pub fn step_started(&mut self) {
        if self.enabled {
            self.step_time.start();
        }
    }
/// Notify that the time-step has started.
Notify that the time-step has started.
Notify that the time - step has started .
pub fn step_started(&mut self) {
        if self.enabled {
            self.step_time.start();
        }
    }
pub fn step_started ( & mut self ) { if self . enabled { self . step_time . start ( ) ; } }
Notify that the time-step has started.
Notify that the time - step has started .
&mut self