gecko-dev/xpcom/ds/nsAVLTree.h

79 lines
2.1 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsAVLTree_h___
#define nsAVLTree_h___
#include "nscore.h"
enum eAVLStatus {eAVL_unknown,eAVL_ok,eAVL_fail,eAVL_duplicate};
struct nsAVLNode;
/**
*
* @update gess12/26/98
* @param anObject1 is the first object to be compared
* @param anObject2 is the second object to be compared
* @return -1,0,1 if object1 is less, equal, greater than object2
*/
class NS_COM nsAVLNodeComparitor {
public:
virtual PRInt32 operator()(void* anItem1,void* anItem2)=0;
};
class NS_COM nsAVLNodeFunctor {
public:
virtual void* operator()(void* anItem)=0;
};
class NS_COM nsAVLTree {
public:
nsAVLTree(nsAVLNodeComparitor& aComparitor, nsAVLNodeFunctor* aDeallocator);
~nsAVLTree(void);
PRBool operator==(const nsAVLTree& aOther) const;
PRInt32 GetCount(void) const {return mCount;}
//main functions...
eAVLStatus AddItem(void* anItem);
eAVLStatus RemoveItem(void* anItem);
void* FindItem(void* anItem) const;
void ForEach(nsAVLNodeFunctor& aFunctor) const;
void ForEachDepthFirst(nsAVLNodeFunctor& aFunctor) const;
void* FirstThat(nsAVLNodeFunctor& aFunctor) const;
protected:
nsAVLNode* mRoot;
PRInt32 mCount;
nsAVLNodeComparitor& mComparitor;
nsAVLNodeFunctor* mDeallocator;
};
#endif /* nsAVLTree_h___ */