{

std::this_thread::sleep_for(std::chrono::seconds(3));

cout << a << "--" << b << "--" << c << endl;

{

std::thread t1(func, 1, 2, 3);

cout << "ID=" << t1.get_id() << std::endl;

//t1.join();

//后台执行t2线程，程序退出也不会异常

std::thread t2(func, 2, 3, 4);

cout << "ID=" << t2.get_id() << std::endl;

//t2.join();

//以lambda表达式创建线程

std::thread t4([](int a, int b, int c){

std::this_thread::sleep_for(std::chrono::seconds(1));

cout << a << "--" << b << "--" << c << endl;

}, 4,5,6);

cout << "ID=" << t4.get_id() << std::endl;

t1.join();

cout << "join t1" << endl;

t2.join();

cout << "join t2" << endl;

t4.join();

cout << "join t4" << endl;

//std::thread t3(func, 3, 4, 5);

return 0;

}