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/gecko_api/include/nsArrayUtils.h

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  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. #ifndef nsArrayUtils_h__
  39. #define nsArrayUtils_h__
  40. #include "nsCOMPtr.h"
  41. #include "nsIArray.h"
  42. // helper class for do_QueryElementAt
  43. class NS_COM_GLUE nsQueryArrayElementAt : public nsCOMPtr_helper
  44. {
  45. public:
  46. nsQueryArrayElementAt(nsIArray* aArray, PRUint32 aIndex,
  47. nsresult* aErrorPtr)
  48. : mArray(aArray),
  49. mIndex(aIndex),
  50. mErrorPtr(aErrorPtr)
  51. {
  52. // nothing else to do here
  53. }
  54. virtual nsresult NS_FASTCALL operator()(const nsIID& aIID, void**) const;
  55. private:
  56. nsIArray* mArray;
  57. PRUint32 mIndex;
  58. nsresult* mErrorPtr;
  59. };
  60. inline
  61. const nsQueryArrayElementAt
  62. do_QueryElementAt(nsIArray* aArray, PRUint32 aIndex, nsresult* aErrorPtr = 0)
  63. {
  64. return nsQueryArrayElementAt(aArray, aIndex, aErrorPtr);
  65. }
  66. #endif // nsArrayUtils_h__