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gcc/libstdc++-v3/include/bits/stl_tree.h
Gawain Bolton f92c5313e1 stl_tree.h: _Rb_tree_rebalance(): Add local variable for grandparent and use const 
2003-07-05  Gawain Bolton  <gp.bolton@computer.org>

	* include/bits/stl_tree.h: _Rb_tree_rebalance():  Add local
          variable for grandparent and use const

From-SVN: r68977
2003-07-05 15:47:09 +00:00

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// RB tree implementation -*- C++ -*-
// Copyright (C) 2001, 2002, 2003 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 2, 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/*
*
* Copyright (c) 1996,1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
*/
/** @file stl_tree.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#ifndef _TREE_H
#define _TREE_H 1
/*
Red-black tree class, designed for use in implementing STL
associative containers (set, multiset, map, and multimap). The
insertion and deletion algorithms are based on those in Cormen,
Leiserson, and Rivest, Introduction to Algorithms (MIT Press, 1990),
except that
(1) the header cell is maintained with links not only to the root
but also to the leftmost node of the tree, to enable constant time
begin(), and to the rightmost node of the tree, to enable linear time
performance when used with the generic set algorithms (set_union,
etc.);
(2) when a node being deleted has two children its successor node is
relinked into its place, rather than copied, so that the only
iterators invalidated are those referring to the deleted node.
*/
#include <bits/stl_algobase.h>
#include <bits/allocator.h>
#include <bits/stl_construct.h>
#include <bits/stl_function.h>
namespace std
{
enum _Rb_tree_color { _S_red = false, _S_black = true };
struct _Rb_tree_node_base
{
typedef _Rb_tree_node_base* _Base_ptr;
_Rb_tree_color _M_color;
_Base_ptr _M_parent;
_Base_ptr _M_left;
_Base_ptr _M_right;
static _Base_ptr
_S_minimum(_Base_ptr __x)
{
while (__x->_M_left != 0) __x = __x->_M_left;
return __x;
}
static _Base_ptr
_S_maximum(_Base_ptr __x)
{
while (__x->_M_right != 0) __x = __x->_M_right;
return __x;
}
};
template<typename _Val>
struct _Rb_tree_node : public _Rb_tree_node_base
{
typedef _Rb_tree_node<_Val>* _Link_type;
_Val _M_value_field;
};
struct _Rb_tree_base_iterator
{
typedef _Rb_tree_node_base::_Base_ptr _Base_ptr;
typedef bidirectional_iterator_tag iterator_category;
typedef ptrdiff_t difference_type;
_Base_ptr _M_node;
void
_M_increment()
{
if (_M_node->_M_right != 0)
{
_M_node = _M_node->_M_right;
while (_M_node->_M_left != 0)
_M_node = _M_node->_M_left;
}
else
{
_Base_ptr __y = _M_node->_M_parent;
while (_M_node == __y->_M_right)
{
_M_node = __y;
__y = __y->_M_parent;
}
if (_M_node->_M_right != __y)
_M_node = __y;
}
}
void
_M_decrement()
{
if (_M_node->_M_color == _S_red
&& _M_node->_M_parent->_M_parent == _M_node)
_M_node = _M_node->_M_right;
else if (_M_node->_M_left != 0)
{
_Base_ptr __y = _M_node->_M_left;
while (__y->_M_right != 0)
__y = __y->_M_right;
_M_node = __y;
}
else
{
_Base_ptr __y = _M_node->_M_parent;
while (_M_node == __y->_M_left)
{
_M_node = __y;
__y = __y->_M_parent;
}
_M_node = __y;
}
}
};
template<typename _Val, typename _Ref, typename _Ptr>
struct _Rb_tree_iterator : public _Rb_tree_base_iterator
{
typedef _Val value_type;
typedef _Ref reference;
typedef _Ptr pointer;
typedef _Rb_tree_iterator<_Val, _Val&, _Val*> iterator;
typedef _Rb_tree_iterator<_Val, const _Val&, const _Val*>
const_iterator;
typedef _Rb_tree_iterator<_Val, _Ref, _Ptr> _Self;
