nsArrayUtils.h - mozsearch

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsArrayUtils_h__

#define nsArrayUtils_h__

#include "nsCOMPtr.h"

#include "nsIArray.h"

// helper class for do_QueryElementAt

class MOZ_STACK_CLASS nsQueryArrayElementAt final : public nsCOMPtr_helper {

 public:

  nsQueryArrayElementAt(nsIArray* aArray, uint32_t aIndex, nsresult* aErrorPtr)

      : mArray(aArray), mIndex(aIndex), mErrorPtr(aErrorPtr) {}

  virtual nsresult NS_FASTCALL operator()(const nsIID& aIID,

                                          void**) const override;

 private:

  nsIArray* MOZ_NON_OWNING_REF mArray;

  uint32_t mIndex;

  nsresult* mErrorPtr;

};

inline const nsQueryArrayElementAt do_QueryElementAt(nsIArray* aArray,

                                                     uint32_t aIndex,

                                                     nsresult* aErrorPtr = 0) {

  return nsQueryArrayElementAt(aArray, aIndex, aErrorPtr);

#endif  // nsArrayUtils_h__