petgraph 0.8.3

Graph data structure library. Provides graph types and graph algorithms.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184

use crate::{Direction, Incoming};

use crate::visit::{
    Data, EdgeCount, EdgeIndexable, EdgeRef, GetAdjacencyMatrix, GraphBase, GraphProp, GraphRef,
    IntoEdgeReferences, IntoEdges, IntoEdgesDirected, IntoNeighbors, IntoNeighborsDirected,
    IntoNodeIdentifiers, IntoNodeReferences, NodeCompactIndexable, NodeCount, NodeIndexable,
    Visitable,
};

/// An edge-reversing graph adaptor.
///
/// All edges have the opposite direction with `Reversed`.
#[derive(Copy, Clone, Debug)]
pub struct Reversed<G>(pub G);

impl<G: GraphBase> GraphBase for Reversed<G> {
    type NodeId = G::NodeId;
    type EdgeId = G::EdgeId;
}

impl<G: GraphRef> GraphRef for Reversed<G> {}

Data! {delegate_impl [[G], G, Reversed<G>, access0]}

impl<G> IntoNeighbors for Reversed<G>
where
    G: IntoNeighborsDirected,
{
    type Neighbors = G::NeighborsDirected;
    fn neighbors(self, n: G::NodeId) -> G::NeighborsDirected {
        self.0.neighbors_directed(n, Incoming)
    }
}

impl<G> IntoNeighborsDirected for Reversed<G>
where
    G: IntoNeighborsDirected,
{
    type NeighborsDirected = G::NeighborsDirected;
    fn neighbors_directed(self, n: G::NodeId, d: Direction) -> G::NeighborsDirected {
        self.0.neighbors_directed(n, d.opposite())
    }
}

impl<G> IntoEdges for Reversed<G>
where
    G: IntoEdgesDirected,
{
    type Edges = ReversedEdges<G::EdgesDirected>;
    fn edges(self, a: Self::NodeId) -> Self::Edges {
        ReversedEdges {
            iter: self.0.edges_directed(a, Incoming),
        }
    }
}

impl<G> IntoEdgesDirected for Reversed<G>
where
    G: IntoEdgesDirected,
{
    type EdgesDirected = ReversedEdges<G::EdgesDirected>;
    fn edges_directed(self, a: Self::NodeId, dir: Direction) -> Self::Edges {
        ReversedEdges {
            iter: self.0.edges_directed(a, dir.opposite()),
        }
    }
}

impl<G: Visitable> Visitable for Reversed<G> {
    type Map = G::Map;
    fn visit_map(&self) -> G::Map {
        self.0.visit_map()
    }
    fn reset_map(&self, map: &mut Self::Map) {
        self.0.reset_map(map);
    }
}

/// A reversed edges iterator.
#[derive(Debug, Clone)]
pub struct ReversedEdges<I> {
    iter: I,
}

impl<I> Iterator for ReversedEdges<I>
where
    I: Iterator,
    I::Item: EdgeRef,
{
    type Item = ReversedEdgeReference<I::Item>;
    fn next(&mut self) -> Option<Self::Item> {
        self.iter.next().map(ReversedEdgeReference)
    }
    fn size_hint(&self) -> (usize, Option<usize>) {
        self.iter.size_hint()
    }
}

/// A reversed edge reference
#[derive(Copy, Clone, Debug)]
pub struct ReversedEdgeReference<R>(R);

impl<R> ReversedEdgeReference<R> {
    /// Return the original, unreversed edge reference.
    pub fn as_unreversed(&self) -> &R {
        &self.0
    }

    /// Consume `self` and return the original, unreversed edge reference.
    pub fn into_unreversed(self) -> R {
        self.0
    }
}

/// An edge reference
impl<R> EdgeRef for ReversedEdgeReference<R>
where
    R: EdgeRef,
{
    type NodeId = R::NodeId;
    type EdgeId = R::EdgeId;
    type Weight = R::Weight;
    fn source(&self) -> Self::NodeId {
        self.0.target()
    }
    fn target(&self) -> Self::NodeId {
        self.0.source()
    }
    fn weight(&self) -> &Self::Weight {
        self.0.weight()
    }
    fn id(&self) -> Self::EdgeId {
        self.0.id()
    }
}

impl<G> IntoEdgeReferences for Reversed<G>
where
    G: IntoEdgeReferences,
{
    type EdgeRef = ReversedEdgeReference<G::EdgeRef>;
    type EdgeReferences = ReversedEdgeReferences<G::EdgeReferences>;
    fn edge_references(self) -> Self::EdgeReferences {
        ReversedEdgeReferences {
            iter: self.0.edge_references(),
        }
    }
}

/// A reversed edge references iterator.
#[derive(Debug, Clone)]
pub struct ReversedEdgeReferences<I> {
    iter: I,
}

impl<I> Iterator for ReversedEdgeReferences<I>
where
    I: Iterator,
    I::Item: EdgeRef,
{
    type Item = ReversedEdgeReference<I::Item>;
    fn next(&mut self) -> Option<Self::Item> {
        self.iter.next().map(ReversedEdgeReference)
    }
    fn size_hint(&self) -> (usize, Option<usize>) {
        self.iter.size_hint()
    }
}

macro_rules! access0 {
    ($e:expr) => {
        $e.0
    };
}

NodeIndexable! {delegate_impl [[G], G, Reversed<G>, access0]}
NodeCompactIndexable! {delegate_impl [[G], G, Reversed<G>, access0]}
IntoNodeIdentifiers! {delegate_impl [[G], G, Reversed<G>, access0]}
IntoNodeReferences! {delegate_impl [[G], G, Reversed<G>, access0]}
GraphProp! {delegate_impl [[G], G, Reversed<G>, access0]}
NodeCount! {delegate_impl [[G], G, Reversed<G>, access0]}
EdgeCount! {delegate_impl [[G], G, Reversed<G>, access0]}
EdgeIndexable! {delegate_impl [[G], G, Reversed<G>, access0]}
GetAdjacencyMatrix! {delegate_impl [[G], G, Reversed<G>, access0]}