Fix server side and generic stub

include/grpc++/impl/rpc_method.h

@@ -49,6 +49,9 @@ class RpcMethod {
     BIDI_STREAMING
   };
 
+  RpcMethod(const char* name, RpcType type)
+      : name_(name), method_type_(type), channel_tag_(NULL) {}
+
   RpcMethod(const char* name, RpcType type,
             const std::shared_ptr<Channel>& channel)
       : name_(name),

include/grpc++/impl/rpc_service_method.h

@@ -229,7 +229,7 @@ class RpcServiceMethod : public RpcMethod {
   // Takes ownership of the handler
   RpcServiceMethod(const char* name, RpcMethod::RpcType type,
                    MethodHandler* handler)
-      : RpcMethod(name, type, nullptr), handler_(handler) {}
+      : RpcMethod(name, type), handler_(handler) {}
 
   MethodHandler* handler() { return handler_.get(); }
 

src/cpp/client/generic_stub.cc

@@ -44,8 +44,7 @@ std::unique_ptr<GenericClientAsyncReaderWriter> GenericStub::Call(
   return std::unique_ptr<GenericClientAsyncReaderWriter>(
       new GenericClientAsyncReaderWriter(
           channel_.get(), cq,
-          RpcMethod(method.c_str(), RpcMethod::BIDI_STREAMING, nullptr),
+          RpcMethod(method.c_str(), RpcMethod::BIDI_STREAMING), context, tag));
-          context, tag));
 }
 
 }  // namespace grpc