54 typedef enum { low = 0, high, undefined } signal_t;  enumerator
248         clock_body(std::size_t& _ms, int& _reps) : ms(_ms), reps(_reps), val(low) {}  in clock_body()
254             if (val == low)  in operator ()()
257                 val = low;  in operator ()()
310         push_button_node.try_put(low);  in push_button()
313         push_button_node.try_put(low);  in push_button()
327         push_button_node.try_put(low);  in release()
352             state = low;  in flip()
358         state = low;  in activate()
400                 signal_t state = low;  in operator ()()
401                 if (port == low)  in operator ()()
436                 if (ports[i] == low) {  in operator ()()
437                     new_state = low;  in operator ()()
440                 else if (ports[i] == undefined && new_state != low) {  in operator ()()
477             signal_t new_state = low;  in operator ()()
521             signal_t new_state = low;  in operator ()()
527                 else if (ports[i] == high && new_state == low) {  in operator ()()
532                     new_state = low;  in operator ()()
572             signal_t new_state = low;  in operator ()()
585                 new_state = low;  in operator ()()
586             else if (new_state == low)  in operator ()()
664         else if (state == low)  in display()