gecko-dev/xpcom/base/nsInterfaceRequestorAgg.h

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
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 * The Original Code is Mozilla.
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 * The Initial Developer of the Original Code is IBM Corporation.
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 * IBM Corporation. All Rights Reserved.
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 * Contributor(s):
 *   Darin Fisher <darin@meer.net>
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 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#ifndef nsInterfaceRequestorAgg_h__
#define nsInterfaceRequestorAgg_h__

#include "nsIInterfaceRequestor.h"

/**
 * This function returns an instance of nsIInterfaceRequestor that aggregates
 * two nsIInterfaceRequestor instances.  Its GetInterface method queries
 * aFirst for the requested interface and will query aSecond only if aFirst
 * failed to supply the requested interface.  Both aFirst and aSecond may
 * be null.
 */
extern NS_COM nsresult
NS_NewInterfaceRequestorAggregation(nsIInterfaceRequestor  *aFirst,
                                    nsIInterfaceRequestor  *aSecond,
                                    nsIInterfaceRequestor **aResult);

#endif // !defined( nsInterfaceRequestorAgg_h__ )