C++11 declares a type safe null pointer

content/common/input/input_param_traits.cc

 // Copyright 2013 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.
 
 #include "content/common/input/input_param_traits.h"
 
 #include "content/common/content_param_traits.h"
 #include "content/common/input/synthetic_pinch_gesture_params.h"
 #include "content/common/input/synthetic_smooth_scroll_gesture_params.h"
 #include "content/common/input/web_input_event_traits.h"
@@ skipping 19 matching lines @@
   bool valid_web_event = !!p;
   WriteParam(m, valid_web_event);
   if (valid_web_event)
     WriteParam(m, static_cast<WebInputEventPointer>(p.get()));
 }
 
 bool ParamTraits<content::ScopedWebInputEvent>::Read(const Message* m,
                                                      PickleIterator* iter,
                                                      param_type* p) {
   bool valid_web_event = false;
-  WebInputEventPointer web_event_pointer = NULL;
+  WebInputEventPointer web_event_pointer = nullptr;
   if (!ReadParam(m, iter, &valid_web_event) ||
       !valid_web_event ||
       !ReadParam(m, iter, &web_event_pointer) ||
       !web_event_pointer)
     return false;
 
   (*p) = content::WebInputEventTraits::Clone(*web_event_pointer);
   return true;
 }
 
@@ skipping 41 matching lines @@
       break;
     case content::SyntheticGestureParams::TAP_GESTURE:
       gesture_params =
           ReadGestureParams<content::SyntheticTapGestureParams>(m, iter);
       break;
     default:
       return false;
   }
 
   p->set_gesture_params(gesture_params.Pass());
-  return p->gesture_params() != NULL;
+  return p->gesture_params() != nullptr;
 }
 
 void ParamTraits<content::SyntheticGesturePacket>::Log(const param_type& p,
                                                        std::string* l) {
   DCHECK(p.gesture_params());
   switch (p.gesture_params()->GetGestureType()) {
     case content::SyntheticGestureParams::SMOOTH_SCROLL_GESTURE:
       LogParam(
           *content::SyntheticSmoothScrollGestureParams::Cast(
               p.gesture_params()),
           l);
       break;
     case content::SyntheticGestureParams::PINCH_GESTURE:
       LogParam(
           *content::SyntheticPinchGestureParams::Cast(p.gesture_params()),
           l);
       break;
     case content::SyntheticGestureParams::TAP_GESTURE:
       LogParam(
           *content::SyntheticTapGestureParams::Cast(p.gesture_params()),
           l);
       break;
   }
 }
 
 }  // namespace IPC