pub struct WalkNeighbors<Ix> { /* private fields */ }
Expand description

A “walker” object that can be used to step through the edge list of a node.

See .detach() for more information.

The walker does not borrow from the graph, so it lets you step through neighbors or incident edges while also mutating graph weights, as in the following example:

use petgraph::visit::Dfs;
use petgraph::Incoming;
use petgraph::stable_graph::StableGraph;

let mut gr = StableGraph::new();
let a = gr.add_node(0.);
let b = gr.add_node(0.);
let c = gr.add_node(0.);
gr.add_edge(a, b, 3.);
gr.add_edge(b, c, 2.);
gr.add_edge(c, b, 1.);

// step through the graph and sum incoming edges into the node weight
let mut dfs = Dfs::new(&gr, a);
while let Some(node) = dfs.next(&gr) {
    // use a detached neighbors walker
    let mut edges = gr.neighbors_directed(node, Incoming).detach();
    while let Some(edge) = edges.next_edge(&gr) {
        gr[node] += gr[edge];
    }
}

// check the result
assert_eq!(gr[a], 0.);
assert_eq!(gr[b], 4.);
assert_eq!(gr[c], 2.);

Implementations§

source§

impl<Ix> WalkNeighbors<Ix>
where Ix: IndexType,

source

pub fn next<N, E, Ty>( &mut self, g: &StableGraph<N, E, Ty, Ix> ) -> Option<(EdgeIndex<Ix>, NodeIndex<Ix>)>
where Ty: EdgeType,

Step to the next edge and its endpoint node in the walk for graph g.

The next node indices are always the others than the starting point where the WalkNeighbors value was created. For an Outgoing walk, the target nodes, for an Incoming walk, the source nodes of the edge.

source

pub fn next_node<N, E, Ty>( &mut self, g: &StableGraph<N, E, Ty, Ix> ) -> Option<NodeIndex<Ix>>
where Ty: EdgeType,

source

pub fn next_edge<N, E, Ty>( &mut self, g: &StableGraph<N, E, Ty, Ix> ) -> Option<EdgeIndex<Ix>>
where Ty: EdgeType,

Trait Implementations§

source§

impl<Ix> Clone for WalkNeighbors<Ix>
where Ix: IndexType,

source§

fn clone(&self) -> WalkNeighbors<Ix>

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more

Auto Trait Implementations§

§

impl<Ix> RefUnwindSafe for WalkNeighbors<Ix>
where Ix: RefUnwindSafe,

§

impl<Ix> Send for WalkNeighbors<Ix>
where Ix: Send,

§

impl<Ix> Sync for WalkNeighbors<Ix>
where Ix: Sync,

§

impl<Ix> Unpin for WalkNeighbors<Ix>
where Ix: Unpin,

§

impl<Ix> UnwindSafe for WalkNeighbors<Ix>
where Ix: UnwindSafe,

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

source§

fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> Downcast<T> for T

source§

fn downcast(&self) -> &T

source§

impl<T> Downcast for T
where T: Any,

source§

fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
source§

fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
source§

fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
source§

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
source§

impl<T> DowncastSync for T
where T: Any + Send + Sync,

source§

fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<S> FromSample<S> for S

source§

fn from_sample_(s: S) -> S

source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

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

source§

fn into(self) -> U

Calls U::from(self).

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

source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> ToSample<U> for T
where U: FromSample<T>,

source§

fn to_sample_(self) -> U

source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
source§

impl<T> TypeData for T
where T: 'static + Send + Sync + Clone,

source§

impl<T> Upcast<T> for T

source§

fn upcast(&self) -> Option<&T>

source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

impl<S, T> Duplex<S> for T
where T: FromSample<S> + ToSample<S>,

source§

impl<T> Settings for T
where T: 'static + Send + Sync,

source§

impl<T> WasmNotSend for T
where T: Send,

source§

impl<T> WasmNotSendSync for T

source§

impl<T> WasmNotSync for T
where T: Sync,