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67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsISizeOfHandler_h___
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#define nsISizeOfHandler_h___
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#include "nscore.h"
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#include "nsISupports.h"
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/* c028d1f0-fc9e-11d1-89e4-006008911b81 */
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#define NS_ISIZEOF_HANDLER_IID \
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{ 0xc028d1f0, 0xfc9e, 0x11d1, {0x89, 0xe4, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81}}
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/**
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* An API to managing a sizeof computation of an arbitrary graph.
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* The handler is responsible for remembering which objects have been
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* seen before. Note that the handler doesn't hold references to
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* nsISupport's objects; the assumption is that the objects being
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* sized are stationary and will not be modified during the sizing
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* computation and therefore do not need an extra reference count.
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*/
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class nsISizeOfHandler : public nsISupports {
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public:
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/**
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* Add in a simple size value to the running total.
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* Always returns NS_OK.
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*/
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NS_IMETHOD Add(size_t aSize) = 0;
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/**
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* Update aResult with PR_TRUE if the object has been traversed
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* by the sizeof computation before. Otherwise aResult is set to
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* PR_FALSE and the object is added to the internal database
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* of objects that have been traversed. It's ok to pass a null
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* pointer in; aResult will be set to PR_TRUE so you won't accidently
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* try to traverse through null pointer.
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*
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* Note: This violates the COM API standard on purpose; so there!
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*/
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virtual PRBool HaveSeen(void* anObject) = 0;
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/**
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* Return the currently computed size.
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* Always returns NS_OK.
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*/
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NS_IMETHOD GetSize(PRUint32& aResult) = 0;
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};
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extern NS_BASE nsresult
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NS_NewSizeOfHandler(nsISizeOfHandler** aInstancePtrResult);
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#endif /* nsISizeofHandler_h___ */
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