| 1 | /* $Id: avl_RemoveBestFit.cpp.h 4687 2007-09-11 09:13:32Z vboxsync $ */
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| 2 | /** @file
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| 3 | * kAVLRemoveBestFit - Remove Best Fit routine for AVL trees.
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| 4 | * Intended specially on heaps. The tree should allow duplicate keys.
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| 5 | *
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| 6 | */
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| 7 |
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| 8 | /*
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| 9 | * Copyright (C) 1999-2002 knut st. osmundsen (bird-src-spam@anduin.net)
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| 10 | *
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| 11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 12 | * available from http://www.virtualbox.org. This file is free software;
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| 13 | * you can redistribute it and/or modify it under the terms of the GNU
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| 14 | * General Public License as published by the Free Software Foundation,
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| 15 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 16 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 17 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 18 | */
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| 19 |
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| 20 | #ifndef _kAVLRemoveBestFit_h_
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| 21 | #define _kAVLRemoveBestFit_h_
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| 22 |
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| 23 |
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| 24 | /**
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| 25 | * Finds the best fitting node in the tree for the given Key value.
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| 26 | * And removes it.
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| 27 | * @returns Pointer to the best fitting node found.
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| 28 | * @param ppTree Pointer to Pointer to the tree root node.
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| 29 | * @param Key The Key of which is to be found a best fitting match for..
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| 30 | * @param fAbove TRUE: Returned node is have the closest key to Key from above.
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| 31 | * FALSE: Returned node is have the closest key to Key from below.
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| 32 | * @sketch The best fitting node is always located in the searchpath above you.
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| 33 | * >= (above): The node where you last turned left.
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| 34 | * <= (below): the node where you last turned right.
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| 35 | * @remark This implementation should be speeded up slightly!
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| 36 | */
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| 37 | RTDECL(PKAVLNODECORE) KAVL_FN(RemoveBestFit)(PPKAVLNODECORE ppTree, KAVLKEY Key, bool fAbove)
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| 38 | {
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| 39 | /*
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| 40 | * If we find anything we'll have to remove the node and return it.
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| 41 | * But, if duplicate keys are allowed we'll have to check for multiple
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| 42 | * nodes first and return one of them before doing an expensive remove+insert.
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| 43 | */
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| 44 | PKAVLNODECORE pNode = KAVL_FN(GetBestFit)(ppTree, Key, fAbove);
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| 45 | if (pNode != NULL)
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| 46 | {
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| 47 | #ifdef KAVL_EQUAL_ALLOWED
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| 48 | if (pNode->pList != KAVL_NULL)
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| 49 | {
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| 50 | PKAVLNODECORE pRet = KAVL_GET_POINTER(&pNode->pList);
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| 51 | KAVL_SET_POINTER_NULL(&pNode->pList, &pRet->pList);
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| 52 | return pRet;
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| 53 | }
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| 54 | #endif
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| 55 | pNode = KAVL_FN(Remove)(ppTree, pNode->Key);
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| 56 | }
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| 57 | return pNode;
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| 58 | }
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| 59 |
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| 60 |
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| 61 | #endif
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