Struct petgraph::visit::Topo

pub struct Topo<N, VM> { /* fields omitted */ }

A topological order traversal for a graph.

Note that Topo only visits nodes that are not part of cycles, i.e. nodes in a true DAG. Use other visitors like DfsPostOrder or algorithms like kosaraju_scc to handle graphs with possible cycles.

Methods

impl<N, VM> Topo<N, VM> where
    N: Copy + PartialEq,
    VM: VisitMap<N>, 

pub fn new<G>(graph: G) -> Self where
    G: IntoNodeIdentifiers + IntoNeighborsDirected + Visitable<NodeId = N, Map = VM>, 

Create a new Topo, using the graph's visitor map, and put all initial nodes in the to visit list.

pub fn reset<G>(&mut self, graph: G) where
    G: IntoNodeIdentifiers + IntoNeighborsDirected + Visitable<NodeId = N, Map = VM>, 

Clear visited state, and put all initial nodes in the to visit list.

pub fn next<G>(&mut self, g: G) -> Option<N> where
    G: IntoNeighborsDirected + Visitable<NodeId = N, Map = VM>, 

Return the next node in the current topological order traversal, or None if the traversal is at the end.

Note: The graph may not have a complete topological order, and the only way to know is to run the whole traversal and make sure it visits every node.

Trait Implementations

impl<N: Clone, VM: Clone> Clone for Topo<N, VM>

fn clone(&self) -> Topo<N, VM>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<G> Walker<G> for Topo<G::NodeId, G::Map> where
    G: IntoNeighborsDirected + Visitable, 

type Item = G::NodeId

fn walk_next(&mut self, context: G) -> Option<Self::Item>

Advance to the next item

Important traits for WalkerIter<W, C>

impl<W, C> Iterator for WalkerIter<W, C> where
    W: Walker<C>,
    C: Clone,  type Item = W::Item;

fn iter(self, context: Context) -> WalkerIter<Self, Context> where
    Self: Sized,
    Context: Clone, 

Create an iterator out of the walker and given context.