typedef _Rb_tree_node<_Val>* _Link_type;
_Rb_tree_iterator() {}
_Rb_tree_iterator(_Rb_tree_node_base* __x) { _M_node = __x; }
_Rb_tree_iterator(const iterator& __it) { _M_node = __it._M_node; }
reference
operator*() const { return _Link_type(_M_node)->_M_value_field; }
pointer
operator->() const { return &(operator*()); }
_Self&
operator++()
{
_M_increment();
return *this;
}
_Self
operator++(int)
{
_Self __tmp = *this;
_M_increment();
return __tmp;
}
_Self&
operator--() { _M_decrement(); return *this; }
_Self
operator--(int)
{
_Self __tmp = *this;
_M_decrement();
return __tmp;
}
};
template<typename _Val, typename _Ref, typename _Ptr>
inline bool
operator==(const _Rb_tree_iterator<_Val, _Ref, _Ptr>& __x,
const _Rb_tree_iterator<_Val, _Ref, _Ptr>& __y)
{ return __x._M_node == __y._M_node; }
template<typename _Val>
inline bool
operator==(const _Rb_tree_iterator<_Val, const _Val&, const _Val*>& __x,
const _Rb_tree_iterator<_Val, _Val&, _Val*>& __y)
{ return __x._M_node == __y._M_node; }
template<typename _Val>
inline bool
operator==(const _Rb_tree_iterator<_Val, _Val&, _Val*>& __x,
const _Rb_tree_iterator<_Val, const _Val&, const _Val*>& __y)
{ return __x._M_node == __y._M_node; }
template<typename _Val, typename _Ref, typename _Ptr>
inline bool
operator!=(const _Rb_tree_iterator<_Val, _Ref, _Ptr>& __x,
const _Rb_tree_iterator<_Val, _Ref, _Ptr>& __y)
{ return __x._M_node != __y._M_node; }
template<typename _Val>
inline bool
operator!=(const _Rb_tree_iterator<_Val, const _Val&, const _Val*>& __x,
const _Rb_tree_iterator<_Val, _Val&, _Val*>& __y)
{ return __x._M_node != __y._M_node; }
template<typename _Val>
inline bool
operator!=(const _Rb_tree_iterator<_Val, _Val&, _Val*>& __x,
const _Rb_tree_iterator<_Val, const _Val&, const _Val*>& __y)
{ return __x._M_node != __y._M_node; }
inline void
_Rb_tree_rotate_left(_Rb_tree_node_base* const __x, _Rb_tree_node_base*& __root)
{
_Rb_tree_node_base* const __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;
}
inline void
_Rb_tree_rotate_right(_Rb_tree_node_base* const __x, _Rb_tree_node_base*& __root)
{
_Rb_tree_node_base* const __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;
}
inline void
_Rb_tree_rebalance(_Rb_tree_node_base* __x, _Rb_tree_node_base*& __root)
{
__x->_M_color = _S_red;
while (__x != __root
&& __x->_M_parent->_M_color == _S_red)
{
_Rb_tree_node_base* const __xpp = __x->_M_parent->_M_parent;
if (__x->_M_parent == __xpp->_M_left)
{
_Rb_tree_node_base* const __y = __xpp->_M_right;
if (__y && __y->_M_color == _S_red)
{
__x->_M_parent->_M_color = _S_black;
__y->_M_color = _S_black;
__xpp->_M_color = _S_red;
__x = __xpp;
}
else
{
if (__x == __x->_M_parent->_M_right)
{
__x = __x->_M_parent;
_Rb_tree_rotate_left(__x, __root);
}
__x->_M_parent->_M_color = _S_black;
__xpp->_M_color = _S_red;
_Rb_tree_rotate_right(__xpp, __root);
}
}
else
{
_Rb_tree_node_base* const __y = __xpp->_M_left;
if (__y && __y->_M_color == _S_red)
{
__x->_M_parent->_M_color = _S_black;
__y->_M_color = _S_black;
__xpp->_M_color = _S_red;
__x = __xpp;
}
else
{
if (__x == __x->_M_parent->_M_left)
{
__x = __x->_M_parent;
_Rb_tree_rotate_right(__x, __root);
}
__x->_M_parent->_M_color = _S_black;
__xpp->_M_color = _S_red;
_Rb_tree_rotate_left(__xpp, __root);
}
}
}
__root->_M_color = _S_black;
}
inline _Rb_tree_node_base*
_Rb_tree_rebalance_for_erase(_Rb_tree_node_base* const __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 = 0;
_Rb_tree_node_base* __x_parent = 0;
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 = __y->_M_right; // __z's successor. __x might be null.
