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137 lines
8.3 KiB
C++
137 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nsAgg_h___
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#define nsAgg_h___
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#include "nsISupports.h"
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////////////////////////////////////////////////////////////////////////////////
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// Put this in your class's declaration:
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#define NS_DECL_AGGREGATED \
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NS_DECL_ISUPPORTS \
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\
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public: \
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\
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/* You must implement this operation instead of the nsISupports */ \
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/* methods if you inherit from nsAggregated. */ \
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NS_IMETHOD \
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AggregatedQueryInterface(const nsIID& aIID, void** aInstancePtr); \
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\
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protected: \
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\
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class Internal : public nsISupports { \
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public: \
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\
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Internal() {} \
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\
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NS_IMETHOD QueryInterface(const nsIID& aIID, \
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void** aInstancePtr); \
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NS_IMETHOD_(nsrefcnt) AddRef(void); \
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NS_IMETHOD_(nsrefcnt) Release(void); \
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\
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}; \
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\
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friend class Internal; \
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\
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nsISupports* fOuter; \
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Internal fAggregated; \
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\
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nsISupports* GetInner(void) { return &fAggregated; } \
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\
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public: \
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// Put this in your class's constructor:
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#define NS_INIT_AGGREGATED(outer) \
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PR_BEGIN_MACRO \
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NS_INIT_REFCNT(); \
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fOuter = outer ? outer : &fAggregated; \
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PR_END_MACRO
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// Put this in your class's implementation file:
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#define NS_IMPL_AGGREGATED(_class) \
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NS_IMETHODIMP \
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_class::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
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{ \
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return fOuter->QueryInterface(aIID, aInstancePtr); \
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} \
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\
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NS_IMETHODIMP_(nsrefcnt) \
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_class::AddRef(void) \
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{ \
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return fOuter->AddRef(); \
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} \
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\
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NS_IMETHODIMP_(nsrefcnt) \
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_class::Release(void) \
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{ \
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return fOuter->Release(); \
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} \
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\
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NS_IMETHODIMP \
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_class::Internal::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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return agg->AggregatedQueryInterface(aIID, aInstancePtr); \
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} \
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\
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NS_IMETHODIMP_(nsrefcnt) \
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_class::Internal::AddRef(void) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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NS_PRECONDITION(PRInt32(agg->mRefCnt) >= 0, "illegal refcnt"); \
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++agg->mRefCnt; \
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NS_LOG_ADDREF(this, agg->mRefCnt, #_class, sizeof(*this)); \
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return agg->mRefCnt; \
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} \
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\
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NS_IMETHODIMP_(nsrefcnt) \
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_class::Internal::Release(void) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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NS_PRECONDITION(0 != agg->mRefCnt, "dup release"); \
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--agg->mRefCnt; \
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NS_LOG_RELEASE(this, agg->mRefCnt, #_class); \
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if (agg->mRefCnt == 0) { \
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agg->mRefCnt = 1; /* stabilize */ \
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NS_DELETEXPCOM(agg); \
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return 0; \
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} \
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return agg->mRefCnt; \
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} \
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// for use with QI macros in nsISupportsUtils.h:
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#define NS_IMPL_AGGREGATED_QUERY_HEAD(_class) \
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NS_IMETHODIMP _class::AggregatedQueryInterface(REFNSIID aIID, void** aInstancePtr) \
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{ \
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NS_ASSERTION(aInstancePtr, "AggregatedQueryInterface requires a non-NULL destination!"); \
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if ( !aInstancePtr ) \
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return NS_ERROR_NULL_POINTER; \
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nsISupports* foundInterface;
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#endif /* nsAgg_h___ */
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