Struct Undernath 

pub struct Undernath { /* private fields */ }

Who hangs under whom. An index over the under edges, built so it can be walked up and down without scanning again.

Implementations

impl Undernath

pub fn add(&mut self, child: MoveId, parent: MoveId)

pub fn parents_of(&self, child: MoveId) -> Vec<MoveId>

pub fn children_of(&self, parent: MoveId) -> Vec<MoveId>

pub fn is_over(&self, maybe: MoveId, one: MoveId) -> bool

Whether maybe is above one, looking upwards.

What it takes to refuse a cycle before writing it: with under multivalued the shape can no longer be trusted, and a cycle hangs every later walk — including the one that would draw it.

Trait Implementations

impl Debug for Undernath

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Undernath

fn default() -> Undernath

Returns the “default value” for a type.