您好，我是AI智能助手，有什么可以效劳的吗

下面是一个使用C++实现gRPC异步模型双向流式传输的例子：

#include <iostream>
#include <memory>
#include <string>
#include <grpcpp/grpcpp.h>
#include <grpc/support/log.h>
#include <grpcpp/create_channel.h>
#include "your_service.grpc.pb.h"

using grpc::Server;
using grpc::ServerAsyncResponseWriter;
using grpc::ServerBuilder;
using grpc::ServerCompletionQueue;
using grpc::ServerContext;
using grpc::Status;
using grpc::Channel;
using grpc::ClientAsyncResponseReader;
using grpc::ClientContext;
using grpc::CompletionQueue;
using grpc::ClientAsyncReaderWriter;
using your_service::YourRequest;
using your_service::YourResponse;
using your_service::YourService;

class YourServiceImpl final : public YourService::Service {
public:
    explicit YourServiceImpl(CompletionQueue* cq) : cq_(cq), responder_(&ctx_), status_(CREATE) {
        Proceed();
    }

    void Proceed() {
        if (status_ == CREATE) {
            status_ = PROCESS;
            service_->RequestYourMethod(&ctx_, &request_, &responder_, cq_, cq_, this);
        } else if (status_ == PROCESS) {
            new YourServiceImpl(cq_);

            std::string prefix("Hello ");
            std::string message = prefix + request_.name();
            response_.set_message(message);

            status_ = FINISH;
            responder_.Finish(response_, Status::OK, this);
        } else {
            GPR_ASSERT(status_ == FINISH);
            delete this;
        }
    }

private:
    YourRequest request_;
    YourResponse response_;
    ServerAsyncResponseWriter<YourResponse> responder_;
    ServerContext ctx_;

    enum CallStatus { CREATE, PROCESS, FINISH };
    CallStatus status_;

    CompletionQueue* cq_;
};

class YourClient {
public:
    explicit YourClient(std::shared_ptr<Channel> channel)
        : stub_(YourService::NewStub(channel)) {}

    void YourMethod(const std::string& name) {
        YourRequest request;
        request.set_name(name);

        AsyncClientCall* call = new AsyncClientCall;
        call->response_reader = stub_->PrepareAsyncYourMethod(&call->context, request, &cq_);
        call->response_reader->StartCall();
        call->response_reader->Finish(&call->response, &call->status, (void*)call);
    }

    void AsyncCompleteRpc() {
        void* got_tag;
        bool ok = false;

        while (cq_.Next(&got_tag, &ok)) {
            AsyncClientCall* call = static_cast<AsyncClientCall*>(got_tag);
            GPR_ASSERT(ok);

            if (call->status.ok()) {
                std::cout << "Received message: " << call->response.message() << std::endl;
            } else {
                std::cout << "RPC failed" << std::endl;
            }

            delete call;
        }
    }

private:
    struct AsyncClientCall {
        YourResponse response;
        ClientContext context;
        Status status;
        std::unique_ptr<ClientAsyncResponseReader<YourResponse>> response_reader;
    };

    std::unique_ptr<YourService::Stub> stub_;
    CompletionQueue cq_;
};

void RunServer() {
    std::string server_address("0.0.0.0:50051");
    YourServiceImpl service(new ServerCompletionQueue);

    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) {
    std::thread server_thread(RunServer);

    std::shared_ptr<Channel> channel = grpc::CreateChannel("localhost:50051", grpc::InsecureChannelCredentials());
    YourClient client(channel);

    client.YourMethod("Alice");
    client.YourMethod("Bob");
    client.YourMethod("Charlie");

    client.AsyncCompleteRpc();
    server_thread.join();

    return 0;
}

请注意，你需要根据你的实际情况修改 YourRequest、YourResponse、YourService、YourMethod 等类和方法的名称。此外，你还需要正确配置服务器和客户端地址和端口号。