C++特性之std::thread

Example : 

auto function = [] {
    std::cout << " hello world " << std::endl;
}

std::thread thread1(function); 

if(thread1.joinable()) {
    thread1.join();
}

thread1.get_id();
std::thread::hardware_concurrency() << std::endl; 

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