Struct petgraph::visit::Bfs

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pub struct Bfs<N, VM> {
    pub stack: VecDeque<N>,
    pub discovered: VM,
}
Expand description

A breadth first search (BFS) of a graph.

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

Bfs is not recursive.

Bfs 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::Bfs;

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

let mut bfs = Bfs::new(&graph, a);
while let Some(nx) = bfs.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.

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§stack: VecDeque<N>

The queue of nodes to visit

§discovered: VM

The map of discovered nodes

Implementations§

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

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

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

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

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

Trait Implementations§

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

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<N, VM> Default for Bfs<N, VM>where VM: Default,

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<G> Walker<G> for Bfs<G::NodeId, G::Map>where G: IntoNeighbors + Visitable,

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type Item = <G as GraphBase>::NodeId

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

Advance to the next item
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fn iter(self, context: Context) -> WalkerIter<Self, Context> where Self: Sized, Context: Clone,

Create an iterator out of the walker and given context.

Auto Trait Implementations§

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impl<N, VM> RefUnwindSafe for Bfs<N, VM>where N: RefUnwindSafe, VM: RefUnwindSafe,

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impl<N, VM> Send for Bfs<N, VM>where N: Send, VM: Send,

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impl<N, VM> Sync for Bfs<N, VM>where N: Sync, VM: Sync,

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impl<N, VM> Unpin for Bfs<N, VM>where N: Unpin, VM: Unpin,

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impl<N, VM> UnwindSafe for Bfs<N, VM>where N: UnwindSafe, VM: UnwindSafe,

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.