请问一下：exception caught in Thread  reason: call to empty boost::function Aborted (core dumped)

Thread_test.cc
我因为一些业务原因，需要在Thread.cc里面新增pthread_detach()函数，用于取代join()，但是他直接提示我为空，请问陈硕大佬，这是为什么呀
class test
{
private:
public:
	void foo()
	{
		while (1)
		{
		}
	}
	void start()
	{
		muduo::Thread t1(std::bind(&test::foo, this));
		t1.start();
		t1.deteach();
	}
	test() {}
	~test() {}
};

int main()
{
	test t;
	t.start();
	while (1)
	{
		/* code */
	}
}