while (__y->_M_left != 0)
__y = __y->_M_left;
__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;
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_red)
{
while (__x != __root && (__x == 0 || __x->_M_color == _S_black))
if (__x == __x_parent->_M_left)
{
_Rb_tree_node_base* __w = __x_parent->_M_right;
if (__w->_M_color == _S_red)
{
__w->_M_color = _S_black;
__x_parent->_M_color = _S_red;
_Rb_tree_rotate_left(__x_parent, __root);
__w = __x_parent->_M_right;
}
if ((__w->_M_left == 0 ||
__w->_M_left->_M_color == _S_black) &&
(__w->_M_right == 0 ||
__w->_M_right->_M_color == _S_black))
{
__w->_M_color = _S_red;
__x = __x_parent;
__x_parent = __x_parent->_M_parent;
}
else
{
if (__w->_M_right == 0
|| __w->_M_right->_M_color == _S_black)
{
__w->_M_left->_M_color = _S_black;
__w->_M_color = _S_red;
_Rb_tree_rotate_right(__w, __root);
__w = __x_parent->_M_right;
}
__w->_M_color = __x_parent->_M_color;
__x_parent->_M_color = _S_black;
if (__w->_M_right)
__w->_M_right->_M_color = _S_black;
_Rb_tree_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_red)
{
__w->_M_color = _S_black;
__x_parent->_M_color = _S_red;
_Rb_tree_rotate_right(__x_parent, __root);
__w = __x_parent->_M_left;
}
if ((__w->_M_right == 0 ||
__w->_M_right->_M_color == _S_black) &&
(__w->_M_left == 0 ||
__w->_M_left->_M_color == _S_black))
{
__w->_M_color = _S_red;
__x = __x_parent;
__x_parent = __x_parent->_M_parent;
}
else
{
if (__w->_M_left == 0 || __w->_M_left->_M_color == _S_black)
{
__w->_M_right->_M_color = _S_black;
__w->_M_color = _S_red;
_Rb_tree_rotate_left(__w, __root);
__w = __x_parent->_M_left;
}
__w->_M_color = __x_parent->_M_color;
__x_parent->_M_color = _S_black;
if (__w->_M_left)
__w->_M_left->_M_color = _S_black;
_Rb_tree_rotate_right(__x_parent, __root);
break;
}
}
if (__x) __x->_M_color = _S_black;
}
return __y;
}
// Base class to encapsulate the differences between old SGI-style
// allocators and standard-conforming allocators. In order to avoid
// having an empty base class, we arbitrarily move one of rb_tree's
// data members into the base class.
// _Base for general standard-conforming allocators.
template<typename _Tp, typename _Alloc, bool _S_instanceless>
class _Rb_tree_alloc_base
{
public:
typedef typename _Alloc_traits<_Tp, _Alloc>::allocator_type allocator_type;
allocator_type
get_allocator() const { return _M_node_allocator; }
_Rb_tree_alloc_base(const allocator_type& __a)
: _M_node_allocator(__a) {}
protected:
typename _Alloc_traits<_Rb_tree_node<_Tp>, _Alloc>::allocator_type
_M_node_allocator;
_Rb_tree_node_base _M_header;
_Rb_tree_node<_Tp>*
_M_get_node() { return _M_node_allocator.allocate(1); }
void
_M_put_node(_Rb_tree_node<_Tp>* __p)
{ _M_node_allocator.deallocate(__p, 1); }
};
// Specialization for instanceless allocators.
