C++11 declares a type safe null pointer

content/common/sandbox_linux/sandbox_linux.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_SANDBOX_LINUX_SANDBOX_LINUX_H_
 #define CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_LINUX_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 55 matching lines @@
   // this returns what will actually happen once InitializeSandbox()
   // is called from inside these processes.
   int GetStatus();
   // Returns true if the current process is single-threaded or if the number
   // of threads cannot be determined.
   bool IsSingleThreaded() const;
   // Did we start Seccomp BPF?
   bool seccomp_bpf_started() const;
 
   // Simple accessor for our instance of the setuid sandbox. Will never return
-  // NULL.
+  // nullptr.
   // There is no StartSetuidSandbox(), the SetuidSandboxClient instance should
   // be used directly.
   sandbox::SetuidSandboxClient* setuid_sandbox_client() const;
 
   // Check the policy and eventually start the seccomp-bpf sandbox. This should
   // never be called with threads started. If we detect that threads have
   // started we will crash.
   bool StartSeccompBPF(const std::string& process_type);
 
   // Limit the address space of the current process (and its children).
@@ skipping 49 matching lines @@
     defined(LEAK_SANITIZER) || defined(UNDEFINED_SANITIZER)
   scoped_ptr<__sanitizer_sandbox_arguments> sanitizer_args_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(LinuxSandbox);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_LINUX_H_