Make it possible to compile with gcc4.6
diff --git a/include/grpc++/async_unary_call.h b/include/grpc++/async_unary_call.h
index b4a654c..ccd0806 100644
--- a/include/grpc++/async_unary_call.h
+++ b/include/grpc++/async_unary_call.h
@@ -45,7 +45,7 @@
 
 namespace grpc {
 template <class R>
-class ClientAsyncResponseReader final {
+class ClientAsyncResponseReader GRPC_FINAL {
  public:
   ClientAsyncResponseReader(ChannelInterface* channel, CompletionQueue* cq,
                     const RpcMethod& method, ClientContext* context,
@@ -79,7 +79,7 @@
 
 
  private:
-  ClientContext* context_ = nullptr;
+  ClientContext* context_;
   Call call_;
   CallOpBuffer init_buf_;
   CallOpBuffer meta_buf_;
@@ -87,7 +87,8 @@
 };
 
 template <class W>
-class ServerAsyncResponseWriter final : public ServerAsyncStreamingInterface {
+class ServerAsyncResponseWriter GRPC_FINAL
+    : public ServerAsyncStreamingInterface {
  public:
   explicit ServerAsyncResponseWriter(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
@@ -127,7 +128,7 @@
   }
 
  private:
-  void BindCall(Call* call) override { call_ = *call; }
+  void BindCall(Call* call) GRPC_OVERRIDE { call_ = *call; }
 
   Call call_;
   ServerContext* ctx_;
diff --git a/include/grpc++/client_context.h b/include/grpc++/client_context.h
index 1e7e6bf..c5a213e 100644
--- a/include/grpc++/client_context.h
+++ b/include/grpc++/client_context.h
@@ -139,7 +139,7 @@
     return authority_;
   }
 
-  bool initial_metadata_received_ = false;
+  bool initial_metadata_received_;
   grpc_call *call_;
   grpc_completion_queue *cq_;
   gpr_timespec absolute_deadline_;
diff --git a/include/grpc++/config.h b/include/grpc++/config.h
index 2dced12..323ea28 100644
--- a/include/grpc++/config.h
+++ b/include/grpc++/config.h
@@ -36,6 +36,14 @@
 
 #include <string>
 
+#ifdef GRPC_OLD_CXX
+#define GRPC_FINAL
+#define GRPC_OVERRIDE
+#else
+#define GRPC_FINAL final
+#define GRPC_OVERRIDE override
+#endif
+
 namespace grpc {
 
 typedef std::string string;
diff --git a/include/grpc++/credentials.h b/include/grpc++/credentials.h
index 5cbcca3..b75755d 100644
--- a/include/grpc++/credentials.h
+++ b/include/grpc++/credentials.h
@@ -47,7 +47,7 @@
 // to creating an instance using CredentialsFactory, and passing it down
 // during channel construction.
 
-class Credentials final {
+class Credentials GRPC_FINAL {
  public:
   ~Credentials();
 
diff --git a/include/grpc++/impl/call.h b/include/grpc++/impl/call.h
index 341710f..92ad0c7 100644
--- a/include/grpc++/impl/call.h
+++ b/include/grpc++/impl/call.h
@@ -35,6 +35,7 @@
 #define __GRPCPP_CALL_H__
 
 #include <grpc/grpc.h>
+#include <grpc++/config.h>
 #include <grpc++/status.h>
 #include <grpc++/completion_queue.h>
 
@@ -56,7 +57,7 @@
 
 class CallOpBuffer : public CompletionQueueTag {
  public:
-  CallOpBuffer() : return_tag_(this) {}
+  CallOpBuffer();
   ~CallOpBuffer();
 
   void Reset(void *next_return_tag);
@@ -80,40 +81,40 @@
   void FillOps(grpc_op *ops, size_t *nops);
 
   // Called by completion queue just prior to returning from Next() or Pluck()
-  bool FinalizeResult(void **tag, bool *status) override;
+  bool FinalizeResult(void **tag, bool *status) GRPC_OVERRIDE;
 
