c++11 timeout handler

timeout_handler.cpp

template<typename CALLBACKTYPE,typename... ARGS>
class TimeoutHandler
{
public:
	TimeoutHandler(const int _timeout/*ms*/,CALLBACKTYPE _callback, ARGS... _args)
	{
		std::thread([](TimeoutHandler* this_object,int _timeout, CALLBACKTYPE _callback, ARGS... _args)
		{
			std::this_thread::sleep_for(std::chrono::milliseconds(_timeout));
			if (!this_object->exit_flag)
			{
				_callback(_args...);
			}
			else
			{
				//can't use this_object
			}
		}, this, _timeout, _callback, _args...).detach();
	}
	virtual ~TimeoutHandler()
	{
		exit_flag = true;
	}
private:
	std::atomic<bool> exit_flag = false;
};

void long_excute_function()
{
	bool exit_flag = false;
	TimeoutHandler<std::function<void()>> timeout_handler(1000,
		[&](){
			exit_flag = true;
		});
	while (!exit_flag)
	{
		std::cout << "long_excute_function" << std::endl;
		std::this_thread::sleep_for(std::chrono::milliseconds(10));
	}
}