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/gecko_api/include/nsWeakReference.h

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 1/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 2 *
 3 * ***** BEGIN LICENSE BLOCK *****
 4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 5 *
 6 * The contents of this file are subject to the Mozilla Public License Version
 7 * 1.1 (the "License"); you may not use this file except in compliance with
 8 * the License. You may obtain a copy of the License at
 9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * The Original Code is the Mozilla browser.
17 *
18 * The Initial Developer of the Original Code is
19 * Netscape Communications, Inc.
20 * Portions created by the Initial Developer are Copyright (C) 1999
21 * the Initial Developer. All Rights Reserved.
22 *
23 * Contributor(s):
24 *   Scott Collins <scc@netscape.com>
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * either of the GNU General Public License Version 2 or later (the "GPL"),
28 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 * in which case the provisions of the GPL or the LGPL are applicable instead
30 * of those above. If you wish to allow use of your version of this file only
31 * under the terms of either the GPL or the LGPL, and not to allow others to
32 * use your version of this file under the terms of the MPL, indicate your
33 * decision by deleting the provisions above and replace them with the notice
34 * and other provisions required by the GPL or the LGPL. If you do not delete
35 * the provisions above, a recipient may use your version of this file under
36 * the terms of any one of the MPL, the GPL or the LGPL.
37 *
38 * ***** END LICENSE BLOCK ***** */
39
40#ifndef nsWeakReference_h__
41#define nsWeakReference_h__
42
43// nsWeakReference.h
44
45#include "nsIWeakReference.h"
46#include "nsIWeakReferenceUtils.h"
47
48class nsWeakReference;
49
50// Set IMETHOD_VISIBILITY to empty so that the class-level NS_COM declaration
51// controls member method visibility.
52#undef  IMETHOD_VISIBILITY
53#define IMETHOD_VISIBILITY NS_COM_GLUE
54
55class NS_COM_GLUE nsSupportsWeakReference : public nsISupportsWeakReference
56  {
57    public:
58      nsSupportsWeakReference()
59          : mProxy(0)
60        {
61          // nothing else to do here
62        }
63
64      NS_DECL_NSISUPPORTSWEAKREFERENCE
65
66    protected:
67      inline ~nsSupportsWeakReference();
68
69    private:
70      friend class nsWeakReference;
71
72      void
73      NoticeProxyDestruction()
74          // ...called (only) by an |nsWeakReference| from _its_ dtor.
75        {
76          mProxy = 0;
77        }
78
79      nsWeakReference* mProxy;
80
81		protected:
82
83			void ClearWeakReferences();
84			PRBool HasWeakReferences() const {return mProxy != 0;}
85  };
86
87#undef  IMETHOD_VISIBILITY
88#define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
89
90inline
91nsSupportsWeakReference::~nsSupportsWeakReference()
92  {
93  	ClearWeakReferences();
94  }
95
96#endif