Rename append_graph::Incidence to Edge to unify public naming

src/models/append_graph.rs

@@ -5,9 +5,9 @@ use crate::traits::{GraphTopology, IncidenceCursor};
 pub struct Vertex(usize);
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
-pub struct Incidence(usize);
+pub struct Edge(usize);
 
-impl Incidence {
+impl Edge {
     fn normalize(&self) -> Self {
         Self(self.0 & !1)
     }
@@ -15,22 +15,22 @@ impl Incidence {
 
 struct VertexIncidenceHeader {
     incidence_count: usize,
-    first_incidence: Option<Incidence>,
+    first_incidence: Option<Edge>,
 }
 
 #[derive(Copy, Clone)]
 struct IncidenceEntry {
-    next: Option<Incidence>,
+    next: Option<Edge>,
     adjacent: Vertex,
 }
 
 #[derive(Copy, Clone)]
 pub struct AppendGraphIncidenceCursor {
-    incidence: Option<Incidence>,
+    incidence: Option<Edge>,
 }
 
 impl IncidenceCursor<AppendGraph> for AppendGraphIncidenceCursor {
-    fn next(&mut self, graph: &AppendGraph) -> Option<(Vertex, Incidence)> {
+    fn next(&mut self, graph: &AppendGraph) -> Option<(Vertex, Edge)> {
         graph.step_incidence(&mut self.incidence)
     }
 }
@@ -56,15 +56,15 @@ impl AppendGraph {
             adjacent: v2,
         });
         self.vertices[v1.0].incidence_count += 1;
-        self.vertices[v1.0].first_incidence = Some(Incidence(self.incidences.len() - 1));
+        self.vertices[v1.0].first_incidence = Some(Edge(self.incidences.len() - 1));
     }
 
-    fn raw_incidences(&self, v: Vertex) -> impl Iterator<Item = (Vertex, Incidence)> {
+    fn raw_incidences(&self, v: Vertex) -> impl Iterator<Item = (Vertex, Edge)> {
         let mut incidence = self.vertices[v.0].first_incidence;
         std::iter::from_fn(move || self.step_incidence(&mut incidence))
     }
 
-    fn step_incidence(&self, incidence: &mut Option<Incidence>) -> Option<(Vertex, Incidence)> {
+    fn step_incidence(&self, incidence: &mut Option<Edge>) -> Option<(Vertex, Edge)> {
         let current = (*incidence)?;
         let entry = self.incidences[current.0];
         *incidence = entry.next;
@@ -80,7 +80,7 @@ impl Default for AppendGraph {
 
 impl GraphTopology for AppendGraph {
     type Vertex = Vertex;
-    type Edge = Incidence;
+    type Edge = Edge;
     type IncidenceCursor = AppendGraphIncidenceCursor;
 
     fn vertex_count(&self) -> usize {
@@ -130,7 +130,7 @@ impl GraphTopology for AppendGraph {
     }
 
     fn edges(&self) -> impl Iterator<Item = Self::Edge> {
-        (0..self.incidences.len()).step_by(2).map(Incidence)
+        (0..self.incidences.len()).step_by(2).map(Edge)
     }
 
     fn incident_edges(&self, v: Self::Vertex) -> impl Iterator<Item = Self::Edge> {
@@ -158,7 +158,7 @@ impl GraphTopology for AppendGraph {
     fn add_edge(&mut self, v1: Self::Vertex, v2: Self::Vertex) -> Self::Edge {
         self.add_incidence(v1, v2);
         self.add_incidence(v2, v1);
-        Incidence(self.incidences.len() - 2)
+        Edge(self.incidences.len() - 2)
     }
 }
 
@@ -175,7 +175,7 @@ mod tests {
         let v1 = graph.add_vertex();
         let v2 = graph.add_vertex();
         let e = graph.add_edge(v1, v2);
-        let f = Incidence(e.0 + 1);
+        let f = Edge(e.0 + 1);
         let (u1, u2) = graph.incident_vertices(f);
         assert!(
             (u1 == v1 && u2 == v2) || (u1 == v2 && u2 == v1),