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110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsQueryObject_h
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#define nsQueryObject_h
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#include "mozilla/Attributes.h"
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#include "nsCOMPtr.h"
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#include "nsRefPtr.h"
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/*****************************************************************************/
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template<class T>
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class MOZ_STACK_CLASS nsQueryObject : public nsCOMPtr_helper
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{
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public:
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explicit nsQueryObject(T* aRawPtr)
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: mRawPtr(aRawPtr)
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{
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}
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virtual nsresult NS_FASTCALL operator()(const nsIID& aIID,
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void** aResult) const
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{
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nsresult status = mRawPtr ? mRawPtr->QueryInterface(aIID, aResult)
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: NS_ERROR_NULL_POINTER;
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return status;
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}
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private:
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T* MOZ_NON_OWNING_REF mRawPtr;
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};
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template<class T>
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class MOZ_STACK_CLASS nsQueryObjectWithError : public nsCOMPtr_helper
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{
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public:
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nsQueryObjectWithError(T* aRawPtr, nsresult* aErrorPtr)
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: mRawPtr(aRawPtr), mErrorPtr(aErrorPtr)
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{
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}
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virtual nsresult NS_FASTCALL operator()(const nsIID& aIID,
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void** aResult) const
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{
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nsresult status = mRawPtr ? mRawPtr->QueryInterface(aIID, aResult)
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: NS_ERROR_NULL_POINTER;
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if (mErrorPtr) {
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*mErrorPtr = status;
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}
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return status;
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}
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private:
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T* MOZ_NON_OWNING_REF mRawPtr;
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nsresult* mErrorPtr;
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};
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/*****************************************************************************/
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/*****************************************************************************/
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template<class T>
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inline nsQueryObject<T>
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do_QueryObject(T* aRawPtr)
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{
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return nsQueryObject<T>(aRawPtr);
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}
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template<class T>
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inline nsQueryObject<T>
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do_QueryObject(nsCOMPtr<T>& aRawPtr)
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{
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return nsQueryObject<T>(aRawPtr);
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}
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template<class T>
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inline nsQueryObject<T>
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do_QueryObject(nsRefPtr<T>& aRawPtr)
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{
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return nsQueryObject<T>(aRawPtr);
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}
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template<class T>
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inline nsQueryObjectWithError<T>
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do_QueryObject(T* aRawPtr, nsresult* aErrorPtr)
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{
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return nsQueryObjectWithError<T>(aRawPtr, aErrorPtr);
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}
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template<class T>
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inline nsQueryObjectWithError<T>
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do_QueryObject(nsCOMPtr<T>& aRawPtr, nsresult* aErrorPtr)
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{
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return nsQueryObjectWithError<T>(aRawPtr, aErrorPtr);
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}
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template<class T>
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inline nsQueryObjectWithError<T>
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do_QueryObject(nsRefPtr<T>& aRawPtr, nsresult* aErrorPtr)
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{
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return nsQueryObjectWithError<T>(aRawPtr, aErrorPtr);
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}
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/*****************************************************************************/
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#endif // !defined(nsQueryObject_h)
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