Struct petgraph::graph::Frozen

pub struct Frozen<'a, G: 'a>(_);

Frozen is a graph wrapper.

The Frozen only allows shared access (read-only) to the underlying graph G, but it allows mutable access to its node and edge weights.

This is used to ensure immutability of the graph's structure while permitting weights to be both read and written.

See indexing implementations and the traits Data and DataMap for read-write access to the graph's weights.

Methods

impl<'a, G> Frozen<'a, G>

pub fn new(gr: &'a mut G) -> Self

Create a new Frozen from a mutable reference to a graph.

impl<'a, N, E, Ty, Ix> Frozen<'a, Graph<N, E, Ty, Ix>> where
    Ty: EdgeType,
    Ix: IndexType, 

pub fn index_twice_mut<T, U>(
    &mut self,
    i: T,
    j: U
) -> (&mut <Graph<N, E, Ty, Ix> as Index<T>>::Output, &mut <Graph<N, E, Ty, Ix> as Index<U>>::Output) where
    Graph<N, E, Ty, Ix>: IndexMut<T> + IndexMut<U>,
    T: GraphIndex,
    U: GraphIndex, 

Index the Graph by two indices, any combination of node or edge indices is fine.

Panics if the indices are equal or if they are out of bounds.

Trait Implementations

impl<'a, G> GraphBase for Frozen<'a, G> where
    G: GraphBase, 

type NodeId = G::NodeId

node identifier

type EdgeId = G::EdgeId

edge identifier

impl<'a, 'b, G> IntoNeighbors for &'b Frozen<'a, G> where
    G: IntoNeighbors, 

type Neighbors = G::Neighbors

fn neighbors(self, a: Self::NodeId) -> Self::Neighbors

Return an iterator of the neighbors of node a.

impl<'a, 'b, G> IntoNeighborsDirected for &'b Frozen<'a, G> where
    G: IntoNeighborsDirected, 

type NeighborsDirected = G::NeighborsDirected

fn neighbors_directed(
    self,
    n: Self::NodeId,
    d: Direction
) -> Self::NeighborsDirected

impl<'a, 'b, G> IntoEdges for &'b Frozen<'a, G> where
    G: IntoEdges, 

type Edges = G::Edges

fn edges(self, a: Self::NodeId) -> Self::Edges

impl<'a, 'b, G> IntoEdgesDirected for &'b Frozen<'a, G> where
    G: IntoEdgesDirected, 

type EdgesDirected = G::EdgesDirected

fn edges_directed(self, a: Self::NodeId, dir: Direction) -> Self::EdgesDirected

impl<'a, 'b, G> IntoNodeIdentifiers for &'b Frozen<'a, G> where
    G: IntoNodeIdentifiers, 

type NodeIdentifiers = G::NodeIdentifiers

fn node_identifiers(self) -> Self::NodeIdentifiers

impl<'a, G> Data for Frozen<'a, G> where
    G: Data, 

type NodeWeight = G::NodeWeight

type EdgeWeight = G::EdgeWeight

impl<'a, 'b, G> IntoNodeReferences for &'b Frozen<'a, G> where
    G: IntoNodeReferences, 

type NodeRef = G::NodeRef

type NodeReferences = G::NodeReferences

fn node_references(self) -> Self::NodeReferences

impl<'a, 'b, G> IntoEdgeReferences for &'b Frozen<'a, G> where
    G: IntoEdgeReferences, 

type EdgeRef = G::EdgeRef

type EdgeReferences = G::EdgeReferences

fn edge_references(self) -> Self::EdgeReferences

impl<'a, G> GraphProp for Frozen<'a, G> where
    G: GraphProp, 

type EdgeType = G::EdgeType

The kind edges in the graph.

fn is_directed(&self) -> bool

impl<'a, G> NodeIndexable for Frozen<'a, G> where
    G: NodeIndexable, 

fn node_bound(&self) -> usize

Return an upper bound of the node indices in the graph (suitable for the size of a bitmap).

fn to_index(&self, a: Self::NodeId) -> usize

Convert a to an integer index.

fn from_index(&self, i: usize) -> Self::NodeId

Convert i to a node index

impl<'a, G> NodeCount for Frozen<'a, G> where
    G: NodeCount, 

fn node_count(&self) -> usize

impl<'a, G> NodeCompactIndexable for Frozen<'a, G> where
    G: NodeCompactIndexable, 

impl<'a, G> Visitable for Frozen<'a, G> where
    G: Visitable, 

type Map = G::Map

The associated map type

fn visit_map(&self) -> Self::Map

Create a new visitor map

fn reset_map(&self, map: &mut Self::Map)

Reset the visitor map (and resize to new size of graph if needed)

impl<'a, G> GetAdjacencyMatrix for Frozen<'a, G> where
    G: GetAdjacencyMatrix, 

type AdjMatrix = G::AdjMatrix

The associated adjacency matrix type

fn adjacency_matrix(&self) -> Self::AdjMatrix

Create the adjacency matrix

fn is_adjacent(
    &self,
    matrix: &Self::AdjMatrix,
    a: Self::NodeId,
    b: Self::NodeId
) -> bool

Return true if there is an edge from a to b, false otherwise.

impl<'a, G> DataMap for Frozen<'a, G> where
    G: DataMap, 

fn node_weight(&self, id: Self::NodeId) -> Option<&Self::NodeWeight>

fn edge_weight(&self, id: Self::EdgeId) -> Option<&Self::EdgeWeight>

impl<'a, G> DataMapMut for Frozen<'a, G> where
    G: DataMapMut, 

fn node_weight_mut(&mut self, id: Self::NodeId) -> Option<&mut Self::NodeWeight>

fn edge_weight_mut(&mut self, id: Self::EdgeId) -> Option<&mut Self::EdgeWeight>

impl<'a, G> Deref for Frozen<'a, G>

Deref allows transparent access to all shared reference (read-only) functionality in the underlying graph.

type Target = G

The resulting type after dereferencing.

fn deref(&self) -> &G

Dereferences the value.

impl<'a, G, I> Index<I> for Frozen<'a, G> where
    G: Index<I>, 

type Output = G::Output

The returned type after indexing.

fn index(&self, i: I) -> &G::Output

Performs the indexing (container[index]) operation.

impl<'a, G, I> IndexMut<I> for Frozen<'a, G> where
    G: IndexMut<I>, 

fn index_mut(&mut self, i: I) -> &mut G::Output

Performs the mutable indexing (container[index]) operation.