template<typename _Tp, typename _Alloc>
class _Rb_tree_alloc_base<_Tp, _Alloc, true>
{
public:
typedef typename _Alloc_traits<_Tp, _Alloc>::allocator_type allocator_type;
allocator_type get_allocator() const { return allocator_type(); }
_Rb_tree_alloc_base(const allocator_type&) {}
protected:
_Rb_tree_node_base _M_header;
typedef typename _Alloc_traits<_Rb_tree_node<_Tp>, _Alloc>::_Alloc_type
_Alloc_type;
_Rb_tree_node<_Tp>*
_M_get_node() { return _Alloc_type::allocate(1); }
void
_M_put_node(_Rb_tree_node<_Tp>* __p) { _Alloc_type::deallocate(__p, 1); }
};
template<typename _Tp, typename _Alloc>
struct _Rb_tree_base : public _Rb_tree_alloc_base<_Tp, _Alloc,
_Alloc_traits<_Tp, _Alloc>::_S_instanceless>
{
typedef _Rb_tree_alloc_base<_Tp,
_Alloc, _Alloc_traits<_Tp, _Alloc>::_S_instanceless> _Base;
typedef typename _Base::allocator_type allocator_type;
_Rb_tree_base(const allocator_type& __a)
: _Base(__a) {}
};
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc = allocator<_Val> >
class _Rb_tree : protected _Rb_tree_base<_Val, _Alloc>
{
typedef _Rb_tree_base<_Val, _Alloc> _Base;
protected:
typedef _Rb_tree_node_base* _Base_ptr;
typedef _Rb_tree_node<_Val> _Rb_tree_node;
public:
typedef _Key key_type;
typedef _Val value_type;
typedef value_type* pointer;
typedef const value_type* const_pointer;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef _Rb_tree_node* _Link_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef typename _Base::allocator_type allocator_type;
allocator_type get_allocator() const { return _Base::get_allocator(); }
protected:
using _Base::_M_get_node;
using _Base::_M_put_node;
using _Base::_M_header;
_Link_type
_M_create_node(const value_type& __x)
{
_Link_type __tmp = _M_get_node();
try
{ std::_Construct(&__tmp->_M_value_field, __x); }
catch(...)
{
_M_put_node(__tmp);
__throw_exception_again;
}
return __tmp;
}
_Link_type
_M_clone_node(_Link_type __x)
{
_Link_type __tmp = _M_create_node(__x->_M_value_field);
__tmp->_M_color = __x->_M_color;
__tmp->_M_left = 0;
__tmp->_M_right = 0;
return __tmp;
}
void
destroy_node(_Link_type __p)
{
std::_Destroy(&__p->_M_value_field);
_M_put_node(__p);
}
size_type _M_node_count; // keeps track of size of tree
_Compare _M_key_compare;
_Link_type&
_M_root() const { return (_Link_type&) this->_M_header._M_parent; }
_Link_type&
_M_leftmost() const { return (_Link_type&) this->_M_header._M_left; }
_Link_type&
_M_rightmost() const { return (_Link_type&) this->_M_header._M_right; }
_Link_type
_M_end() const { return (_Link_type) &this->_M_header; }
static _Link_type&
_S_left(_Link_type __x) { return (_Link_type&)(__x->_M_left); }
static _Link_type&
_S_right(_Link_type __x) { return (_Link_type&)(__x->_M_right); }
static _Link_type&
_S_parent(_Link_type __x) { return (_Link_type&)(__x->_M_parent); }
static reference
_S_value(_Link_type __x) { return __x->_M_value_field; }
static const _Key&
_S_key(_Link_type __x) { return _KeyOfValue()(_S_value(__x)); }
static _Link_type&
_S_left(_Base_ptr __x) { return (_Link_type&)(__x->_M_left); }
static _Link_type&
_S_right(_Base_ptr __x) { return (_Link_type&)(__x->_M_right); }
static _Link_type&
_S_parent(_Base_ptr __x) { return (_Link_type&)(__x->_M_parent); }
static reference
_S_value(_Base_ptr __x) { return ((_Link_type)__x)->_M_value_field; }
static const _Key&
_S_key(_Base_ptr __x) { return _KeyOfValue()(_S_value(_Link_type(__x)));}
static _Rb_tree_color&
_S_color(_Base_ptr __x) { return __x->_M_color; }
static _Link_type
_S_minimum(_Link_type __x)
{ return (_Link_type) _Rb_tree_node_base::_S_minimum(__x); }
static _Link_type
_S_maximum(_Link_type __x)
{ return (_Link_type) _Rb_tree_node_base::_S_maximum(__x); }
public:
typedef _Rb_tree_iterator<value_type, reference, pointer> iterator;
typedef _Rb_tree_iterator<value_type, const_reference, const_pointer>
const_iterator;
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
typedef std::reverse_iterator<iterator> reverse_iterator;
private:
iterator
_M_insert(_Base_ptr __x, _Base_ptr __y, const value_type& __v);
_Link_type
_M_copy(_Link_type __x, _Link_type __p);
void
_M_erase(_Link_type __x);
public:
// allocation/deallocation
_Rb_tree()
: _Base(allocator_type()), _M_node_count(0), _M_key_compare()
{ _M_empty_initialize(); }
_Rb_tree(const _Compare& __comp)
: _Base(allocator_type()), _M_node_count(0), _M_key_compare(__comp)
{ _M_empty_initialize(); }
_Rb_tree(const _Compare& __comp, const allocator_type& __a)
: _Base(__a), _M_node_count(0), _M_key_compare(__comp)
{ _M_empty_initialize(); }
_Rb_tree(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x)
: _Base(__x.get_allocator()), _M_node_count(0),
_M_key_compare(__x._M_key_compare)
{
if (__x._M_root() == 0)
_M_empty_initialize();
else
{
_S_color(&this->_M_header) = _S_red;
_M_root() = _M_copy(__x._M_root(), _M_end());
_M_leftmost() = _S_minimum(_M_root());
_M_rightmost() = _S_maximum(_M_root());
}
_M_node_count = __x._M_node_count;
}
~_Rb_tree() { clear(); }
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>&
operator=(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x);
private:
void _M_empty_initialize()
{
// Used to distinguish header from __root, in iterator.operator++.
