void threadFun(int& a)
{
cout << "this is thread fun !" << endl;
}
int value = 2;
thread t1(threadFun, std::ref(value));
4.Move构造函数
thread(thread&& x)noexcept
调用成功原来x不再是std::thread对象
void threadFun(int& a)
{
cout << "this is thread fun !" << endl;
}
int value = 2;
thread t1(threadFun, std::ref(value));
thread t2(std::move(t1));
t2.join();
三：成员函数
1.get_id()
获取线程ID，返回类型std::thread::id对象。
thread t1(threadFun);
thread::id threadId = t1.get_id();
cout << "线程ID：" << threadId << endl;
//threadId转换成整形值，所需头文件<sstream>
ostringstream oss;
oss << t1.get_id();
string strId = oss.str();
unsigned long long tid = stoull(strId);
cout << "线程ID：" << tid << endl;
2.join()
创建线程执行线程函数，调用该函数会阻塞当前线程，直到线程执行完join才返回。
thread t1(threadFun);
t1.join() //阻塞等待
3.detach()
detach调用之后，目标线程就成为了守护线程，驻留后台运行，与之关联的std::thread对象失去对目标线程的关联，无法再通过std::thread对象取得该线程的控制权。
4.swap()
