C++线程池（支持任意类型函数，支持优先级）

#include <functional>
#include <future>
#include <iostream>
#include <mutex>
#include <queue>
#include <vector>

class ThreadPool {
public:
    struct Task {
        Task() {}
        Task(const uint32_t &p, const std::function<void()> &f): priority(p), func(f) {}

        uint32_t priority;
        std::function<void()> func;

        bool operator<(const Task &other) const {
            return priority < other.priority;
        }
    };

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

    template <class F, class... Args>
    auto AddTask(const uint32_t priority, F &&f, Args &&...args) -> std::future<decltype(f(args...))> {
        using return_type = decltype(f(args...));
        auto task = std::make_shared<std::packaged_task<return_type()>>(std::bind(std::forward<F>(f), std::forward<Args>(args)...));

        auto res = task->get_future();
        {
            std::unique_lock<std::mutex> lock(queue_mutex);
            if (!stop) {
				tasks.emplace(priority, [task]() { (*task)(); });
            }
        }
        condition.notify_one();

        return res;
    }

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

private:
    std::vector<std::thread> workers;
    std::priority_queue<Task> tasks;
    std::mutex queue_mutex;
    std::condition_variable condition;
    bool stop;
};