_S_color(&this->_M_header) = _S_red;
_M_root() = 0;
_M_leftmost() = _M_end();
_M_rightmost() = _M_end();
}
public:
// Accessors.
_Compare
key_comp() const { return _M_key_compare; }
iterator
begin() { return _M_leftmost(); }
const_iterator
begin() const { return _M_leftmost(); }
iterator
end() { return &this->_M_header; }
const_iterator
end() const { return const_cast<_Base_ptr>(&this->_M_header); }
reverse_iterator
rbegin() { return reverse_iterator(end()); }
const_reverse_iterator
rbegin() const { return const_reverse_iterator(end()); }
reverse_iterator
rend() { return reverse_iterator(begin()); }
const_reverse_iterator
rend() const { return const_reverse_iterator(begin()); }
bool
empty() const { return _M_node_count == 0; }
size_type
size() const { return _M_node_count; }
size_type
max_size() const { return size_type(-1); }
void
swap(_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __t);
// Insert/erase.
pair<iterator,bool>
insert_unique(const value_type& __x);
iterator
insert_equal(const value_type& __x);
iterator
insert_unique(iterator __position, const value_type& __x);
iterator
insert_equal(iterator __position, const value_type& __x);
template<typename _InputIterator>
void
insert_unique(_InputIterator __first, _InputIterator __last);
template<typename _InputIterator>
void
insert_equal(_InputIterator __first, _InputIterator __last);
void
erase(iterator __position);
size_type
erase(const key_type& __x);
void
erase(iterator __first, iterator __last);
void
erase(const key_type* __first, const key_type* __last);
void
clear()
{
if (_M_node_count != 0)
{
_M_erase(_M_root());
_M_leftmost() = _M_end();
_M_root() = 0;
_M_rightmost() = _M_end();
_M_node_count = 0;
}
}
// Set operations.
iterator
find(const key_type& __x);
const_iterator
find(const key_type& __x) const;
size_type
count(const key_type& __x) const;
iterator
lower_bound(const key_type& __x);
const_iterator
lower_bound(const key_type& __x) const;
iterator
upper_bound(const key_type& __x);
const_iterator
upper_bound(const key_type& __x) const;
pair<iterator,iterator>
equal_range(const key_type& __x);
pair<const_iterator, const_iterator>
equal_range(const key_type& __x) const;
// Debugging.
