switch to NodePointer alias

src/main.rs

@@ -9,20 +9,19 @@ use std::{
     cell::RefCell,
     collections::{hash_map::Entry, HashMap},
     env,
-    f64::INFINITY,
     rc::Rc,
 };
 
 use parse::Record;
 
-type Graph = HashMap<usize, Rc<RefCell<Node>>>;
+type NodePointer = Rc<RefCell<Node>>;
+type Graph = HashMap<usize, NodePointer>;
 type Airports = HashMap<usize, Rc<airport::Airport>>;
 
 #[derive(Debug, Clone)]
 struct Node {
     origin: Rc<airport::Airport>,
     destinations: Vec<Destination>,
-    source_distance: f64,
     visited: bool,
 }
 
@@ -31,7 +30,6 @@ impl Node {
         Node {
             destinations,
             origin,
-            source_distance: INFINITY,
             visited: false,
         }
     }
@@ -39,7 +37,7 @@ impl Node {
 
 #[derive(Clone)]
 struct Destination {
-    node: Rc<RefCell<Node>>,
+    node: NodePointer,
     distance: f64,
 }