pub fn new() -> Self {
        ScheduleTree {
            root: None,
            scope: None,
            data_map: HashMap::new(),
        }
    }
/// Returns an empty schedule tree.
Returns an empty schedule tree.
Returns an empty schedule tree .
pub fn new() -> Self {
        ScheduleTree {
            root: None,
            scope: None,
            data_map: HashMap::new(),
        }
    }
pub fn new ( ) -> Self { ScheduleTree { root : None , scope : None , data_map : HashMap :: new ( ) , } }
Returns an empty schedule tree.
Returns an empty schedule tree .