1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/glue/nsIInterfaceRequestorUtils.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,51 @@
1.4 +/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef __nsInterfaceRequestorUtils_h
1.11 +#define __nsInterfaceRequestorUtils_h
1.12 +
1.13 +#include "nsCOMPtr.h"
1.14 +
1.15 +// a type-safe shortcut for calling the |GetInterface()| member function
1.16 +// T must inherit from nsIInterfaceRequestor, but the cast may be ambiguous.
1.17 +template <class T, class DestinationType>
1.18 +inline
1.19 +nsresult
1.20 +CallGetInterface( T* aSource, DestinationType** aDestination )
1.21 + {
1.22 + NS_PRECONDITION(aSource, "null parameter");
1.23 + NS_PRECONDITION(aDestination, "null parameter");
1.24 +
1.25 + return aSource->GetInterface(NS_GET_TEMPLATE_IID(DestinationType),
1.26 + reinterpret_cast<void**>(aDestination));
1.27 + }
1.28 +
1.29 +class NS_COM_GLUE nsGetInterface : public nsCOMPtr_helper
1.30 + {
1.31 + public:
1.32 + nsGetInterface( nsISupports* aSource, nsresult* error )
1.33 + : mSource(aSource),
1.34 + mErrorPtr(error)
1.35 + {
1.36 + // nothing else to do here
1.37 + }
1.38 +
1.39 + virtual nsresult NS_FASTCALL operator()( const nsIID&, void** ) const;
1.40 +
1.41 + private:
1.42 + nsISupports* mSource;
1.43 + nsresult* mErrorPtr;
1.44 + };
1.45 +
1.46 +inline
1.47 +const nsGetInterface
1.48 +do_GetInterface( nsISupports* aSource, nsresult* error = 0 )
1.49 + {
1.50 + return nsGetInterface(aSource, error);
1.51 + }
1.52 +
1.53 +#endif // __nsInterfaceRequestorUtils_h
1.54 +
