| 1 | /* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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| 2 | *
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| 3 | * ***** BEGIN LICENSE BLOCK *****
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| 4 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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| 5 | *
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| 6 | * The contents of this file are subject to the Mozilla Public License Version
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| 7 | * 1.1 (the "License"); you may not use this file except in compliance with
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| 8 | * the License. You may obtain a copy of the License at
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| 9 | * http://www.mozilla.org/MPL/
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| 10 | *
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| 11 | * Software distributed under the License is distributed on an "AS IS" basis,
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| 12 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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| 13 | * for the specific language governing rights and limitations under the
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| 14 | * License.
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| 15 | *
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| 16 | * The Original Code is the Mozilla browser.
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| 17 | *
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| 18 | * The Initial Developer of the Original Code is
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| 19 | * Netscape Communications, Inc.
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| 20 | * Portions created by the Initial Developer are Copyright (C) 1999
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| 21 | * the Initial Developer. All Rights Reserved.
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| 22 | *
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| 23 | * Contributor(s):
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| 24 | * Pierre Phaneuf <[email protected]>
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| 25 | *
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| 26 | * Alternatively, the contents of this file may be used under the terms of
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| 27 | * either of the GNU General Public License Version 2 or later (the "GPL"),
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| 28 | * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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| 29 | * in which case the provisions of the GPL or the LGPL are applicable instead
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| 30 | * of those above. If you wish to allow use of your version of this file only
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| 31 | * under the terms of either the GPL or the LGPL, and not to allow others to
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| 32 | * use your version of this file under the terms of the MPL, indicate your
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| 33 | * decision by deleting the provisions above and replace them with the notice
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| 34 | * and other provisions required by the GPL or the LGPL. If you do not delete
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| 35 | * the provisions above, a recipient may use your version of this file under
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| 36 | * the terms of any one of the MPL, the GPL or the LGPL.
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| 37 | *
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| 38 | * ***** END LICENSE BLOCK ***** */
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| 39 |
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| 40 | #include "nsISupports.idl"
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| 41 |
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| 42 |
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| 43 | /**
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| 44 | * An instance of |nsIWeakReference| is a proxy object that cooperates with
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| 45 | * its referent to give clients a non-owning, non-dangling reference. Clients
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| 46 | * own the proxy, and should generally manage it with an |nsCOMPtr| (see the
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| 47 | * type |nsWeakPtr| for a |typedef| name that stands out) as they would any
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| 48 | * other XPCOM object. The |QueryReferent| member function provides a
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| 49 | * (hopefully short-lived) owning reference on demand, through which clients
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| 50 | * can get useful access to the referent, while it still exists.
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| 51 | *
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| 52 | * @status FROZEN
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| 53 | * @version 1.0
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| 54 | * @see nsISupportsWeakReference
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| 55 | * @see nsWeakReference
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| 56 | * @see nsWeakPtr
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| 57 | */
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| 58 | [scriptable, uuid(9188bc85-f92e-11d2-81ef-0060083a0bcf)]
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| 59 | interface nsIWeakReference : nsISupports
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| 60 | {
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| 61 | /**
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| 62 | * |QueryReferent| queries the referent, if it exists, and like |QueryInterface|, produces
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| 63 | * an owning reference to the desired interface. It is designed to look and act exactly
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| 64 | * like (a proxied) |QueryInterface|. Don't hold on to the produced interface permanently;
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| 65 | * that would defeat the purpose of using a non-owning |nsIWeakReference| in the first place.
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| 66 | */
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| 67 | void QueryReferent( in nsIIDRef uuid, [iid_is(uuid), retval] out nsQIResult result );
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| 68 | };
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| 69 |
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| 70 |
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| 71 | /**
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| 72 | * |nsISupportsWeakReference| is a factory interface which produces appropriate
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| 73 | * instances of |nsIWeakReference|. Weak references in this scheme can only be
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| 74 | * produced for objects that implement this interface.
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| 75 | *
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| 76 | * @status FROZEN
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| 77 | * @version 1.0
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| 78 | * @see nsIWeakReference
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| 79 | * @see nsSupportsWeakReference
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| 80 | */
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| 81 | [scriptable, uuid(9188bc86-f92e-11d2-81ef-0060083a0bcf)]
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| 82 | interface nsISupportsWeakReference : nsISupports
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| 83 | {
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| 84 | /**
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| 85 | * |GetWeakReference| produces an appropriate instance of |nsIWeakReference|.
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| 86 | * As with all good XPCOM `getters', you own the resulting interface and should
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| 87 | * manage it with an |nsCOMPtr|.
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| 88 | *
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| 89 | * @see nsIWeakReference
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| 90 | * @see nsWeakPtr
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| 91 | * @see nsCOMPtr
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| 92 | */
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| 93 | nsIWeakReference GetWeakReference();
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| 94 | };
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| 95 |
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| 96 |
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| 97 | %{C++
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| 98 | #ifndef MOZILLA_STRICT_API
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| 99 | #include "nsIWeakReferenceUtils.h"
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| 100 | #endif
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| 101 | %}
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| 102 |
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