C++11 declares a type safe null pointer

content/common/gpu/client/gpu_video_decode_accelerator_host.cc

 // 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.
 
 #include "content/common/gpu/client/gpu_video_decode_accelerator_host.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/view_messages.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_message_utils.h"
 
 #if defined(OS_WIN)
 #include "content/public/common/sandbox_init.h"
 #endif  // OS_WIN
 
 using media::VideoDecodeAccelerator;
 namespace content {
 
 GpuVideoDecodeAcceleratorHost::GpuVideoDecodeAcceleratorHost(
     GpuChannelHost* channel,
     CommandBufferProxyImpl* impl)
     : channel_(channel),
       decoder_route_id_(MSG_ROUTING_NONE),
-      client_(NULL),
+      client_(nullptr),
       impl_(impl),
       weak_this_factory_(this) {
   DCHECK(channel_);
   DCHECK(impl_);
   impl_->AddDeletionObserver(this);
 }
 
 GpuVideoDecodeAcceleratorHost::~GpuVideoDecodeAcceleratorHost() {
   DCHECK(CalledOnValidThread());
 
@@ skipping 27 matching lines @@
   // See OnNotifyError for why |this| mustn't be used after OnNotifyError might
   // have been called above.
   return handled;
 }
 
 void GpuVideoDecodeAcceleratorHost::OnChannelError() {
   DCHECK(CalledOnValidThread());
   if (channel_) {
     if (decoder_route_id_ != MSG_ROUTING_NONE)
       channel_->RemoveRoute(decoder_route_id_);
-    channel_ = NULL;
+    channel_ = nullptr;
   }
   DLOG(ERROR) << "OnChannelError()";
   PostNotifyError(PLATFORM_FAILURE);
 }
 
 bool GpuVideoDecodeAcceleratorHost::Initialize(media::VideoCodecProfile profile,
                                                Client* client) {
   DCHECK(CalledOnValidThread());
   client_ = client;
 
@@ skipping 79 matching lines @@
   DCHECK(CalledOnValidThread());
   if (!channel_)
     return;
   Send(new AcceleratedVideoDecoderMsg_Reset(decoder_route_id_));
 }
 
 void GpuVideoDecodeAcceleratorHost::Destroy() {
   DCHECK(CalledOnValidThread());
   if (channel_)
     Send(new AcceleratedVideoDecoderMsg_Destroy(decoder_route_id_));
-  client_ = NULL;
+  client_ = nullptr;
   delete this;
 }
 
 void GpuVideoDecodeAcceleratorHost::OnWillDeleteImpl() {
   DCHECK(CalledOnValidThread());
-  impl_ = NULL;
+  impl_ = nullptr;
 
   // The CommandBufferProxyImpl is going away; error out this VDA.
   OnChannelError();
 }
 
 void GpuVideoDecodeAcceleratorHost::PostNotifyError(Error error) {
   DCHECK(CalledOnValidThread());
   DVLOG(2) << "PostNotifyError(): error=" << error;
   base::MessageLoopProxy::current()->PostTask(
       FROM_HERE,
@@ skipping 61 matching lines @@
 }
 
 void GpuVideoDecodeAcceleratorHost::OnNotifyError(uint32 error) {
   DCHECK(CalledOnValidThread());
   if (!client_)
     return;
   weak_this_factory_.InvalidateWeakPtrs();
 
   // Client::NotifyError() may Destroy() |this|, so calling it needs to be the
   // last thing done on this stack!
-  media::VideoDecodeAccelerator::Client* client = NULL;
+  media::VideoDecodeAccelerator::Client* client = nullptr;
   std::swap(client, client_);
   client->NotifyError(static_cast<media::VideoDecodeAccelerator::Error>(error));
 }
 
 }  // namespace content