How do I implement thread pools in C++ using async?

How do I implement thread pools in C++ using async?

To implement thread pools in C++, you can use the std::async function along with a task queue. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

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

class ThreadPool {
public:
    ThreadPool(size_t threads);
    template<class F>
    auto enqueue(F&& f) -> std::future<decltype(f())>;
    ~ThreadPool();
private:
    std::vector<std::thread> workers;
    std::queue<std::function<void()>> tasks;
    std::mutex queue_mutex;
    std::condition_variable condition;
    bool stop;
};

// Implementation of ThreadPool methods...

This sets up a basic thread pool. Would you like to know more about the implementation details?

Yes, what are the key methods I need to implement?

You need to implement methods for adding tasks to the queue, starting worker threads, and handling task execution. Key methods include enqueue, a destructor to join threads, and a mechanism to stop the pool.