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

class ThreadPool {
public:
    ThreadPool(size_t num_threads);
    ~ThreadPool();
    void enqueue_task(std::function<void()> task);

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

    void worker_thread();
};

ThreadPool::ThreadPool(size_t num_threads) : stop(false) {
    for (size_t i = 0; i < num_threads; ++i) {
        workers.emplace_back([this] { this->worker_thread(); });
    }
}

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

void ThreadPool::enqueue_task(std::function<void()> task) {
    {
        std::unique_lock<std::mutex> lock(queue_mutex);
        tasks.push(task);
    }
    condition.notify_one();
}

void ThreadPool::worker_thread() {
    while (true) {
        std::function<void()> task;
        {
            std::unique_lock<std::mutex> lock(queue_mutex);
            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();
    }
}

int main() {
    ThreadPool pool(4);
    for (int i = 0; i < 10; ++i) {
        pool.enqueue_task([i] { std::cout << "Processing task " << i << "\n"; });
    }
    
    return 0;
}