-  bool got_message = false;
+  bool got_message;
 
  private:
-  void *return_tag_ = nullptr;
+  void *return_tag_;
   // Send initial metadata
-  bool send_initial_metadata_ = false;
-  size_t initial_metadata_count_ = 0;
-  grpc_metadata *initial_metadata_ = nullptr;
+  bool send_initial_metadata_;
+  size_t initial_metadata_count_;
+  grpc_metadata *initial_metadata_;
   // Recv initial metadta
-  std::multimap<grpc::string, grpc::string> *recv_initial_metadata_ = nullptr;
-  grpc_metadata_array recv_initial_metadata_arr_ = {0, 0, nullptr};
+  std::multimap<grpc::string, grpc::string> *recv_initial_metadata_;
+  grpc_metadata_array recv_initial_metadata_arr_;
   // Send message
-  const google::protobuf::Message *send_message_ = nullptr;
-  grpc_byte_buffer *send_message_buf_ = nullptr;
+  const google::protobuf::Message *send_message_;
+  grpc_byte_buffer *send_message_buf_;
   // Recv message
-  google::protobuf::Message *recv_message_ = nullptr;
-  grpc_byte_buffer *recv_message_buf_ = nullptr;
+  google::protobuf::Message *recv_message_;
+  grpc_byte_buffer *recv_message_buf_;
   // Client send close
-  bool client_send_close_ = false;
+  bool client_send_close_;
   // Client recv status
-  std::multimap<grpc::string, grpc::string> *recv_trailing_metadata_ = nullptr;
-  Status *recv_status_ = nullptr;
-  grpc_metadata_array recv_trailing_metadata_arr_ = {0, 0, nullptr};
-  grpc_status_code status_code_ = GRPC_STATUS_OK;
-  char *status_details_ = nullptr;
-  size_t status_details_capacity_ = 0;
+  std::multimap<grpc::string, grpc::string> *recv_trailing_metadata_;
+  Status *recv_status_;
+  grpc_metadata_array recv_trailing_metadata_arr_;
+  grpc_status_code status_code_;
+  char *status_details_;
+  size_t status_details_capacity_;
   // Server send status
-  const Status *send_status_ = nullptr;
-  size_t trailing_metadata_count_ = 0;
-  grpc_metadata *trailing_metadata_ = nullptr;
+  const Status *send_status_;
+  size_t trailing_metadata_count_;
+  grpc_metadata *trailing_metadata_;
   int cancelled_buf_;
-  bool *recv_closed_ = nullptr;
+  bool *recv_closed_;
 };
 
 // Channel and Server implement this to allow them to hook performing ops
@@ -124,7 +125,7 @@
 };
 
 // Straightforward wrapping of the C call object
-class Call final {
+class Call GRPC_FINAL {
  public:
   /* call is owned by the caller */
   Call(grpc_call *call, CallHook *call_hook_, CompletionQueue *cq);
diff --git a/include/grpc++/impl/rpc_service_method.h b/include/grpc++/impl/rpc_service_method.h
index ffd5c34..a8794bc 100644
--- a/include/grpc++/impl/rpc_service_method.h
+++ b/include/grpc++/impl/rpc_service_method.h
@@ -77,7 +77,7 @@
       ServiceType* service)
       : func_(func), service_(service) {}
 
-  Status RunHandler(const HandlerParameter& param) final {
+  Status RunHandler(const HandlerParameter& param) GRPC_FINAL {
     // Invoke application function, cast proto messages to their actual types.
     return func_(service_, param.server_context,
                  dynamic_cast<const RequestType*>(param.request),
@@ -102,7 +102,7 @@
       ServiceType* service)
       : func_(func), service_(service) {}
 
-  Status RunHandler(const HandlerParameter& param) final {
+  Status RunHandler(const HandlerParameter& param) GRPC_FINAL {
     ServerReader<RequestType> reader(param.call, param.server_context);
     return func_(service_, param.server_context, &reader,
                  dynamic_cast<ResponseType*>(param.response));
@@ -124,7 +124,7 @@
       ServiceType* service)
       : func_(func), service_(service) {}
 
-  Status RunHandler(const HandlerParameter& param) final {
+  Status RunHandler(const HandlerParameter& param) GRPC_FINAL {
     ServerWriter<ResponseType> writer(param.call, param.server_context);
     return func_(service_, param.server_context,
                  dynamic_cast<const RequestType*>(param.request), &writer);
@@ -147,7 +147,7 @@
       ServiceType* service)
       : func_(func), service_(service) {}
 
