1 bool wait_for_wake = false;
 2 std::mutex process_mutex;
 3 std::condition_variable_any process_cond;
 4 std::unique_lock<std::mutex> lock(process_mutex);
 5 auto Timer = [&process_mutex, &process_cond](const int &wait_time) {
 6   std::this_thread::sleep_for(std::chrono::milliseconds(wait_time));
 
 7   process_cond.notify_one();
 8 };
 9 
10 // use
11 auto wait_time = 50; 
12 std::thread(Timer, wait_time).detach();
13 wait_for_wake = true;
14 
15 while (wait_for_wake) {
16   process_cond.wait(lock);
17   wait_for_wake = false;
18 }

c++ std::thread + lambda 實現計時器