Client Initialization. 

std::shared_ptr<grpc.Channel> channel = grpc.CreateChannel (
    "localhost:8888", grpc.InsecureChannelCredentials ());

Single Argument Method Call. 

grpc.ClientContext context;
AnExampleResponse response;
std::shared_ptr<AnExampleService::Stub> stub = AnExampleService::NewStub (channel);
grpc.Status status = stub->OneToOne (&context, request, &response);
if (status.ok ()) {

    // Response available here ...

}