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265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
84 lines
3.2 KiB
C++
84 lines
3.2 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 nsIWeakReferenceUtils_h__
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#define nsIWeakReferenceUtils_h__
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#include "nsCOMPtr.h"
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#include "nsIWeakReference.h"
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typedef nsCOMPtr<nsIWeakReference> nsWeakPtr;
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/**
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*
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*/
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// a type-safe shortcut for calling the |QueryReferent()| member function
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// T must inherit from nsIWeakReference, but the cast may be ambiguous.
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template <class T, class DestinationType>
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inline nsresult CallQueryReferent(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->QueryReferent(NS_GET_TEMPLATE_IID(DestinationType),
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reinterpret_cast<void**>(aDestination));
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}
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inline const nsQueryReferent do_QueryReferent(nsIWeakReference* aRawPtr,
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nsresult* aError = 0) {
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return nsQueryReferent(aRawPtr, aError);
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}
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/**
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* Deprecated, use |do_GetWeakReference| instead.
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*/
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extern nsIWeakReference* NS_GetWeakReference(nsISupports*,
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nsresult* aResult = 0);
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extern nsIWeakReference* NS_GetWeakReference(nsISupportsWeakReference*,
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nsresult* aResult = 0);
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/**
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* |do_GetWeakReference| is a convenience function that bundles up all the work
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* needed to get a weak reference to an arbitrary object, i.e., the
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* |QueryInterface|, test, and call through to |GetWeakReference|, and put it
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* into your |nsCOMPtr|. It is specifically designed to cooperate with
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* |nsCOMPtr| (or |nsWeakPtr|) like so: |nsWeakPtr myWeakPtr =
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* do_GetWeakReference(aPtr);|.
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*/
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inline already_AddRefed<nsIWeakReference> do_GetWeakReference(
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nsISupports* aRawPtr, nsresult* aError = 0) {
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return dont_AddRef(NS_GetWeakReference(aRawPtr, aError));
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}
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inline already_AddRefed<nsIWeakReference> do_GetWeakReference(
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nsISupportsWeakReference* aRawPtr, nsresult* aError = 0) {
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return dont_AddRef(NS_GetWeakReference(aRawPtr, aError));
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}
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inline void do_GetWeakReference(nsIWeakReference* aRawPtr,
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nsresult* aError = 0) {
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// This signature exists solely to _stop_ you from doing a bad thing.
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// Saying |do_GetWeakReference()| on a weak reference itself,
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// is very likely to be a programmer error.
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}
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template <class T>
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inline void do_GetWeakReference(already_AddRefed<T>&) {
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// This signature exists solely to _stop_ you from doing the bad thing.
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// Saying |do_GetWeakReference()| on a pointer that is not otherwise owned by
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// someone else is an automatic leak. See
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// <http://bugzilla.mozilla.org/show_bug.cgi?id=8221>.
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}
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template <class T>
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inline void do_GetWeakReference(already_AddRefed<T>&, nsresult*) {
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// This signature exists solely to _stop_ you from doing the bad thing.
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// Saying |do_GetWeakReference()| on a pointer that is not otherwise owned by
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// someone else is an automatic leak. See
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// <http://bugzilla.mozilla.org/show_bug.cgi?id=8221>.
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}
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#endif
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