xpcom/ds/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 MOZ_STACK_CLASS nsQueryArrayElementAt final : public nsCOMPtr_helper {
  15  public:
  16   nsQueryArrayElementAt(nsIArray* aArray, uint32_t aIndex, nsresult* aErrorPtr)
  17       : mArray(aArray), mIndex(aIndex), mErrorPtr(aErrorPtr) {}
  18
  19   virtual nsresult NS_FASTCALL operator()(const nsIID& aIID,
  20                                           void**) const override;
  21
  22  private:
  23   nsIArray* MOZ_NON_OWNING_REF mArray;
  24   uint32_t mIndex;
  25   nsresult* mErrorPtr;
  26 };
  27
  28 inline const nsQueryArrayElementAt do_QueryElementAt(nsIArray* aArray,
  29                                                      uint32_t aIndex,
  30                                                      nsresult* aErrorPtr = 0) {
  31   return nsQueryArrayElementAt(aArray, aIndex, aErrorPtr);
  32 }
  33
  34 #endif  // nsArrayUtils_h__