gfx/2d/StackArray.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 /* A handy class that will allocate data for size*T objects on the stack and
   8  * otherwise allocate them on the heap. It is similar in purpose to AutoTArray
   9  */
  10
  11 template <class T, size_t size>
  12 class StackArray final {
  13  public:
  14   explicit StackArray(size_t count) {
  15     if (count > size) {
  16       mData = new T[count];
  17     } else {
  18       mData = mStackData;
  19     }
  20   }
  21   ~StackArray() {
  22     if (mData != mStackData) {
  23       delete[] mData;
  24     }
  25   }
  26   T& operator[](size_t n) { return mData[n]; }
  27   const T& operator[](size_t n) const { return mData[n]; }
  28   T* data() { return mData; };
  29
  30  private:
  31   T mStackData[size];
  32   T* mData;
  33 };