-  Status RunHandler(const HandlerParameter& param) final {
+  Status RunHandler(const HandlerParameter& param) GRPC_FINAL {
     ServerReaderWriter<ResponseType, RequestType> stream(param.call,
                                                          param.server_context);
     return func_(service_, param.server_context, &stream);
diff --git a/include/grpc++/impl/service_type.h b/include/grpc++/impl/service_type.h
index cafa269..e54c3c2 100644
--- a/include/grpc++/impl/service_type.h
+++ b/include/grpc++/impl/service_type.h
@@ -79,7 +79,11 @@
 
   AsynchronousService(CompletionQueue* cq, const char** method_names,
                       size_t method_count)
-      : cq_(cq), method_names_(method_names), method_count_(method_count) {}
+      : cq_(cq),
+        dispatch_impl_(nullptr),
+        method_names_(method_names),
+        method_count_(method_count),
+        request_args_(nullptr) {}
 
   ~AsynchronousService() { delete[] request_args_; }
 
@@ -116,10 +120,10 @@
  private:
   friend class Server;
   CompletionQueue* const cq_;
-  DispatchImpl* dispatch_impl_ = nullptr;
+  DispatchImpl* dispatch_impl_;
   const char** const method_names_;
   size_t method_count_;
-  void** request_args_ = nullptr;
+  void** request_args_;
 };
 
 }  // namespace grpc
diff --git a/include/grpc++/server.h b/include/grpc++/server.h
index 429c0ff..46c4a62 100644
--- a/include/grpc++/server.h
+++ b/include/grpc++/server.h
@@ -61,8 +61,8 @@
 class ThreadPoolInterface;
 
 // Currently it only supports handling rpcs in a single thread.
-class Server final : private CallHook,
-                     private AsynchronousService::DispatchImpl {
+class Server GRPC_FINAL : private CallHook,
+                          private AsynchronousService::DispatchImpl {
  public:
   ~Server();
 
@@ -97,7 +97,7 @@
   void RunRpc();
   void ScheduleCallback();
 
-  void PerformOpsOnCall(CallOpBuffer* ops, Call* call) override;
+  void PerformOpsOnCall(CallOpBuffer* ops, Call* call) GRPC_OVERRIDE;
 
   // DispatchImpl
   void RequestAsyncCall(void* registered_method, ServerContext* context,
diff --git a/include/grpc++/server_builder.h b/include/grpc++/server_builder.h
index 4545c41..b672eb3 100644
--- a/include/grpc++/server_builder.h
+++ b/include/grpc++/server_builder.h
@@ -83,7 +83,7 @@
   std::vector<AsynchronousService*> async_services_;
   std::vector<grpc::string> ports_;
   std::shared_ptr<ServerCredentials> creds_;
-  ThreadPoolInterface* thread_pool_ = nullptr;
+  ThreadPoolInterface* thread_pool_;
 };
 
 }  // namespace grpc
diff --git a/include/grpc++/server_context.h b/include/grpc++/server_context.h
index d327d8b..6db767f 100644
--- a/include/grpc++/server_context.h
+++ b/include/grpc++/server_context.h
@@ -66,7 +66,7 @@
 class Server;
 
 // Interface of server side rpc context.
-class ServerContext final {
+class ServerContext GRPC_FINAL {
  public:
   ServerContext();  // for async calls
   ~ServerContext();
@@ -108,12 +108,12 @@
   ServerContext(gpr_timespec deadline, grpc_metadata* metadata,
                 size_t metadata_count);
 
-  CompletionOp* completion_op_ = nullptr;
+  CompletionOp* completion_op_;
 
   std::chrono::system_clock::time_point deadline_;
-  grpc_call* call_ = nullptr;
-  CompletionQueue* cq_ = nullptr;
-  bool sent_initial_metadata_ = false;
+  grpc_call* call_;
+  CompletionQueue* cq_;
+  bool sent_initial_metadata_;
   std::multimap<grpc::string, grpc::string> client_metadata_;
   std::multimap<grpc::string, grpc::string> initial_metadata_;
   std::multimap<grpc::string, grpc::string> trailing_metadata_;
diff --git a/include/grpc++/server_credentials.h b/include/grpc++/server_credentials.h
index 5c6787a..8af4159 100644
--- a/include/grpc++/server_credentials.h
+++ b/include/grpc++/server_credentials.h
@@ -44,7 +44,7 @@
 namespace grpc {
 
