = __new_node;  // maintain _M_rightmost() pointing to max node

  }

  _S_parent(__new_node) = __parent;

  _Rb_global_inst::_Rebalance(__new_node, this->_M_header._M_data._M_parent);

  ++_M_node_count;

  return iterator(__new_node);

}

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

__iterator__

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc> ::insert_equal(const _Value& __val) {

  _Base_ptr __y = &this->_M_header._M_data;

  _Base_ptr __x = _M_root();

  while (__x != 0) {

    __y = __x;

    if (_M_key_compare(_KeyOfValue()(__val), _S_key(__x))) {

      __x = _S_left(__x);

    }

    else

      __x = _S_right(__x);

  }

  return _M_insert(__y, __val, __x);

}

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

pair<__iterator__, bool>

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc> ::insert_unique(const _Value& __val) {

  _Base_ptr __y = &this->_M_header._M_data;

  _Base_ptr __x = _M_root();

  bool __comp = true;

  while (__x != 0) {

    __y = __x;

    __comp = _M_key_compare(_KeyOfValue()(__val), _S_key(__x));

    __x = __comp ? _S_left(__x) : _S_right(__x);

  }

  iterator __j = iterator(__y);

  if (__comp) {

    if (__j == begin())

      return pair<iterator,bool>(_M_insert(__y, __val, /* __x*/ __y), true);

    else

      --__j;

  }

  if (_M_key_compare(_S_key(__j._M_node), _KeyOfValue()(__val))) {

    return pair<iterator,bool>(_M_insert(__y, __val, __x), true);

  }

  return pair<iterator,bool>(__j, false);

}

// Modifications CRP 7/10/00 as noted to improve conformance and

// efficiency.

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

__iterator__

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc> ::insert_unique(iterator __position,

                                                                          const _Value& __val) {

  if (__position._M_node == this->_M_header._M_data._M_left) { // begin()

    // if the container is empty, fall back on insert_unique.

    if (empty())

      return insert_unique(__val).first;

    if (_M_key_compare(_KeyOfValue()(__val), _S_key(__position._M_node))) {

      return _M_insert(__position._M_node, __val, __position._M_node);

    }

    // first argument just needs to be non-null

    else {

      bool __comp_pos_v = _M_key_compare( _S_key(__position._M_node), _KeyOfValue()(__val) );

      if (__comp_pos_v == false)  // compare > and compare < both false so compare equal

        return __position;

      //Below __comp_pos_v == true

      // Standard-conformance - does the insertion point fall immediately AFTER

      // the hint?

      iterator __after = __position;

      ++__after;

      // Check for only one member -- in that case, __position points to itself,

      // and attempting to increment will cause an infinite loop.

      if (__after._M_node == &this->_M_header._M_data)

        // Check guarantees exactly one member, so comparison was already

        // performed and we know the result; skip repeating it in _M_insert

        // by specifying a non-zero fourth argument.

        return _M_insert(__position._M_node, __val, 0, __position._M_node);

      // All other cases:

      // Optimization to catch insert-equivalent -- save comparison results,

      // and we get this for free.

      if (_M_key_compare( _KeyOfValue()(__val), _S_key(__after._M_node) )) {

        if (_S_right(__position._M_node) == 0)

          return _M_insert(__position._M_node, __val, 0, __position._M_node);

        else

          return _M_insert(__after._M_node, __val, __after._M_node);

      }

      else {

        return insert_unique(__val).first;

      }

    }

  }

  else if (__position._M_node == &this->_M_header._M_data) { // end()

    if (_M_key_compare(_S_key(_M_rightmost()), _KeyOfValue()(__val))) {

        // pass along to _M_insert that it can skip comparing

        // v, Key ; since compare Key, v was true, compare v, Key must be false.

        return _M_insert(_M_rightmost(), __val, 0, __position._M_node); // Last argument only needs to be non-null

    }

    else

      return insert_unique(__val).first;

  }

  else {

    iterator __before = __position;

    --__before;

    bool __comp_v_pos = _M_key_compare(_KeyOfValue()(__val), _S_key(__position._M_node));

    if (__comp_v_pos

        && _M_key_compare( _S_key(__before._M_node), _KeyOfValue()(__val) )) {

      if (_S_right(__before._M_node) == 0)

        return _M_insert(__before._M_node, __val, 0, __before._M_node); // Last argument only needs to be non-null

      else

        return _M_insert(__position._M_node, __val, __position._M_node);

