| 1 | /* $Id: avl_Destroy.cpp.h 4071 2007-08-07 17:07:59Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * kAVLDestroy - Walk the tree calling a callback to destroy all the nodes.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 1999-2004 knut st. osmundsen ([email protected])
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License as published by the Free Software Foundation,
|
|---|
| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
|
|---|
| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
|
|---|
| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 | #ifndef _kAVLDestroy_h_
|
|---|
| 19 | #define _kAVLDestroy_h_
|
|---|
| 20 |
|
|---|
| 21 |
|
|---|
| 22 | /**
|
|---|
| 23 | * Iterates thru all nodes in the given tree so the caller can free resources
|
|---|
| 24 | * associated with each node.
|
|---|
| 25 | *
|
|---|
| 26 | * @returns 0 on success.
|
|---|
| 27 | * @returns Return code from the callback on failure. The tree might be half
|
|---|
| 28 | * destroyed at this point and will not behave correctly when any
|
|---|
| 29 | * insert or remove operation is attempted.
|
|---|
| 30 | *
|
|---|
| 31 | * @param ppTree Pointer to the AVL-tree root node pointer.
|
|---|
| 32 | * @param pfnCallBack Pointer to callback function.
|
|---|
| 33 | * @param pvParam User parameter passed on to the callback function.
|
|---|
| 34 | */
|
|---|
| 35 | RTDECL(int) KAVL_FN(Destroy)(PPKAVLNODECORE ppTree, PKAVLCALLBACK pfnCallBack, void *pvParam)
|
|---|
| 36 | {
|
|---|
| 37 | KAVLSTACK2 AVLStack;
|
|---|
| 38 | if (*ppTree == KAVL_NULL)
|
|---|
| 39 | return 0;
|
|---|
| 40 |
|
|---|
| 41 | AVLStack.cEntries = 1;
|
|---|
| 42 | AVLStack.achFlags[0] = 0;
|
|---|
| 43 | AVLStack.aEntries[0] = KAVL_GET_POINTER(ppTree);
|
|---|
| 44 | while (AVLStack.cEntries > 0)
|
|---|
| 45 | {
|
|---|
| 46 | int rc;
|
|---|
| 47 | PKAVLNODECORE pNode = AVLStack.aEntries[AVLStack.cEntries - 1];
|
|---|
| 48 |
|
|---|
| 49 | if (!AVLStack.achFlags[AVLStack.cEntries - 1]++)
|
|---|
| 50 | {
|
|---|
| 51 | /* push left and recurse */
|
|---|
| 52 | if (pNode->pLeft != KAVL_NULL)
|
|---|
| 53 | {
|
|---|
| 54 | AVLStack.achFlags[AVLStack.cEntries] = 0; /* 0 first, 1 last */
|
|---|
| 55 | AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pLeft);
|
|---|
| 56 | continue;
|
|---|
| 57 | }
|
|---|
| 58 | }
|
|---|
| 59 |
|
|---|
| 60 | /* pop pNode */
|
|---|
| 61 | AVLStack.cEntries--;
|
|---|
| 62 |
|
|---|
| 63 | /* push right */
|
|---|
| 64 | if (pNode->pRight != KAVL_NULL)
|
|---|
| 65 | {
|
|---|
| 66 | AVLStack.achFlags[AVLStack.cEntries] = 0;
|
|---|
| 67 | AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pRight);
|
|---|
| 68 | }
|
|---|
| 69 |
|
|---|
| 70 | /* call destructor */
|
|---|
| 71 | pNode->pRight = pNode->pLeft = KAVL_NULL;
|
|---|
| 72 | rc = pfnCallBack(pNode, pvParam);
|
|---|
| 73 | if (rc)
|
|---|
| 74 | return rc;
|
|---|
| 75 |
|
|---|
| 76 | } /* while */
|
|---|
| 77 |
|
|---|
| 78 | *ppTree = KAVL_NULL;
|
|---|
| 79 | return 0;
|
|---|
| 80 | }
|
|---|
| 81 |
|
|---|
| 82 |
|
|---|
| 83 | #endif
|
|---|
| 84 |
|
|---|
| 85 |
|
|---|