 // grpc_server_credentials wrapper class.
-class ServerCredentials final {
+class ServerCredentials GRPC_FINAL {
  public:
   ~ServerCredentials();
 
diff --git a/include/grpc++/stream.h b/include/grpc++/stream.h
index cd95ff7..8bcc75b 100644
--- a/include/grpc++/stream.h
+++ b/include/grpc++/stream.h
@@ -83,8 +83,8 @@
 };
 
 template <class R>
-class ClientReader final : public ClientStreamingInterface,
-                           public ReaderInterface<R> {
+class ClientReader GRPC_FINAL : public ClientStreamingInterface,
+                                public ReaderInterface<R> {
  public:
   // Blocking create a stream and write the first request out.
   ClientReader(ChannelInterface* channel, const RpcMethod& method,
@@ -111,7 +111,7 @@
     GPR_ASSERT(cq_.Pluck(&buf));
   }
 
-  virtual bool Read(R* msg) override {
+  virtual bool Read(R* msg) GRPC_OVERRIDE {
     CallOpBuffer buf;
     if (!context_->initial_metadata_received_) {
       buf.AddRecvInitialMetadata(context_);
@@ -121,7 +121,7 @@
     return cq_.Pluck(&buf) && buf.got_message;
   }
 
-  virtual Status Finish() override {
+  virtual Status Finish() GRPC_OVERRIDE {
     CallOpBuffer buf;
     Status status;
     buf.AddClientRecvStatus(context_, &status);
@@ -137,8 +137,8 @@
 };
 
 template <class W>
-class ClientWriter final : public ClientStreamingInterface,
-                           public WriterInterface<W> {
+class ClientWriter GRPC_FINAL : public ClientStreamingInterface,
+                                public WriterInterface<W> {
  public:
   // Blocking create a stream.
   ClientWriter(ChannelInterface* channel, const RpcMethod& method,
@@ -152,7 +152,7 @@
     cq_.Pluck(&buf);
   }
 
-  virtual bool Write(const W& msg) override {
+  virtual bool Write(const W& msg) GRPC_OVERRIDE {
     CallOpBuffer buf;
     buf.AddSendMessage(msg);
     call_.PerformOps(&buf);
@@ -167,7 +167,7 @@
   }
 
   // Read the final response and wait for the final status.
-  virtual Status Finish() override {
+  virtual Status Finish() GRPC_OVERRIDE {
     CallOpBuffer buf;
     Status status;
     buf.AddRecvMessage(response_);
@@ -186,9 +186,9 @@
 
 // Client-side interface for bi-directional streaming.
 template <class W, class R>
-class ClientReaderWriter final : public ClientStreamingInterface,
-                                 public WriterInterface<W>,
-                                 public ReaderInterface<R> {
+class ClientReaderWriter GRPC_FINAL : public ClientStreamingInterface,
+                                      public WriterInterface<W>,
+                                      public ReaderInterface<R> {
  public:
   // Blocking create a stream.
   ClientReaderWriter(ChannelInterface* channel, const RpcMethod& method,
@@ -213,7 +213,7 @@
     GPR_ASSERT(cq_.Pluck(&buf));
   }
 
-  virtual bool Read(R* msg) override {
+  virtual bool Read(R* msg) GRPC_OVERRIDE {
     CallOpBuffer buf;
     if (!context_->initial_metadata_received_) {
       buf.AddRecvInitialMetadata(context_);
@@ -223,7 +223,7 @@
     return cq_.Pluck(&buf) && buf.got_message;
   }
 
-  virtual bool Write(const W& msg) override {
+  virtual bool Write(const W& msg) GRPC_OVERRIDE {
     CallOpBuffer buf;
     buf.AddSendMessage(msg);
     call_.PerformOps(&buf);
@@ -237,7 +237,7 @@
     return cq_.Pluck(&buf);
   }
 
-  virtual Status Finish() override {
+  virtual Status Finish() GRPC_OVERRIDE {
     CallOpBuffer buf;
     Status status;
     buf.AddClientRecvStatus(context_, &status);
@@ -253,7 +253,7 @@
 };
 
 template <class R>
-class ServerReader final : public ReaderInterface<R> {
+class ServerReader GRPC_FINAL : public ReaderInterface<R> {
  public:
   ServerReader(Call* call, ServerContext* ctx) : call_(call), ctx_(ctx) {}
 
