michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsArrayUtils_h__
michael@0: #define nsArrayUtils_h__
michael@0: 
michael@0: #include "nsCOMPtr.h"
michael@0: #include "nsIArray.h"
michael@0: 
michael@0: // helper class for do_QueryElementAt
michael@0: class NS_COM_GLUE nsQueryArrayElementAt : public nsCOMPtr_helper
michael@0:   {
michael@0:     public:
michael@0:       nsQueryArrayElementAt(nsIArray* aArray, uint32_t aIndex,
michael@0:                             nsresult* aErrorPtr)
michael@0:           : mArray(aArray),
michael@0:             mIndex(aIndex),
michael@0:             mErrorPtr(aErrorPtr)
michael@0:         {
michael@0:           // nothing else to do here
michael@0:         }
michael@0: 
michael@0:       virtual nsresult NS_FASTCALL operator()(const nsIID& aIID, void**) const;
michael@0: 
michael@0:     private:
michael@0:       nsIArray*  mArray;
michael@0:       uint32_t   mIndex;
michael@0:       nsresult*  mErrorPtr;
michael@0:   };
michael@0: 
michael@0: inline
michael@0: const nsQueryArrayElementAt
michael@0: do_QueryElementAt(nsIArray* aArray, uint32_t aIndex, nsresult* aErrorPtr = 0)
michael@0:   {
michael@0:     return nsQueryArrayElementAt(aArray, aIndex, aErrorPtr);
michael@0:   }
michael@0: 
michael@0: #endif // nsArrayUtils_h__