bool
__rb_verify() const;
};
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline bool
operator==(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x,
const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __y)
{
return __x.size() == __y.size() &&
equal(__x.begin(), __x.end(), __y.begin());
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline bool
operator<(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x,
const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __y)
{
return lexicographical_compare(__x.begin(), __x.end(),
__y.begin(), __y.end());
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline bool
operator!=(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x,
const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __y)
{ return !(__x == __y); }
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline bool
operator>(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x,
const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __y)
{ return __y < __x; }
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline bool
operator<=(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x,
const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __y)
{ return !(__y < __x); }
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline bool
operator>=(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x,
const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __y)
{ return !(__x < __y); }
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline void
swap(_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __x,
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __y)
{ __x.swap(__y); }
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>&
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
operator=(const _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_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() = _M_end();
_M_rightmost() = _M_end();
}
else
{
_M_root() = _M_copy(__x._M_root(), _M_end());
_M_leftmost() = _S_minimum(_M_root());
_M_rightmost() = _S_maximum(_M_root());
_M_node_count = __x._M_node_count;
}
}
return *this;
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
_M_insert(_Base_ptr __x_, _Base_ptr __y_, const _Val& __v)
{
_Link_type __x = (_Link_type) __x_;
_Link_type __y = (_Link_type) __y_;
_Link_type __z;
if (__y == &this->_M_header || __x != 0 ||
_M_key_compare(_KeyOfValue()(__v), _S_key(__y)))
{
__z = _M_create_node(__v);
_S_left(__y) = __z; // also makes _M_leftmost() = __z
// when __y == &_M_header
if (__y == &this->_M_header)
{
_M_root() = __z;
_M_rightmost() = __z;
}
else if (__y == _M_leftmost())
_M_leftmost() = __z; // maintain _M_leftmost() pointing to min node
}
else
{
__z = _M_create_node(__v);
_S_right(__y) = __z;
// Maintain _M_rightmost() pointing to max node.
if (__y == _M_rightmost())
_M_rightmost() = __z;
}
_S_parent(__z) = __y;
_S_left(__z) = 0;
_S_right(__z) = 0;
_Rb_tree_rebalance(__z, this->_M_header._M_parent);
++_M_node_count;
return iterator(__z);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
insert_equal(const _Val& __v)
{
_Link_type __y = _M_end();
_Link_type __x = _M_root();
while (__x != 0)
{
__y = __x;
__x = _M_key_compare(_KeyOfValue()(__v), _S_key(__x)) ?
_S_left(__x) : _S_right(__x);
}
return _M_insert(__x, __y, __v);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
void
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
swap(_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>& __t)
{
if (_M_root() == 0)
{
if (__t._M_root() != 0)
{
_M_root() = __t._M_root();
_M_leftmost() = __t._M_leftmost();
_M_rightmost() = __t._M_rightmost();
_M_root()->_M_parent = _M_end();
__t._M_root() = 0;
__t._M_leftmost() = __t._M_end();
__t._M_rightmost() = __t._M_end();
}
}
else if (__t._M_root() == 0)
{
__t._M_root() = _M_root();
__t._M_leftmost() = _M_leftmost();
__t._M_rightmost() = _M_rightmost();
__t._M_root()->_M_parent = __t._M_end();
_M_root() = 0;
_M_leftmost() = _M_end();
_M_rightmost() = _M_end();
}
else
{
std::swap(_M_root(),__t._M_root());
std::swap(_M_leftmost(),__t._M_leftmost());
std::swap(_M_rightmost(),__t._M_rightmost());
_M_root()->_M_parent = _M_end();
__t._M_root()->_M_parent = __t._M_end();
}
// No need to swap header's color as it does not change.
std::swap(this->_M_node_count, __t._M_node_count);
std::swap(this->_M_key_compare, __t._M_key_compare);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
pair<typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator,
bool>
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
insert_unique(const _Val& __v)
{
_Link_type __y = _M_end();
_Link_type __x = _M_root();
bool __comp = true;
while (__x != 0)
{
__y = __x;
__comp = _M_key_compare(_KeyOfValue()(__v), _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(__x, __y, __v), true);
else
--__j;
if (_M_key_compare(_S_key(__j._M_node), _KeyOfValue()(__v)))