@@ -267,7 +267,7 @@
     call_->cq()->Pluck(&buf);
   }
 
-  virtual bool Read(R* msg) override {
+  virtual bool Read(R* msg) GRPC_OVERRIDE {
     CallOpBuffer buf;
     buf.AddRecvMessage(msg);
     call_->PerformOps(&buf);
@@ -280,7 +280,7 @@
 };
 
 template <class W>
-class ServerWriter final : public WriterInterface<W> {
+class ServerWriter GRPC_FINAL : public WriterInterface<W> {
  public:
   ServerWriter(Call* call, ServerContext* ctx) : call_(call), ctx_(ctx) {}
 
@@ -294,7 +294,7 @@
     call_->cq()->Pluck(&buf);
   }
 
-  virtual bool Write(const W& msg) override {
+  virtual bool Write(const W& msg) GRPC_OVERRIDE {
     CallOpBuffer buf;
     if (!ctx_->sent_initial_metadata_) {
       buf.AddSendInitialMetadata(&ctx_->initial_metadata_);
@@ -312,8 +312,8 @@
 
 // Server-side interface for bi-directional streaming.
 template <class W, class R>
-class ServerReaderWriter final : public WriterInterface<W>,
-                                 public ReaderInterface<R> {
+class ServerReaderWriter GRPC_FINAL : public WriterInterface<W>,
+                                      public ReaderInterface<R> {
  public:
   ServerReaderWriter(Call* call, ServerContext* ctx) : call_(call), ctx_(ctx) {}
 
@@ -327,14 +327,14 @@
     call_->cq()->Pluck(&buf);
   }
 
-  virtual bool Read(R* msg) override {
+  virtual bool Read(R* msg) GRPC_OVERRIDE {
     CallOpBuffer buf;
     buf.AddRecvMessage(msg);
     call_->PerformOps(&buf);
     return call_->cq()->Pluck(&buf) && buf.got_message;
   }
 
-  virtual bool Write(const W& msg) override {
+  virtual bool Write(const W& msg) GRPC_OVERRIDE {
     CallOpBuffer buf;
     if (!ctx_->sent_initial_metadata_) {
       buf.AddSendInitialMetadata(&ctx_->initial_metadata_);
@@ -380,8 +380,8 @@
 };
 
 template <class R>
-class ClientAsyncReader final : public ClientAsyncStreamingInterface,
-                                public AsyncReaderInterface<R> {
+class ClientAsyncReader GRPC_FINAL : public ClientAsyncStreamingInterface,
+                                     public AsyncReaderInterface<R> {
  public:
   // Create a stream and write the first request out.
   ClientAsyncReader(ChannelInterface* channel, CompletionQueue* cq,
@@ -395,7 +395,7 @@
     call_.PerformOps(&init_buf_);
   }
 
-  void ReadInitialMetadata(void* tag) override {
+  void ReadInitialMetadata(void* tag) GRPC_OVERRIDE {
     GPR_ASSERT(!context_->initial_metadata_received_);
 
     meta_buf_.Reset(tag);
@@ -403,7 +403,7 @@
     call_.PerformOps(&meta_buf_);
   }
 
-  void Read(R* msg, void* tag) override {
+  void Read(R* msg, void* tag) GRPC_OVERRIDE {
     read_buf_.Reset(tag);
     if (!context_->initial_metadata_received_) {
       read_buf_.AddRecvInitialMetadata(context_);
@@ -412,7 +412,7 @@
     call_.PerformOps(&read_buf_);
   }
 
