Line data    Source code

       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             : {
      21             :     public:
      22        1251 :         MOZ_IMPLICIT ArrayView(const nsTArray<T>& aData) :
      23        1251 :             mData(aData.Elements()), mLength(aData.Length())
      24             :         {
      25        1251 :         }
      26             :         ArrayView(const T* aData, const size_t aLength) :
      27             :             mData(aData), mLength(aLength)
      28             :         {
      29             :         }
      30             :         const T& operator[](const size_t aIdx) const
      31             :         {
      32             :             return mData[aIdx];
      33             :         }
      34        1251 :         size_t Length() const
      35             :         {
      36        1251 :             return mLength;
      37             :         }
      38        1251 :         const T* Data() const
      39             :         {
      40        1251 :             return mData;
      41             :         }
      42             :     private:
      43             :         const T* mData;
      44             :         const size_t mLength;
      45             : };
      46             : 
      47             : } // namespace gfx
      48             : } // namespace mozilla
      49             : 
      50             : #endif /* MOZILLA_GFX_ARRAY_VIEW_H_ */