xpcom/glue/nsArrayUtils.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsArrayUtils_h__
   8 #define nsArrayUtils_h__
   9
  10 #include "nsCOMPtr.h"
  11 #include "nsIArray.h"
  12
  13 // helper class for do_QueryElementAt
  14 class nsQueryArrayElementAt : public nsCOMPtr_helper
  15 {
  16 public:
  17   nsQueryArrayElementAt(nsIArray* aArray, uint32_t aIndex,
  18                         nsresult* aErrorPtr)
  19     : mArray(aArray)
  20     , mIndex(aIndex)
  21     , mErrorPtr(aErrorPtr)
  22   {
  23   }
  24
  25   virtual nsresult NS_FASTCALL operator()(const nsIID& aIID, void**) const;
  26
  27 private:
  28   nsIArray*  mArray;
  29   uint32_t   mIndex;
  30   nsresult*  mErrorPtr;
  31 };
  32
  33 inline const nsQueryArrayElementAt
  34 do_QueryElementAt(nsIArray* aArray, uint32_t aIndex, nsresult* aErrorPtr = 0)
  35 {
  36   return nsQueryArrayElementAt(aArray, aIndex, aErrorPtr);
  37 }
  38
  39 #endif // nsArrayUtils_h__