84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
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/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications, Inc.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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_COM_GLUE 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 NS_FASTCALL operator()( const nsIID&, void** ) const;
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private:
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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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