return pair<iterator,bool>(_M_insert(__x, __y, __v), true);
return pair<iterator,bool>(__j, false);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator
_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
insert_unique(iterator __position, const _Val& __v)
{
if (__position._M_node == this->_M_header._M_left)
{
// begin()
if (size() > 0 &&
_M_key_compare(_KeyOfValue()(__v), _S_key(__position._M_node)))
return _M_insert(__position._M_node, __position._M_node, __v);
// first argument just needs to be non-null
else
return insert_unique(__v).first;
}
else if (__position._M_node == &this->_M_header)
{
// end()
if (_M_key_compare(_S_key(_M_rightmost()), _KeyOfValue()(__v)))
return _M_insert(0, _M_rightmost(), __v);
else
return insert_unique(__v).first;
}
else
{
iterator __before = __position;
--__before;
if (_M_key_compare(_S_key(__before._M_node), _KeyOfValue()(__v))
&& _M_key_compare(_KeyOfValue()(__v),_S_key(__position._M_node)))
{
if (_S_right(__before._M_node) == 0)
return _M_insert(0, __before._M_node, __v);
else
return _M_insert(__position._M_node, __position._M_node, __v);
// first argument just needs to be non-null
}
else
return insert_unique(__v).first;
}
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
insert_equal(iterator __position, const _Val& __v)
{
if (__position._M_node == this->_M_header._M_left)
{
// begin()
if (size() > 0 &&
!_M_key_compare(_S_key(__position._M_node), _KeyOfValue()(__v)))
return _M_insert(__position._M_node, __position._M_node, __v);
// first argument just needs to be non-null
else
return insert_equal(__v);
}
else if (__position._M_node == &this->_M_header)
{
// end()
if (!_M_key_compare(_KeyOfValue()(__v), _S_key(_M_rightmost())))
return _M_insert(0, _M_rightmost(), __v);
else
return insert_equal(__v);
}
else
{
iterator __before = __position;
--__before;
if (!_M_key_compare(_KeyOfValue()(__v), _S_key(__before._M_node))
&& !_M_key_compare(_S_key(__position._M_node),
_KeyOfValue()(__v)))
{
if (_S_right(__before._M_node) == 0)
return _M_insert(0, __before._M_node, __v);
else
return _M_insert(__position._M_node, __position._M_node, __v);
// first argument just needs to be non-null
}
else
return insert_equal(__v);
}
}
template<typename _Key, typename _Val, typename _KoV,
typename _Cmp, typename _Alloc>
template<class _II>
void
_Rb_tree<_Key,_Val,_KoV,_Cmp,_Alloc>::
insert_equal(_II __first, _II __last)
{
for ( ; __first != __last; ++__first)
insert_equal(*__first);
}
template<typename _Key, typename _Val, typename _KoV,
typename _Cmp, typename _Alloc>
template<class _II>
void
_Rb_tree<_Key,_Val,_KoV,_Cmp,_Alloc>::
insert_unique(_II __first, _II __last)
{
for ( ; __first != __last; ++__first)
insert_unique(*__first);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline void
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::erase(iterator __position)
{
_Link_type __y =
(_Link_type) _Rb_tree_rebalance_for_erase(__position._M_node,
this->_M_header._M_parent,
this->_M_header._M_left,
this->_M_header._M_right);
destroy_node(__y);
--_M_node_count;
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::size_type
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::erase(const _Key& __x)
{
pair<iterator,iterator> __p = equal_range(__x);
size_type __n = std::distance(__p.first, __p.second);
erase(__p.first, __p.second);
return __n;
}
template<typename _Key, typename _Val, typename _KoV,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::_Link_type
_Rb_tree<_Key,_Val,_KoV,_Compare,_Alloc>::
_M_copy(_Link_type __x, _Link_type __p)
{
// Structural copy. __x and __p must be non-null.
_Link_type __top = _M_clone_node(__x);
__top->_M_parent = __p;
try
{
if (__x->_M_right)
__top->_M_right = _M_copy(_S_right(__x), __top);
__p = __top;
__x = _S_left(__x);
while (__x != 0)
{
_Link_type __y = _M_clone_node(__x);
__p->_M_left = __y;
__y->_M_parent = __p;
if (__x->_M_right)
__y->_M_right = _M_copy(_S_right(__x), __y);
__p = __y;
__x = _S_left(__x);
}
}
catch(...)
{
_M_erase(__top);
__throw_exception_again;
}
return __top;
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
void
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::_M_erase(_Link_type __x)
{
// Erase without rebalancing.
while (__x != 0)
{
_M_erase(_S_right(__x));
_Link_type __y = _S_left(__x);
destroy_node(__x);
__x = __y;
}
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
void
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
erase(iterator __first, iterator __last)
{
if (__first == begin() && __last == end())
clear();
else
while (__first != __last) erase(__first++);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
void
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
erase(const _Key* __first, const _Key* __last)
{
while (__first != __last)
erase(*__first++);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::find(const _Key& __k)
{
_Link_type __y = _M_end(); // Last node which is not less than __k.
