80 lines
2.6 KiB
Plaintext
80 lines
2.6 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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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#include "nsISupports.idl"
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%{C++
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#include "mozilla/MemoryReporting.h"
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%}
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/**
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* An instance of |nsIWeakReference| is a proxy object that cooperates with
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* its referent to give clients a non-owning, non-dangling reference. Clients
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* own the proxy, and should generally manage it with an |nsCOMPtr| (see the
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* type |nsWeakPtr| for a |typedef| name that stands out) as they would any
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* other XPCOM object. The |QueryReferent| member function provides a
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* (hopefully short-lived) owning reference on demand, through which clients
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* can get useful access to the referent, while it still exists.
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*
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* @version 1.0
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* @see nsISupportsWeakReference
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* @see nsWeakReference
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* @see nsWeakPtr
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*/
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[scriptable, uuid(9188bc85-f92e-11d2-81ef-0060083a0bcf)]
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interface nsIWeakReference : nsISupports
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{
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/**
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* |QueryReferent| queries the referent, if it exists, and like |QueryInterface|, produces
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* an owning reference to the desired interface. It is designed to look and act exactly
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* like (a proxied) |QueryInterface|. Don't hold on to the produced interface permanently;
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* that would defeat the purpose of using a non-owning |nsIWeakReference| in the first place.
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*/
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void QueryReferent( in nsIIDRef uuid, [iid_is(uuid), retval] out nsQIResult result );
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%{C++
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virtual size_t SizeOfOnlyThis(mozilla::MallocSizeOf aMallocSizeOf) const = 0;
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/**
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* Returns true if the referring object is alive. Otherwise, false.
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*/
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virtual bool IsAlive() const = 0;
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%}
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};
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/**
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* |nsISupportsWeakReference| is a factory interface which produces appropriate
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* instances of |nsIWeakReference|. Weak references in this scheme can only be
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* produced for objects that implement this interface.
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*
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* @version 1.0
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* @see nsIWeakReference
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* @see nsSupportsWeakReference
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*/
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[scriptable, uuid(9188bc86-f92e-11d2-81ef-0060083a0bcf)]
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interface nsISupportsWeakReference : nsISupports
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{
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/**
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* |GetWeakReference| produces an appropriate instance of |nsIWeakReference|.
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* As with all good XPCOM `getters', you own the resulting interface and should
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* manage it with an |nsCOMPtr|.
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*
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* @see nsIWeakReference
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* @see nsWeakPtr
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* @see nsCOMPtr
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*/
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nsIWeakReference GetWeakReference();
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};
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%{C++
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#ifdef MOZILLA_INTERNAL_API
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#include "nsIWeakReferenceUtils.h"
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#endif
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%}
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