      // first argument just needs to be non-null

    }

    else {

      // Does the insertion point fall immediately AFTER the hint?

      iterator __after = __position;

      ++__after;

      // Optimization to catch equivalent cases and avoid unnecessary comparisons

      bool __comp_pos_v = !__comp_v_pos;  // Stored this result earlier

      // If the earlier comparison was true, this comparison doesn't need to be

      // performed because it must be false.  However, if the earlier comparison

      // was false, we need to perform this one because in the equal case, both will

      // be false.

      if (!__comp_v_pos) {

        __comp_pos_v = _M_key_compare(_S_key(__position._M_node), _KeyOfValue()(__val));

      }

      if ( (!__comp_v_pos) // comp_v_pos true implies comp_v_pos false

          && __comp_pos_v

          && (__after._M_node == &this->_M_header._M_data ||

              _M_key_compare( _KeyOfValue()(__val), _S_key(__after._M_node) ))) {

        if (_S_right(__position._M_node) == 0)

          return _M_insert(__position._M_node, __val, 0, __position._M_node);

        else

          return _M_insert(__after._M_node, __val, __after._M_node);

      } else {

        // Test for equivalent case

        if (__comp_v_pos == __comp_pos_v)

          return __position;

        else

          return insert_unique(__val).first;

      }

    }

  }

}

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

__iterator__

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc> ::insert_equal(iterator __position,

                                                                         const _Value& __val) {

  if (__position._M_node == this->_M_header._M_data._M_left) { // begin()

    // Check for zero members

    if (size() <= 0)

        return insert_equal(__val);

    if (!_M_key_compare(_S_key(__position._M_node), _KeyOfValue()(__val)))

      return _M_insert(__position._M_node, __val, __position._M_node);

    else {

      // Check for only one member

      if (__position._M_node->_M_left == __position._M_node)

        // Unlike insert_unique, can't avoid doing a comparison here.

        return _M_insert(__position._M_node, __val);

      // All other cases:

      // Standard-conformance - does the insertion point fall immediately AFTER

      // the hint?

      iterator __after = __position;

      ++__after;

      // Already know that compare(pos, v) must be true!

      // Therefore, we want to know if compare(after, v) is false.

      // (i.e., we now pos < v, now we want to know if v <= after)

      // If not, invalid hint.

      if ( __after._M_node == &this->_M_header._M_data ||

           !_M_key_compare( _S_key(__after._M_node), _KeyOfValue()(__val) ) ) {

        if (_S_right(__position._M_node) == 0)

          return _M_insert(__position._M_node, __val, 0, __position._M_node);

        else

          return _M_insert(__after._M_node, __val, __after._M_node);

      }

      else { // Invalid hint

        return insert_equal(__val);

      }

    }

  }

  else if (__position._M_node == &this->_M_header._M_data) { // end()

    if (!_M_key_compare(_KeyOfValue()(__val), _S_key(_M_rightmost())))

      return _M_insert(_M_rightmost(), __val, 0, __position._M_node); // Last argument only needs to be non-null

    else {

      return insert_equal(__val);

    }

  }

  else {

    iterator __before = __position;

    --__before;

    // store the result of the comparison between pos and v so

    // that we don't have to do it again later.  Note that this reverses the shortcut

    // on the if, possibly harming efficiency in comparisons; I think the harm will

    // be negligible, and to do what I want to do (save the result of a comparison so

    // that it can be re-used) there is no alternative.  Test here is for before <= v <= pos.

    bool __comp_pos_v = _M_key_compare(_S_key(__position._M_node), _KeyOfValue()(__val));

    if (!__comp_pos_v &&

        !_M_key_compare(_KeyOfValue()(__val), _S_key(__before._M_node))) {

      if (_S_right(__before._M_node) == 0)

        return _M_insert(__before._M_node, __val, 0, __before._M_node); // Last argument only needs to be non-null

      else

        return _M_insert(__position._M_node, __val, __position._M_node);

    }

    else {

      // Does the insertion point fall immediately AFTER the hint?

