C++11 declares a type safe null pointer

content/common/gpu/media/v4l2_video_device.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file defines the V4L2Device interface which is used by the
 // V4L2DecodeAccelerator class to delegate/pass the device specific
 // handling of any of the functionalities.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DEVICE_H_
 #define CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DEVICE_H_
@@ skipping 16 matching lines @@
 
   virtual ~V4L2Device();
 
   enum Type {
     kDecoder,
     kEncoder,
     kImageProcessor,
   };
 
   // Creates and initializes an appropriate V4L2Device of |type| for the
-  // current platform and returns a scoped_ptr<V4L2Device> on success, or NULL.
+  // current platform and returns a scoped_ptr<V4L2Device> on success,
+  // or nullptr.
   static scoped_ptr<V4L2Device> Create(Type type);
 
   // Parameters and return value are the same as for the standard ioctl() system
   // call.
   virtual int Ioctl(int request, void* arg) = 0;
 
   // This method sleeps until either:
   // - SetDevicePollInterrupt() is called (on another thread),
   // - |poll_device| is true, and there is new data to be read from the device,
   //   or an event from the device has arrived; in the latter case
@@ skipping 45 matching lines @@
   // Returns the preferred V4L2 input format or 0 if don't care.
   virtual uint32 PreferredInputFormat() = 0;
 
   // Returns the preferred V4L2 output format or 0 if don't care.
   virtual uint32 PreferredOutputFormat() = 0;
 };
 
 }  //  namespace content
 
 #endif  //  CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DEVICE_H_