c++ empty response async example

[윤석영]

Can I get example codes for c++ empty reponse in async mode

My current code occurs compile error. 

    

    struct AsyncClientCall {

        google.protobuf.Empty reply;

        ClientContext context;

        Status status;

        std::unique_ptr<ClientAsyncResponseReader<google.protobuf.Empty>> response_reader;

    };

In file included from ./src/CommGrpcService.cpp:1:0:

./hdr/CommGrpcService.h:28:9: error: 'google' does not name a type

         google.protobuf.Empty reply;

         ^

./hdr/CommGrpcService.h:31:67: error: template argument 1 is invalid

         std::unique_ptr<ClientAsyncResponseReader<google.protobuf.Empty>> response_reader;

                                                                   ^

./hdr/CommGrpcService.h:31:72: error: template argument 1 is invalid

         std::unique_ptr<ClientAsyncResponseReader<google.protobuf.Empty>> response_reader;

                                                                        ^

./hdr/CommGrpcService.h:31:72: error: template argument 2 is invalid

[Carl Mastrangelo]

Can you build the examples that come with gRPC? Your error looks like you might not have protobuf installed.