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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#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) {
MOZ_ASSERT(aSource, "null parameter");
MOZ_ASSERT(aDestination, "null parameter");
return aSource->GetInterface(NS_GET_TEMPLATE_IID(DestinationType),
class MOZ_STACK_CLASS nsGetInterface final : public nsCOMPtr_helper {
nsGetInterface(nsISupports* aSource, nsresult* aError)
: mSource(aSource), mErrorPtr(aError) {}
virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override;
nsISupports* MOZ_NON_OWNING_REF mSource;
nsresult* mErrorPtr;
inline const nsGetInterface do_GetInterface(nsISupports* aSource,
nsresult* aError = 0) {
return nsGetInterface(aSource, aError);
#endif // __nsInterfaceRequestorUtils_h