зеркало из https://github.com/mozilla/gecko-dev.git
68 строки
2.0 KiB
C++
68 строки
2.0 KiB
C++
/* -*- Mode: IDL; tab-width: 4; 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 Mozilla 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/MPL/
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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 the Mozilla browser.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications, Inc. Portions created by Netscape are
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* Copyright (C) 1999, Mozilla. All Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef __nsInterfaceRequestorUtils_h
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#define __nsInterfaceRequestorUtils_h
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#include "nsCOMPtr.h"
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// a type-safe shortcut for calling the |GetInterface()| member function
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// T must inherit from nsIInterfaceRequestor, but the cast may be ambiguous.
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template <class T, class DestinationType>
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inline
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nsresult
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CallGetInterface( T* aSource, DestinationType** aDestination )
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{
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NS_PRECONDITION(aSource, "null parameter");
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NS_PRECONDITION(aDestination, "null parameter");
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return aSource->GetInterface(NS_GET_IID(DestinationType),
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NS_REINTERPRET_CAST(void**, aDestination));
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}
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class NS_EXPORT nsGetInterface : public nsCOMPtr_helper
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{
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public:
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nsGetInterface( nsISupports* aSource, nsresult* error )
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: mSource(aSource),
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mErrorPtr(error)
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{
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// nothing else to do here
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}
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virtual nsresult operator()( const nsIID&, void** ) const;
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virtual ~nsGetInterface() {};
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private:
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nsCOMPtr<nsISupports> mSource;
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nsresult* mErrorPtr;
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};
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inline
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const nsGetInterface
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do_GetInterface( nsISupports* aSource, nsresult* error = 0 )
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{
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return nsGetInterface(aSource, error);
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}
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#endif // __nsInterfaceRequestorUtils_h
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