C++中的多线程服务器如何设计？

#include <iostream>
#include <thread>
#include <mutex>
#include <condition_variable>
#include <queue>
#include <vector>
#include <functional>

class ThreadPool {
private:
    std::vector<std::thread> workers;
    std::queue<std::function<void()>> tasks;
    std::mutex queue_mutex;
    std::condition_variable condition;
    bool stop;

public:
    ThreadPool(size_t threads) : stop(false) {
        for (size_t i = 0; i < threads; ++i)
            workers.emplace_back([this] {
                while (true) {
                    std::function<void()> task;
                    {
                        std::unique_lock<std::mutex> lock(this->queue_mutex);
                        this->condition.wait(lock, [this] { return this->stop || !this->tasks.empty(); });
                        if (this->stop && this->tasks.empty())
                            return;
                        task = std::move(this->tasks.front());
                        this->tasks.pop();
                    }
                    task();
                }
            });
    }

    ~ThreadPool() {
        {
            std::unique_lock<std::mutex> lock(queue_mutex);
            stop = true;
        }
        condition.notify_all();
        for (std::thread &worker : workers)
            worker.join();
    }

    template<class F, class... Args>
    void enqueue(F&& f, Args&&... args) {
        auto task = std::bind(std::forward<F>(f), std::forward<Args>(args)...);
        {
            std::unique_lock<std::mutex> lock(queue_mutex);
            tasks.emplace([task]() { task(); });
        }
        condition.notify_one();
    }
};

class Server {
private:
    ThreadPool pool;

public:
    Server(size_t threads) : pool(threads) {}

    void start() {
        // 启动服务器逻辑
        std::cout << "Server started with " << pool.workers.size() << " threads." << std::endl;
        // 这里可以添加服务器的具体逻辑
    }

    void handleClient(int clientId) {
        pool.enqueue([clientId] {
            std::cout << "Handling client " << clientId << std::endl;
            // 处理客户端请求的逻辑
        });
    }
};

int main() {
    Server server(4); // 使用4个线程
    server.start();
    server.handleClient(1);
    server.handleClient(2);
    // 模拟更多客户端请求
    return 0;
}