-  void Finish(Status* status, void* tag) override {
+  void Finish(Status* status, void* tag) GRPC_OVERRIDE {
     finish_buf_.Reset(tag);
     if (!context_->initial_metadata_received_) {
       finish_buf_.AddRecvInitialMetadata(context_);
@@ -422,7 +422,7 @@
   }
 
  private:
-  ClientContext* context_ = nullptr;
+  ClientContext* context_;
   Call call_;
   CallOpBuffer init_buf_;
   CallOpBuffer meta_buf_;
@@ -431,8 +431,8 @@
 };
 
 template <class W>
-class ClientAsyncWriter final : public ClientAsyncStreamingInterface,
-                                public AsyncWriterInterface<W> {
+class ClientAsyncWriter GRPC_FINAL : public ClientAsyncStreamingInterface,
+                                     public AsyncWriterInterface<W> {
  public:
   ClientAsyncWriter(ChannelInterface* channel, CompletionQueue* cq,
                     const RpcMethod& method, ClientContext* context,
@@ -445,7 +445,7 @@
     call_.PerformOps(&init_buf_);
   }
 
-  void ReadInitialMetadata(void* tag) override {
+  void ReadInitialMetadata(void* tag) GRPC_OVERRIDE {
     GPR_ASSERT(!context_->initial_metadata_received_);
 
     meta_buf_.Reset(tag);
@@ -453,7 +453,7 @@
     call_.PerformOps(&meta_buf_);
   }
 
-  void Write(const W& msg, void* tag) override {
+  void Write(const W& msg, void* tag) GRPC_OVERRIDE {
     write_buf_.Reset(tag);
     write_buf_.AddSendMessage(msg);
     call_.PerformOps(&write_buf_);
@@ -465,7 +465,7 @@
     call_.PerformOps(&writes_done_buf_);
   }
 
-  void Finish(Status* status, void* tag) override {
+  void Finish(Status* status, void* tag) GRPC_OVERRIDE {
     finish_buf_.Reset(tag);
     if (!context_->initial_metadata_received_) {
       finish_buf_.AddRecvInitialMetadata(context_);
@@ -476,7 +476,7 @@
   }
 
  private:
-  ClientContext* context_ = nullptr;
+  ClientContext* context_;
   google::protobuf::Message* const response_;
   Call call_;
   CallOpBuffer init_buf_;
@@ -488,9 +488,9 @@
 
 // Client-side interface for bi-directional streaming.
 template <class W, class R>
-class ClientAsyncReaderWriter final : public ClientAsyncStreamingInterface,
-                                      public AsyncWriterInterface<W>,
-                                      public AsyncReaderInterface<R> {
+class ClientAsyncReaderWriter GRPC_FINAL : public ClientAsyncStreamingInterface,
+                                           public AsyncWriterInterface<W>,
+                                           public AsyncReaderInterface<R> {
  public:
   ClientAsyncReaderWriter(ChannelInterface* channel, CompletionQueue* cq,
                           const RpcMethod& method, ClientContext* context,
@@ -501,7 +501,7 @@
     call_.PerformOps(&init_buf_);
   }
 
-  void ReadInitialMetadata(void* tag) override {
+  void ReadInitialMetadata(void* tag) GRPC_OVERRIDE {
     GPR_ASSERT(!context_->initial_metadata_received_);
 
     meta_buf_.Reset(tag);
@@ -509,7 +509,7 @@
     call_.PerformOps(&meta_buf_);
   }
 
-  void Read(R* msg, void* tag) override {
+  void Read(R* msg, void* tag) GRPC_OVERRIDE {
     read_buf_.Reset(tag);
     if (!context_->initial_metadata_received_) {
       read_buf_.AddRecvInitialMetadata(context_);
@@ -518,7 +518,7 @@
     call_.PerformOps(&read_buf_);
   }
 
-  void Write(const W& msg, void* tag) override {
+  void Write(const W& msg, void* tag) GRPC_OVERRIDE {
     write_buf_.Reset(tag);
     write_buf_.AddSendMessage(msg);
     call_.PerformOps(&write_buf_);
@@ -530,7 +530,7 @@
     call_.PerformOps(&writes_done_buf_);
   }
 
-  void Finish(Status* status, void* tag) override {
+  void Finish(Status* status, void* tag) GRPC_OVERRIDE {
     finish_buf_.Reset(tag);
     if (!context_->initial_metadata_received_) {
       finish_buf_.AddRecvInitialMetadata(context_);
@@ -540,7 +540,7 @@
   }
 
  private:
-  ClientContext* context_ = nullptr;
+  ClientContext* context_;
   Call call_;
   CallOpBuffer init_buf_;
   CallOpBuffer meta_buf_;
@@ -551,13 +551,13 @@
 };
 
 template <class W, class R>
-class ServerAsyncReader : public ServerAsyncStreamingInterface,
-                          public AsyncReaderInterface<R> {
+class ServerAsyncReader GRPC_FINAL : public ServerAsyncStreamingInterface,
+                                     public AsyncReaderInterface<R> {
  public:
   explicit ServerAsyncReader(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
 
