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Minimal test - lines (14, 40)

Code

namespace mozilla {

/**
 * Save the current value of a variable and restore it when the object
 * goes out of scope.  For example:
 *   {
 *     AutoRestore savePainting(mIsPainting);
 *     mIsPainting = true;
 *
 *     // ... your code here ...
 *
 *     // mIsPainting is reset to its old value at the end of this block
 *   }
 */
template 
class MOZ_RAII AutoRestore {
 private:
  T& mLocation;
  T mValue;

 public:
  explicit AutoRestore(T& aValue) : mLocation(aValue), mValue(aValue) {}
  ~AutoRestore() { mLocation = mValue; }
  T SavedValue() const { return mValue; }
};

}  // namespace mozilla