包装类对象析构时执行线程

#include <iostream>
#include <thread>

struct thread_guard
{
public:
	std::thread& t;
	explicit thread_guard(std::thread& _t) : t(_t) {};
	~thread_guard()
	{
		if(t.joinable())
			t.join();
	}

	thread_guard(thread_guard&) = delete;
	thread_guard& operator= (thread_guard const &) = delete;
};

int main()
{
	std::thread t([] {
		std::cout << "bye\n";
		});

	thread_guard g(t);
	for (int i = 0; i < 12; i++)
		std::cout << i << std::endl;

	return 0;
}