Struct petgraph::visit::Dfs

pub struct Dfs<N, VM> {
    pub stack: Vec<N>,
    pub discovered: VM,
}

Visit nodes of a graph in a depth-first-search (DFS) emitting nodes in preorder (when they are first discovered).

The traversal starts at a given node and only traverses nodes reachable from it.

Dfs is not recursive.

Dfs does not itself borrow the graph, and because of this you can run a traversal over a graph while still retaining mutable access to it, if you use it like the following example:

use petgraph::Graph;
use petgraph::visit::Dfs;

let mut graph = Graph::<_,()>::new();
let a = graph.add_node(0);

let mut dfs = Dfs::new(&graph, a);
while let Some(nx) = dfs.next(&graph) {
    // we can access `graph` mutably here still
    graph[nx] += 1;
}

assert_eq!(graph[a], 1);

Note: The algorithm may not behave correctly if nodes are removed during iteration. It may not necessarily visit added nodes or edges.

Fields

stack: Vec<N>

The stack of nodes to visit

discovered: VM

The map of discovered nodes

Methods

impl<N, VM> Dfs<N, VM> where N: Copy, VM: VisitMap<N>

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

Create a new Dfs, using the graph's visitor map, and put start in the stack of nodes to visit.

fn from_parts(stack: Vec<N>, discovered: VM) -> Self

Create a Dfs from a vector and a visit map

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

Clear the visit state

fn empty<G>(graph: G) -> Self where G: GraphRef + Visitable<NodeId=N, Map=VM>

Create a new Dfs using the graph's visitor map, and no stack.

fn move_to(&mut self, start: N)

Keep the discovered map, but clear the visit stack and restart the dfs from a particular node.

fn next<G>(&mut self, graph: G) -> Option<N> where G: IntoNeighbors<NodeId=N>

Return the next node in the dfs, or None if the traversal is done.

Trait Implementations

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

fn clone(&self) -> Dfs<N, VM>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<N: Debug, VM: Debug> Debug for Dfs<N, VM>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.