C++11 declares a type safe null pointer

content/common/gpu/client/command_buffer_proxy_impl.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/command_buffer_proxy_impl.h"
 
 #include "base/callback.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/shared_memory.h"
@@ skipping 44 matching lines @@
   DCHECK(handled);
   return handled;
 }
 
 void CommandBufferProxyImpl::OnChannelError() {
   OnDestroyed(gpu::error::kUnknown);
 }
 
 void CommandBufferProxyImpl::OnDestroyed(gpu::error::ContextLostReason reason) {
   // Prevent any further messages from being sent.
-  channel_ = NULL;
+  channel_ = nullptr;
 
   // When the client sees that the context is lost, they should delete this
   // CommandBufferProxyImpl and create a new one.
   last_state_.error = gpu::error::kLostContext;
   last_state_.context_lost_reason = reason;
 
   if (!channel_error_callback_.is_null()) {
     channel_error_callback_.Run();
     // Avoid calling the error callback more than once.
     channel_error_callback_.Reset();
@@ skipping 168 matching lines @@
   Send(new GpuCommandBufferMsg_SetGetBuffer(route_id_, shm_id));
   last_put_offset_ = -1;
 }
 
 scoped_refptr<gpu::Buffer> CommandBufferProxyImpl::CreateTransferBuffer(
     size_t size,
     int32* id) {
   *id = -1;
 
   if (last_state_.error != gpu::error::kNoError)
-    return NULL;
+    return nullptr;
 
   int32 new_id = channel_->ReserveTransferBufferId();
 
   scoped_ptr<base::SharedMemory> shared_memory(
       channel_->factory()->AllocateSharedMemory(size));
   if (!shared_memory)
-    return NULL;
+    return nullptr;
 
   DCHECK(!shared_memory->memory());
   if (!shared_memory->Map(size))
-    return NULL;
+    return nullptr;
 
   // This handle is owned by the GPU process and must be passed to it or it
   // will leak. In otherwords, do not early out on error between here and the
   // sending of the RegisterTransferBuffer IPC below.
   base::SharedMemoryHandle handle =
       channel_->ShareToGpuProcess(shared_memory->handle());
   if (!base::SharedMemory::IsHandleValid(handle))
-    return NULL;
+    return nullptr;
 
   if (!Send(new GpuCommandBufferMsg_RegisterTransferBuffer(route_id_,
                                                            new_id,
                                                            handle,
                                                            size))) {
-    return NULL;
+    return nullptr;
   }
 
   *id = new_id;
   scoped_refptr<gpu::Buffer> buffer(
       gpu::MakeBufferFromSharedMemory(shared_memory.Pass(), size));
   return buffer;
 }
 
 void CommandBufferProxyImpl::DestroyTransferBuffer(int32 id) {
   if (last_state_.error != gpu::error::kNoError)
     return;
 
   Send(new GpuCommandBufferMsg_DestroyTransferBuffer(route_id_, id));
 }
 
 gpu::Capabilities CommandBufferProxyImpl::GetCapabilities() {
   return capabilities_;
 }
 
 gfx::GpuMemoryBuffer* CommandBufferProxyImpl::CreateGpuMemoryBuffer(
     size_t width,
     size_t height,
     unsigned internalformat,
     unsigned usage,
     int32* id) {
   *id = -1;
 
   if (last_state_.error != gpu::error::kNoError)
-    return NULL;
+    return nullptr;
 
   scoped_ptr<gfx::GpuMemoryBuffer> buffer(
       channel_->factory()->AllocateGpuMemoryBuffer(
           width, height, internalformat, usage));
   if (!buffer)
-    return NULL;
+    return nullptr;
 
   DCHECK(GpuChannelHost::IsValidGpuMemoryBuffer(buffer->GetHandle()));
 
   int32 new_id = channel_->ReserveGpuMemoryBufferId();
 
   // This handle is owned by the GPU process and must be passed to it or it
   // will leak. In otherwords, do not early out on error between here and the
   // sending of the RegisterGpuMemoryBuffer IPC below.
   gfx::GpuMemoryBufferHandle handle =
       channel_->ShareGpuMemoryBufferToGpuProcess(buffer->GetHandle());
 
   if (!Send(new GpuCommandBufferMsg_RegisterGpuMemoryBuffer(
                 route_id_,
                 new_id,
                 handle,
                 width,
                 height,
                 internalformat))) {
-    return NULL;
+    return nullptr;
   }
 
   *id = new_id;
   DCHECK(gpu_memory_buffers_.find(new_id) == gpu_memory_buffers_.end());
   return gpu_memory_buffers_.add(new_id, buffer.Pass()).first->second;
 }
 
 void CommandBufferProxyImpl::DestroyGpuMemoryBuffer(int32 id) {
   if (last_state_.error != gpu::error::kNoError)
     return;
@@ skipping 173 matching lines @@
     if (!ui::LatencyInfo::Verify(
             latency_info, "CommandBufferProxyImpl::OnSwapBuffersCompleted")) {
       swap_buffers_completion_callback_.Run(std::vector<ui::LatencyInfo>());
       return;
     }
     swap_buffers_completion_callback_.Run(latency_info);
   }
 }
 
 }  // namespace content