C++11 declares a type safe null pointer

content/common/media/media_stream_options.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_COMMON_MEDIA_MEDIA_STREAM_OPTIONS_H_
 #define CONTENT_COMMON_MEDIA_MEDIA_STREAM_OPTIONS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 44 matching lines @@
   Constraints mandatory_audio;
   Constraints optional_audio;
 
   bool video_requested;
   Constraints mandatory_video;
   Constraints optional_video;
 
   // Fetches |value| from the first audio constraint with a name that matches
   // |name| from |mandatory_audio| and |optional_audio|. First mandatory
   // constraints are searched, then optional.
-  // |is_mandatory| may be NULL but if it is provided, it is set
+  // |is_mandatory| may be nullptr but if it is provided, it is set
   // to true if the found constraint is mandatory.
   // Returns false if no constraint is found.
   bool GetFirstAudioConstraintByName(const std::string& name,
                                      std::string* value,
                                      bool* is_mandatory) const;
 
   // Fetches |value| from the first video constraint with a name that matches
   // |name| from |mandatory_video| and |optional_video|. First mandatory
   // constraints are searched, then optional.
-  // |is_mandatory| may be NULL but if it is provided, it is set
+  // |is_mandatory| may be nullptr but if it is provided, it is set
   // to true if the found constraint is mandatory.
   // Returns false if no constraint is found.
   bool GetFirstVideoConstraintByName(const std::string& name,
                                      std::string* value,
                                      bool* is_mandatory) const;
 
   // Fetches |values| from all constraint with a name that matches |name|
   // from |constraints|.
   static void GetConstraintsByName(
       const StreamOptions::Constraints& constraints,
@@ skipping 22 matching lines @@
 
   // Id for this capture session. Unique for all sessions of the same type.
   int session_id;
 };
 
 typedef std::vector<StreamDeviceInfo> StreamDeviceInfoArray;
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_MEDIA_MEDIA_STREAM_OPTIONS_H_