      // Test for pos < v <= after

      iterator __after = __position;

      ++__after;

      if (__comp_pos_v &&

          ( __after._M_node == &this->_M_header._M_data ||

            !_M_key_compare( _S_key(__after._M_node), _KeyOfValue()(__val) ) ) ) {

        if (_S_right(__position._M_node) == 0)

          return _M_insert(__position._M_node, __val, 0, __position._M_node);

        else

          return _M_insert(__after._M_node, __val, __after._M_node);

      }

      else { // Invalid hint

        return insert_equal(__val);

      }

    }

  }

}

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

_Rb_tree_node_base*

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc> ::_M_copy(_Rb_tree_node_base* __x,

                                                                    _Rb_tree_node_base* __p) {

  // structural copy.  __x and __p must be non-null.

  _Base_ptr __top = _M_clone_node(__x);

  _S_parent(__top) = __p;

  _STLP_TRY {

    if (_S_right(__x))

      _S_right(__top) = _M_copy(_S_right(__x), __top);

    __p = __top;

    __x = _S_left(__x);

    while (__x != 0) {

      _Base_ptr __y = _M_clone_node(__x);

      _S_left(__p) = __y;

      _S_parent(__y) = __p;

      if (_S_right(__x))

        _S_right(__y) = _M_copy(_S_right(__x), __y);

      __p = __y;

      __x = _S_left(__x);

    }

  }

  _STLP_UNWIND(_M_erase(__top))

  return __top;

}

// this has to stay out-of-line : it's recursive

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

void

_Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc>::_M_erase(_Rb_tree_node_base *__x) {

  // erase without rebalancing

  while (__x != 0) {

    _M_erase(_S_right(__x));

    _Base_ptr __y = _S_left(__x);

    _STLP_STD::_Destroy(&_S_value(__x));

    this->_M_header.deallocate(__STATIC_CAST(_Link_type, __x),1);

    __x = __y;

  }

}

#if defined (_STLP_DEBUG)

inline int

__black_count(_Rb_tree_node_base* __node, _Rb_tree_node_base* __root) {

  if (__node == 0)

    return 0;

  else {

    int __bc = __node->_M_color == _S_rb_tree_black ? 1 : 0;

    if (__node == __root)

      return __bc;

    else

      return __bc + __black_count(__node->_M_parent, __root);

  }

}

template <class _Key, class _Compare,

          class _Value, class _KeyOfValue, class _Traits, class _Alloc>

bool _Rb_tree<_Key,_Compare,_Value,_KeyOfValue,_Traits,_Alloc>::__rb_verify() const {

  if (_M_node_count == 0 || begin() == end())

    return ((_M_node_count == 0) &&

            (begin() == end()) &&

            (this->_M_header._M_data._M_left == &this->_M_header._M_data) &&

            (this->_M_header._M_data._M_right == &this->_M_header._M_data));

  int __len = __black_count(_M_leftmost(), _M_root());

  for (const_iterator __it = begin(); __it != end(); ++__it) {

    _Base_ptr __x = __it._M_node;

    _Base_ptr __L = _S_left(__x);

    _Base_ptr __R = _S_right(__x);

    if (__x->_M_color == _S_rb_tree_red)

      if ((__L && __L->_M_color == _S_rb_tree_red) ||

          (__R && __R->_M_color == _S_rb_tree_red))

        return false;

    if (__L && _M_key_compare(_S_key(__x), _S_key(__L)))

      return false;

    if (__R && _M_key_compare(_S_key(__R), _S_key(__x)))

      return false;

    if (!__L && !__R && __black_count(__x, _M_root()) != __len)

      return false;

  }

  if (_M_leftmost() != _Rb_tree_node_base::_S_minimum(_M_root()))

    return false;

  if (_M_rightmost() != _Rb_tree_node_base::_S_maximum(_M_root()))

    return false;

  return true;

}

#endif /* _STLP_DEBUG */

_STLP_MOVE_TO_STD_NAMESPACE

_STLP_END_NAMESPACE

#undef _Rb_tree

#undef __iterator__

#undef iterator

#undef __size_type__

#endif /*  _STLP_TREE_C */

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