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/gecko_api/include/nsArrayUtils.h

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C++ Header | 73 lines | 27 code | 7 blank | 39 comment | 0 complexity | 70ad665b45d88a92af250c0f351055ae MD5 | raw file
 1/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 2/* ***** BEGIN LICENSE BLOCK *****
 3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 4 *
 5 * The contents of this file are subject to the Mozilla Public License Version
 6 * 1.1 (the "License"); you may not use this file except in compliance with
 7 * the License. You may obtain a copy of the License at
 8 * http://www.mozilla.org/MPL/
 9 *
10 * Software distributed under the License is distributed on an "AS IS" basis,
11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 * for the specific language governing rights and limitations under the
13 * License.
14 *
15 * The Original Code is XPCOM Array implementation.
16 *
17 * The Initial Developer of the Original Code is
18 * Netscape Communications Corp.
19 * Portions created by the Initial Developer are Copyright (C) 2002
20 * the Initial Developer. All Rights Reserved.
21 *
22 * Contributor(s):
23 *   Alec Flett <alecf@netscape.com>
24 *
25 * Alternatively, the contents of this file may be used under the terms of
26 * either the GNU General Public License Version 2 or later (the "GPL"), or
27 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 * in which case the provisions of the GPL or the LGPL are applicable instead
29 * of those above. If you wish to allow use of your version of this file only
30 * under the terms of either the GPL or the LGPL, and not to allow others to
31 * use your version of this file under the terms of the MPL, indicate your
32 * decision by deleting the provisions above and replace them with the notice
33 * and other provisions required by the GPL or the LGPL. If you do not delete
34 * the provisions above, a recipient may use your version of this file under
35 * the terms of any one of the MPL, the GPL or the LGPL.
36 *
37 * ***** END LICENSE BLOCK ***** */
38
39#ifndef nsArrayUtils_h__
40#define nsArrayUtils_h__
41
42#include "nsCOMPtr.h"
43#include "nsIArray.h"
44
45// helper class for do_QueryElementAt
46class NS_COM_GLUE nsQueryArrayElementAt : public nsCOMPtr_helper
47  {
48    public:
49      nsQueryArrayElementAt(nsIArray* aArray, PRUint32 aIndex,
50                            nsresult* aErrorPtr)
51          : mArray(aArray),
52            mIndex(aIndex),
53            mErrorPtr(aErrorPtr)
54        {
55          // nothing else to do here
56        }
57
58      virtual nsresult NS_FASTCALL operator()(const nsIID& aIID, void**) const;
59
60    private:
61      nsIArray*  mArray;
62      PRUint32   mIndex;
63      nsresult*  mErrorPtr;
64  };
65
66inline
67const nsQueryArrayElementAt
68do_QueryElementAt(nsIArray* aArray, PRUint32 aIndex, nsresult* aErrorPtr = 0)
69  {
70    return nsQueryArrayElementAt(aArray, aIndex, aErrorPtr);
71  }
72
73#endif // nsArrayUtils_h__