gfx/src/ArrayView.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef MOZILLA_GFX_ARRAY_VIEW_H_
   7 #define MOZILLA_GFX_ARRAY_VIEW_H_
   8
   9 #include "nsTArray.h"
  10
  11 /* This is similar to mfbt/Range.h but has implicit conversion
  12  * from nsTArray and less bounds checking.
  13  * For now, prefer Range over ArrayView */
  14
  15 namespace mozilla {
  16 namespace gfx {
  17
  18 template <typename T>
  19 class ArrayView {
  20  public:
  21   MOZ_IMPLICIT ArrayView(const nsTArray<T>& aData)
  22       : mData(aData.Elements()), mLength(aData.Length()) {}
  23   ArrayView(const T* aData, const size_t aLength)
  24       : mData(aData), mLength(aLength) {}
  25   const T& operator[](const size_t aIdx) const { return mData[aIdx]; }
  26   size_t Length() const { return mLength; }
  27   const T* Data() const { return mData; }
  28
  29  private:
  30   const T* mData;
  31   const size_t mLength;
  32 };
  33
  34 }  // namespace gfx
  35 }  // namespace mozilla
  36
  37 #endif /* MOZILLA_GFX_ARRAY_VIEW_H_ */