Replace NULL with nullptr or null in webrtc/base/.

webrtc/base/socketstream.cc

 /*
  *  Copyright 2010 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/base/socketstream.h"
 
 #include "webrtc/base/checks.h"
 
 namespace rtc {
 
-SocketStream::SocketStream(AsyncSocket* socket) : socket_(NULL) {
+SocketStream::SocketStream(AsyncSocket* socket) : socket_(nullptr) {
   Attach(socket);
 }
 
 SocketStream::~SocketStream() {
   delete socket_;
 }
 
 void SocketStream::Attach(AsyncSocket* socket) {
   if (socket_)
     delete socket_;
   socket_ = socket;
   if (socket_) {
     socket_->SignalConnectEvent.connect(this, &SocketStream::OnConnectEvent);
     socket_->SignalReadEvent.connect(this,    &SocketStream::OnReadEvent);
     socket_->SignalWriteEvent.connect(this,   &SocketStream::OnWriteEvent);
     socket_->SignalCloseEvent.connect(this,   &SocketStream::OnCloseEvent);
   }
 }
 
 AsyncSocket* SocketStream::Detach() {
   AsyncSocket* socket = socket_;
   if (socket_) {
     socket_->SignalConnectEvent.disconnect(this);
     socket_->SignalReadEvent.disconnect(this);
     socket_->SignalWriteEvent.disconnect(this);
     socket_->SignalCloseEvent.disconnect(this);
-    socket_ = NULL;
+    socket_ = nullptr;
   }
   return socket;
 }
 
 StreamState SocketStream::GetState() const {
-  RTC_DCHECK(socket_ != NULL);
+  RTC_DCHECK(socket_ != nullptr);
   switch (socket_->GetState()) {
     case Socket::CS_CONNECTED:
       return SS_OPEN;
     case Socket::CS_CONNECTING:
       return SS_OPENING;
     case Socket::CS_CLOSED:
     default:
       return SS_CLOSED;
   }
 }
 
 StreamResult SocketStream::Read(void* buffer, size_t buffer_len,
                                 size_t* read, int* error) {
-  RTC_DCHECK(socket_ != NULL);
+  RTC_DCHECK(socket_ != nullptr);
   int result = socket_->Recv(buffer, buffer_len, nullptr);
   if (result < 0) {
     if (socket_->IsBlocking())
       return SR_BLOCK;
     if (error)
       *error = socket_->GetError();
     return SR_ERROR;
   }
   if ((result > 0) || (buffer_len == 0)) {
     if (read)
       *read = result;
     return SR_SUCCESS;
   }
   return SR_EOS;
 }
 
 StreamResult SocketStream::Write(const void* data, size_t data_len,
                                  size_t* written, int* error) {
-  RTC_DCHECK(socket_ != NULL);
+  RTC_DCHECK(socket_ != nullptr);
   int result = socket_->Send(data, data_len);
   if (result < 0) {
     if (socket_->IsBlocking())
       return SR_BLOCK;
     if (error)
       *error = socket_->GetError();
     return SR_ERROR;
   }
   if (written)
     *written = result;
   return SR_SUCCESS;
 }
 
 void SocketStream::Close() {
-  RTC_DCHECK(socket_ != NULL);
+  RTC_DCHECK(socket_ != nullptr);
   socket_->Close();
 }
 
 void SocketStream::OnConnectEvent(AsyncSocket* socket) {
   RTC_DCHECK(socket == socket_);
   SignalEvent(this, SE_OPEN | SE_READ | SE_WRITE, 0);
 }
 
 void SocketStream::OnReadEvent(AsyncSocket* socket) {
   RTC_DCHECK(socket == socket_);
   SignalEvent(this, SE_READ, 0);
 }
 
 void SocketStream::OnWriteEvent(AsyncSocket* socket) {
   RTC_DCHECK(socket == socket_);
   SignalEvent(this, SE_WRITE, 0);
 }
 
 void SocketStream::OnCloseEvent(AsyncSocket* socket, int err) {
   RTC_DCHECK(socket == socket_);
   SignalEvent(this, SE_CLOSE, err);
 }
 
 
 }  // namespace rtc