#pragma once
	#include <thread>
	#include <queue>
	#include <mutex>
	#include <vector>
	#include <condition_variable>
	#include <functional>
	class CThreadPool
	{
	public:
	using Unit = std::function<void()>;
	CThreadPool(size_t numThreads = 0) : stop(false)
	{
	for (size_t i = 0; i < numThreads; ++i)
	{
	workers.emplace_back(&CThreadPool::m_threadedFunction, this);
	};
	}
	~CThreadPool()
	{
	Stop();
	}
	void Stop()
	{
	{
	std::unique_lock<std::mutex> lock(queueMutex);
	stop = true;
	}
	condition.notify_all();
	for (auto& worker : workers)
	{
	worker.join();
	}
	workers.clear();
	}
	void SetThreadsAmount(size_t newAmount)
	{
	int difference = static_cast<int>(newAmount) - static_cast<int>(workers.size());
	if(difference <= 0) { return; }
	for (int i = 0; i < difference; ++i)
	{
	workers.emplace_back(&CThreadPool::m_threadedFunction, this);
	};
	}
	void AddTask(Unit _func)
	{
	{
	std::unique_lock<std::mutex> lock(queueMutex);
	tasks.push(std::move(_func));
	}
	condition.notify_one();
	}
	void m_threadedFunction()
	{
	for(;;)
	{
	Unit task;
	{
	std::unique_lock<std::mutex> lock(queueMutex);
	condition.wait(lock, [this]
	{
	return stop || !tasks.empty();
	});
	if (stop && tasks.empty())
	{
	return;
	}
	task = std::move(tasks.front());
	tasks.pop();
	}
	task();
	}
	}
	std::vector<std::thread> workers;
	std::queue<Unit> tasks;
	std::mutex queueMutex;
	std::condition_variable condition;
	bool stop;
	};