rc1 solution

1 files changed, 9 insertions, 12 deletions

diff --git a/exercises/19_smart_pointers/rc1.rs b/exercises/19_smart_pointers/rc1.rs
index 19de3db..ecd3438 100644
--- a/exercises/19_smart_pointers/rc1.rs
+++ b/exercises/19_smart_pointers/rc1.rs
@@ -1,15 +1,12 @@
 // In this exercise, we want to express the concept of multiple owners via the
-// Rc<T> type. This is a model of our solar system - there is a Sun type and
-// multiple Planets. The Planets take ownership of the sun, indicating that they
-// revolve around the sun.
-//
-// Make this code compile by using the proper Rc primitives to express that the
-// sun has multiple owners.
+// `Rc<T>` type. This is a model of our solar system - there is a `Sun` type and
+// multiple `Planet`s. The planets take ownership of the sun, indicating that
+// they revolve around the sun.
 
 use std::rc::Rc;
 
 #[derive(Debug)]
-struct Sun {}
+struct Sun;
 
 #[derive(Debug)]
 enum Planet {
@@ -25,7 +22,7 @@ enum Planet {
 
 impl Planet {
     fn details(&self) {
-        println!("Hi from {:?}!", self)
+        println!("Hi from {self:?}!");
     }
 }
 
@@ -39,7 +36,7 @@ mod tests {
 
     #[test]
     fn rc1() {
-        let sun = Rc::new(Sun {});
+        let sun = Rc::new(Sun);
         println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
 
         let mercury = Planet::Mercury(Rc::clone(&sun));
@@ -63,17 +60,17 @@ mod tests {
         jupiter.details();
 
         // TODO
-        let saturn = Planet::Saturn(Rc::new(Sun {}));
+        let saturn = Planet::Saturn(Rc::new(Sun));
         println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
         saturn.details();
 
         // TODO
-        let uranus = Planet::Uranus(Rc::new(Sun {}));
+        let uranus = Planet::Uranus(Rc::new(Sun));
         println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
         uranus.details();
 
         // TODO
-        let neptune = Planet::Neptune(Rc::new(Sun {}));
+        let neptune = Planet::Neptune(Rc::new(Sun));
         println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
         neptune.details();