mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-06 09:05:45 +00:00
67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* 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 http://www.mozilla.org/MPL/
|
|
*
|
|
* 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 License.
|
|
*
|
|
* The Original Code is the Mozilla browser.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications, Inc. Portions created by Netscape are
|
|
* Copyright (C) 1999, Mozilla. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
|
|
#ifndef __nsInterfaceRequestorUtils_h
|
|
#define __nsInterfaceRequestorUtils_h
|
|
|
|
#include "nsCOMPtr.h"
|
|
|
|
// a type-safe shortcut for calling the |GetInterface()| member function
|
|
// T must inherit from nsIInterfaceRequestor, but the cast may be ambiguous.
|
|
template <class T, class DestinationType>
|
|
inline
|
|
nsresult
|
|
CallGetInterface( T* aSource, DestinationType** aDestination )
|
|
{
|
|
NS_PRECONDITION(aSource, "null parameter");
|
|
NS_PRECONDITION(aDestination, "null parameter");
|
|
|
|
return aSource->GetInterface(NS_GET_IID(DestinationType),
|
|
NS_REINTERPRET_CAST(void**, aDestination));
|
|
}
|
|
|
|
class NS_COM nsGetInterface : public nsCOMPtr_helper
|
|
{
|
|
public:
|
|
nsGetInterface( nsISupports* aSource, nsresult* error )
|
|
: mSource(aSource),
|
|
mErrorPtr(error)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
virtual nsresult operator()( const nsIID&, void** ) const;
|
|
|
|
private:
|
|
nsCOMPtr<nsISupports> mSource;
|
|
nsresult* mErrorPtr;
|
|
};
|
|
|
|
inline
|
|
const nsGetInterface
|
|
do_GetInterface( nsISupports* aSource, nsresult* error = 0 )
|
|
{
|
|
return nsGetInterface(aSource, error);
|
|
}
|
|
|
|
#endif // __nsInterfaceRequestorUtils_h
|
|
|