Function dag::get_future

pub fn get_future<'a, InIndex, OutIndex, F, FStop, Set, Iter>(
    index_set: Iter,
    successor_edges: F,
    stop_condition: FStop
) -> Set
where
    InIndex: 'a + Copy + TryInto<OutIndex>,
    <InIndex as TryInto<OutIndex>>::Error: Debug,
    OutIndex: 'a + Copy + Hash + Eq + PartialEq + Ord,
    F: Fn(InIndex) -> Vec<InIndex>,
    FStop: Fn(InIndex) -> bool,
    Set: SetLike<OutIndex> + Default,
    Iter: IntoIterator<Item = InIndex>,

Return the future set of the nodes in index_set. The future set (including itself) of a node whose stop_condition is true will not be included.