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/gecko_api/include/nsIInterfaceRequestorUtils.h

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  1. /* -*- Mode: IDL; tab-width: 4; 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. *
  25. * Alternatively, the contents of this file may be used under the terms of
  26. * either of the GNU General Public License Version 2 or later (the "GPL"),
  27. * or 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 __nsInterfaceRequestorUtils_h
  39. #define __nsInterfaceRequestorUtils_h
  40. #include "nsCOMPtr.h"
  41. // a type-safe shortcut for calling the |GetInterface()| member function
  42. // T must inherit from nsIInterfaceRequestor, but the cast may be ambiguous.
  43. template <class T, class DestinationType>
  44. inline
  45. nsresult
  46. CallGetInterface( T* aSource, DestinationType** aDestination )
  47. {
  48. NS_PRECONDITION(aSource, "null parameter");
  49. NS_PRECONDITION(aDestination, "null parameter");
  50. return aSource->GetInterface(NS_GET_TEMPLATE_IID(DestinationType),
  51. reinterpret_cast<void**>(aDestination));
  52. }
  53. class NS_COM_GLUE nsGetInterface : public nsCOMPtr_helper
  54. {
  55. public:
  56. nsGetInterface( nsISupports* aSource, nsresult* error )
  57. : mSource(aSource),
  58. mErrorPtr(error)
  59. {
  60. // nothing else to do here
  61. }
  62. virtual nsresult NS_FASTCALL operator()( const nsIID&, void** ) const;
  63. private:
  64. nsISupports* mSource;
  65. nsresult* mErrorPtr;
  66. };
  67. inline
  68. const nsGetInterface
  69. do_GetInterface( nsISupports* aSource, nsresult* error = 0 )
  70. {
  71. return nsGetInterface(aSource, error);
  72. }
  73. #endif // __nsInterfaceRequestorUtils_h