grpc proto文件生成到c++问题

#include <iostream>
#include <memory>
#include <string>

#include <grpcpp/grpcpp.h>
#include "greeter.grpc.pb.h"

using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;
using example::Greeter;
using example::HelloReply;
using example::HelloRequest;

class GreeterServiceImpl final : public Greeter::Service {
    Status SayHello(ServerContext* context, const HelloRequest* request, HelloReply* reply) override {
        std::string prefix("Hello ");
        reply->set_message(prefix + request->name());
        return Status::OK;
    }
};

void RunServer() {
    std::string server_address("0.0.0.0:50051");
    GreeterServiceImpl service;

    ServerBuilder builder;
    builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
    builder.RegisterService(&service);
    std::unique_ptr<Server> server(builder.BuildAndStart());
    std::cout << "Server listening on " << server_address << std::endl;

    server->Wait();
}

int main(int argc, char** argv) {
    RunServer();
    return 0;
}

#include <iostream>
#include <memory>
#include <string>

#include <grpcpp/grpcpp.h>
#include "greeter.grpc.pb.h"

using grpc::Channel;
using grpc::ClientContext;
using grpc::Status;
using example::Greeter;
using example::HelloReply;
using example::HelloRequest;

class GreeterClient {
public:
    GreeterClient(std::shared_ptr<Channel> channel)
        : stub_(Greeter::NewStub(channel)) {}

    void SayHello(const std::string& user) {
        HelloRequest request;
        request.set_name(user);

        HelloReply reply;
        ClientContext context;

        Status status = stub_->SayHello(&context, request, &reply);

        if (status.ok()) {
            std::cout << "Greeter received: " << reply.message() << std::endl;
        } else {
            std::cout << "RPC failed: " << status.error_code() << ": " << status.error_message() << std::endl;
        }
    }

private:
    std::unique_ptr<Greeter::Stub> stub_;
};

int main(int argc, char** argv) {
    GreeterClient greeter(grpc::CreateChannel("localhost:50051", grpc::InsecureChannelCredentials()));
    std::string user("world");
    greeter.SayHello(user);
    return 0;
}