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class Thread
{
public:
	Thread(const Thread&);
	Thread() : handle(NULL), running(false), finished(false)
	{
		handle = (HANDLE)(_beginthreadex(NULL, 0, &(Thread::threadRun), this, CREATE_SUSPENDED, NULL));
	}
	~Thread()
	{
		if(isRunning()) {
			TerminateThread(handle, 0);
		} 
		CloseHandle(handle);
	}
	void start(void* arg)
	{
		if(isRunning() || isFinished()) {
			throw Exception("Thread is running or finished!");
		} else {
			this->arg = arg;
			ResumeThread(handle);
		}
		
	}
	void pause()
	{
		if(isRunning()) {
			SuspendThread(handle);
		} else {
			throw Exception("Thread is not running or finished!");
		}
	}
	void resume()
	{
		if(!(isRunning())) {
			throw Exception("Thread is finished!");
		} else {
			ResumeThread(handle);
		}
	}
	void stop()
	{
		if(isRunning()) {
			TerminateThread(handle, 0);
			running = false;
			finished = true;
			throw Exception("Thread stopped!");
		} else {
			throw Exception("Thread is not running or finished!");
		}
	}
	void setPriority(ThreadPriority priority)
	{
		if(isFinished()) {
			throw Exception("Thread is finished!");
		} else {
			switch(priority) {
			case ThreadPriorityLow:
				SetThreadPriority(handle, THREAD_PRIORITY_LOWEST);
				break;
			case ThreadPriorityNormal:
				SetThreadPriority(handle, THREAD_PRIORITY_NORMAL);
				break;
			case ThreadPriorityHigh:
				SetThreadPriority(handle, THREAD_PRIORITY_HIGHEST);
				break;
			default:
				throw Exception("Invalid priority!");
				break;
			}
		}
	}
	bool isRunning()
	{
		return (running);
	}
	bool isFinished()
	{
		return (finished);
	}
protected:
	virtual void run(void *arg) = 0;
private:
	static unsigned int __stdcall threadRun(void *arg)
	{
		Thread *thread = static_cast<Thread*>(arg);
		thread->running = true;
		thread->run(thread->arg);
		thread->running = false;
		thread->finished = true;
		_endthreadex(0);
		return (0);
	}
	void *arg;
	HANDLE handle;
	bool running;
	bool finished;
};