| 1 | /* $Id: avl_RemoveBestFit.cpp.h 28800 2010-04-27 08:22:32Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * kAVLRemoveBestFit - Remove Best Fit routine for AVL trees.
|
|---|
| 4 | * Intended specially on heaps. The tree should allow duplicate keys.
|
|---|
| 5 | *
|
|---|
| 6 | */
|
|---|
| 7 |
|
|---|
| 8 | /*
|
|---|
| 9 | * Copyright (C) 1999-2002 knut st. osmundsen (bird-src-spam@anduin.net)
|
|---|
| 10 | *
|
|---|
| 11 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 12 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 13 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 14 | * General Public License (GPL) as published by the Free Software
|
|---|
| 15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 18 | *
|
|---|
| 19 | * The contents of this file may alternatively be used under the terms
|
|---|
| 20 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 21 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 22 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 23 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 24 | *
|
|---|
| 25 | * You may elect to license modified versions of this file under the
|
|---|
| 26 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | #ifndef _kAVLRemoveBestFit_h_
|
|---|
| 30 | #define _kAVLRemoveBestFit_h_
|
|---|
| 31 |
|
|---|
| 32 |
|
|---|
| 33 | /**
|
|---|
| 34 | * Finds the best fitting node in the tree for the given Key value.
|
|---|
| 35 | * And removes it.
|
|---|
| 36 | * @returns Pointer to the best fitting node found.
|
|---|
| 37 | * @param ppTree Pointer to Pointer to the tree root node.
|
|---|
| 38 | * @param Key The Key of which is to be found a best fitting match for..
|
|---|
| 39 | * @param fAbove TRUE: Returned node is have the closest key to Key from above.
|
|---|
| 40 | * FALSE: Returned node is have the closest key to Key from below.
|
|---|
| 41 | * @sketch The best fitting node is always located in the searchpath above you.
|
|---|
| 42 | * >= (above): The node where you last turned left.
|
|---|
| 43 | * <= (below): the node where you last turned right.
|
|---|
| 44 | * @remark This implementation should be speeded up slightly!
|
|---|
| 45 | */
|
|---|
| 46 | RTDECL(PKAVLNODECORE) KAVL_FN(RemoveBestFit)(PPKAVLNODECORE ppTree, KAVLKEY Key, bool fAbove)
|
|---|
| 47 | {
|
|---|
| 48 | /*
|
|---|
| 49 | * If we find anything we'll have to remove the node and return it.
|
|---|
| 50 | * But, if duplicate keys are allowed we'll have to check for multiple
|
|---|
| 51 | * nodes first and return one of them before doing an expensive remove+insert.
|
|---|
| 52 | */
|
|---|
| 53 | PKAVLNODECORE pNode = KAVL_FN(GetBestFit)(ppTree, Key, fAbove);
|
|---|
| 54 | if (pNode != NULL)
|
|---|
| 55 | {
|
|---|
| 56 | #ifdef KAVL_EQUAL_ALLOWED
|
|---|
| 57 | if (pNode->pList != KAVL_NULL)
|
|---|
| 58 | {
|
|---|
| 59 | PKAVLNODECORE pRet = KAVL_GET_POINTER(&pNode->pList);
|
|---|
| 60 | KAVL_SET_POINTER_NULL(&pNode->pList, &pRet->pList);
|
|---|
| 61 | return pRet;
|
|---|
| 62 | }
|
|---|
| 63 | #endif
|
|---|
| 64 | pNode = KAVL_FN(Remove)(ppTree, pNode->Key);
|
|---|
| 65 | }
|
|---|
| 66 | return pNode;
|
|---|
| 67 | }
|
|---|
| 68 |
|
|---|
| 69 |
|
|---|
| 70 | #endif
|
|---|
