forked from mirrors/gecko-dev
265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
40 lines
1.5 KiB
C++
40 lines
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 nsresult CallGetInterface(T* aSource, DestinationType** aDestination) {
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MOZ_ASSERT(aSource, "null parameter");
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MOZ_ASSERT(aDestination, "null parameter");
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return aSource->GetInterface(NS_GET_TEMPLATE_IID(DestinationType),
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reinterpret_cast<void**>(aDestination));
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}
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class MOZ_STACK_CLASS nsGetInterface final : public nsCOMPtr_helper {
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public:
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nsGetInterface(nsISupports* aSource, nsresult* aError)
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: mSource(aSource), mErrorPtr(aError) {}
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virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override;
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private:
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nsISupports* MOZ_NON_OWNING_REF mSource;
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nsresult* mErrorPtr;
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};
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inline const nsGetInterface do_GetInterface(nsISupports* aSource,
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nsresult* aError = 0) {
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return nsGetInterface(aSource, aError);
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}
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#endif // __nsInterfaceRequestorUtils_h
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