_Link_type __x = _M_root(); // Current node.
while (__x != 0)
if (!_M_key_compare(_S_key(__x), __k))
__y = __x, __x = _S_left(__x);
else
__x = _S_right(__x);
iterator __j = iterator(__y);
return (__j == end() || _M_key_compare(__k, _S_key(__j._M_node))) ?
end() : __j;
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::const_iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
find(const _Key& __k) const
{
_Link_type __y = _M_end(); // Last node which is not less than __k.
_Link_type __x = _M_root(); // Current node.
while (__x != 0)
{
if (!_M_key_compare(_S_key(__x), __k))
__y = __x, __x = _S_left(__x);
else
__x = _S_right(__x);
}
const_iterator __j = const_iterator(__y);
return (__j == end() || _M_key_compare(__k, _S_key(__j._M_node))) ?
end() : __j;
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::size_type
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
count(const _Key& __k) const
{
pair<const_iterator, const_iterator> __p = equal_range(__k);
size_type __n = std::distance(__p.first, __p.second);
return __n;
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
lower_bound(const _Key& __k)
{
_Link_type __y = _M_end(); // Last node which is not less than __k
_Link_type __x = _M_root(); // Current node.
while (__x != 0)
if (!_M_key_compare(_S_key(__x), __k))
__y = __x, __x = _S_left(__x);
else
__x = _S_right(__x);
return iterator(__y);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::const_iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
lower_bound(const _Key& __k) const
{
_Link_type __y = _M_end(); // Last node which is not less than __k.
_Link_type __x = _M_root(); // Current node.
while (__x != 0)
if (!_M_key_compare(_S_key(__x), __k))
__y = __x, __x = _S_left(__x);
else
__x = _S_right(__x);
return const_iterator(__y);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
upper_bound(const _Key& __k)
{
_Link_type __y = _M_end(); // Last node which is greater than __k.
_Link_type __x = _M_root(); // Current node.
while (__x != 0)
if (_M_key_compare(__k, _S_key(__x)))
__y = __x, __x = _S_left(__x);
else
__x = _S_right(__x);
return iterator(__y);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::const_iterator
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
upper_bound(const _Key& __k) const
{
_Link_type __y = _M_end(); // Last node which is greater than __k.
_Link_type __x = _M_root(); // Current node.
while (__x != 0)
if (_M_key_compare(__k, _S_key(__x)))
__y = __x, __x = _S_left(__x);
else
__x = _S_right(__x);
return const_iterator(__y);
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
inline
pair<typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator,
typename _Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::iterator>
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::
equal_range(const _Key& __k)
{ return pair<iterator, iterator>(lower_bound(__k), upper_bound(__k)); }
template<typename _Key, typename _Val, typename _KoV,
typename _Compare, typename _Alloc>
inline
pair<typename _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::const_iterator,
typename _Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>::const_iterator>
_Rb_tree<_Key, _Val, _KoV, _Compare, _Alloc>
::equal_range(const _Key& __k) const
{
return pair<const_iterator,const_iterator>(lower_bound(__k),
upper_bound(__k));
}
inline int
__black_count(_Rb_tree_node_base* __node, _Rb_tree_node_base* __root)
{
if (__node == 0)
return 0;
int __sum = 0;
do
{
if (__node->_M_color == _S_black)
++__sum;
if (__node == __root)
break;
__node = __node->_M_parent;
}
while (1);
return __sum;
}
template<typename _Key, typename _Val, typename _KeyOfValue,
typename _Compare, typename _Alloc>
bool
_Rb_tree<_Key,_Val,_KeyOfValue,_Compare,_Alloc>::__rb_verify() const
{
if (_M_node_count == 0 || begin() == end())
return _M_node_count == 0 && begin() == end() &&
this->_M_header._M_left == &this->_M_header &&
this->_M_header._M_right == &this->_M_header;
int __len = __black_count(_M_leftmost(), _M_root());
for (const_iterator __it = begin(); __it != end(); ++__it)
{
_Link_type __x = (_Link_type) __it._M_node;
_Link_type __L = _S_left(__x);
_Link_type __R = _S_right(__x);
if (__x->_M_color == _S_red)
if ((__L && __L->_M_color == _S_red)
|| (__R && __R->_M_color == _S_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;
}
} // namespace std
#endif
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