avl_Range.cpp.h revision 677833bc953b6cb418c701facbdcf4aa18d6c44e
/* $Id$ */
/** @file
* kAVLRange - Range routines for AVL trees.
*/
/*
* Copyright (C) 1999-2006 knut st. osmundsen (bird-src-spam@anduin.net)
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file 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,
* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
* distribution. VirtualBox OSE is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY of any kind.
*
* If you received this file as part of a commercial VirtualBox
* distribution, then only the terms of your commercial VirtualBox
* license agreement apply instead of the previous paragraph.
*/
#ifndef _kAVLRange_h_
#define _kAVLRange_h_
/**
* Finds the range containing the specified key.
*
* @returns Pointer to the matching range.
*
* @param ppTree Pointer to Pointer to the tree root node.
* @param Key The Key to find matching range for.
*/
PKAVLNODECORE KAVL_FN(RangeGet)(PPKAVLNODECORE ppTree, register KAVLKEY Key)
{
register PKAVLNODECORE pNode = KAVL_GET_POINTER_NULL(ppTree);
if (pNode)
{
for (;;)
{
if (KAVL_R_IS_IN_RANGE(pNode->Key, pNode->KeyLast, Key))
return pNode;
if (KAVL_G(pNode->Key, Key))
{
if (pNode->pLeft != KAVL_NULL)
pNode = KAVL_GET_POINTER(&pNode->pLeft);
else
return NULL;
}
else
{
if (pNode->pRight != KAVL_NULL)
pNode = KAVL_GET_POINTER(&pNode->pRight);
else
return NULL;
}
}
}
return NULL;
}
/**
* Removes the range containing the specified key.
*
* @returns Pointer to the matching range.
*
* @param ppTree Pointer to Pointer to the tree root node.
* @param Key The Key to remove matching range for.
*/
PKAVLNODECORE KAVL_FN(RangeRemove)(PPKAVLNODECORE ppTree, KAVLKEY Key)
{
PKAVLNODECORE pNode = KAVL_FN(RangeGet)(ppTree, Key);
if (pNode)
return KAVL_FN(Remove)(ppTree, pNode->Key);
return NULL;
}
#endif