-  void SendInitialMetadata(void* tag) override {
+  void SendInitialMetadata(void* tag) GRPC_OVERRIDE {
     GPR_ASSERT(!ctx_->sent_initial_metadata_);
 
     meta_buf_.Reset(tag);
@@ -566,7 +566,7 @@
     call_.PerformOps(&meta_buf_);
   }
 
-  void Read(R* msg, void* tag) override {
+  void Read(R* msg, void* tag) GRPC_OVERRIDE {
     read_buf_.Reset(tag);
     read_buf_.AddRecvMessage(msg);
     call_.PerformOps(&read_buf_);
@@ -598,7 +598,7 @@
   }
 
  private:
-  void BindCall(Call* call) override { call_ = *call; }
+  void BindCall(Call* call) GRPC_OVERRIDE { call_ = *call; }
 
   Call call_;
   ServerContext* ctx_;
@@ -608,13 +608,13 @@
 };
 
 template <class W>
-class ServerAsyncWriter : public ServerAsyncStreamingInterface,
-                          public AsyncWriterInterface<W> {
+class ServerAsyncWriter GRPC_FINAL : public ServerAsyncStreamingInterface,
+                                     public AsyncWriterInterface<W> {
  public:
   explicit ServerAsyncWriter(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
 
-  void SendInitialMetadata(void* tag) override {
+  void SendInitialMetadata(void* tag) GRPC_OVERRIDE {
     GPR_ASSERT(!ctx_->sent_initial_metadata_);
 
     meta_buf_.Reset(tag);
@@ -623,7 +623,7 @@
     call_.PerformOps(&meta_buf_);
   }
 
-  void Write(const W& msg, void* tag) override {
+  void Write(const W& msg, void* tag) GRPC_OVERRIDE {
     write_buf_.Reset(tag);
     if (!ctx_->sent_initial_metadata_) {
       write_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
@@ -644,7 +644,7 @@
   }
 
  private:
-  void BindCall(Call* call) override { call_ = *call; }
+  void BindCall(Call* call) GRPC_OVERRIDE { call_ = *call; }
 
   Call call_;
   ServerContext* ctx_;
@@ -655,14 +655,14 @@
 
 // Server-side interface for bi-directional streaming.
 template <class W, class R>
-class ServerAsyncReaderWriter : public ServerAsyncStreamingInterface,
-                                public AsyncWriterInterface<W>,
-                                public AsyncReaderInterface<R> {
+class ServerAsyncReaderWriter GRPC_FINAL : public ServerAsyncStreamingInterface,
+                                           public AsyncWriterInterface<W>,
+                                           public AsyncReaderInterface<R> {
  public:
   explicit ServerAsyncReaderWriter(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
 
-  void SendInitialMetadata(void* tag) override {
+  void SendInitialMetadata(void* tag) GRPC_OVERRIDE {
     GPR_ASSERT(!ctx_->sent_initial_metadata_);
 
     meta_buf_.Reset(tag);
@@ -671,13 +671,13 @@
     call_.PerformOps(&meta_buf_);
   }
 
-  virtual void Read(R* msg, void* tag) override {
+  virtual void Read(R* msg, void* tag) GRPC_OVERRIDE {
     read_buf_.Reset(tag);
     read_buf_.AddRecvMessage(msg);
     call_.PerformOps(&read_buf_);
   }
 
-  virtual void Write(const W& msg, void* tag) override {
+  virtual void Write(const W& msg, void* tag) GRPC_OVERRIDE {
     write_buf_.Reset(tag);
     if (!ctx_->sent_initial_metadata_) {
       write_buf_.AddSendInitialMetadata(&ctx_->initial_metadata_);
@@ -698,7 +698,7 @@
   }
 
  private:
-  void BindCall(Call* call) override { call_ = *call; }
+  void BindCall(Call* call) GRPC_OVERRIDE { call_ = *call; }
 
   Call call_;
   ServerContext* ctx_;