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Finish reference count smart pointer

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This commit is contained in:
Dylan Smith
2024-04-19 14:31:51 -04:00
parent 44e3362386
commit ad26c3a4d2
1 changed files with 6 additions and 5 deletions
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11
exercises/19_smart_pointers/rc1.rs
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@@ -10,8 +10,6 @@
// //
// Execute `rustlings hint rc1` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint rc1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
use std::rc::Rc; use std::rc::Rc;
#[derive(Debug)] #[derive(Debug)]
@@ -61,17 +59,17 @@ fn main() {
jupiter.details(); jupiter.details();
// TODO // TODO
let saturn = Planet::Saturn(Rc::new(Sun {})); let saturn = Planet::Saturn(Rc::clone(&sun));
println!("reference count = {}", Rc::strong_count(&sun)); // 7 references println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
saturn.details(); saturn.details();
// TODO // TODO
let uranus = Planet::Uranus(Rc::new(Sun {})); let uranus = Planet::Uranus(Rc::clone(&sun));
println!("reference count = {}", Rc::strong_count(&sun)); // 8 references println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
uranus.details(); uranus.details();
// TODO // TODO
let neptune = Planet::Neptune(Rc::new(Sun {})); let neptune = Planet::Neptune(Rc::clone(&sun));
println!("reference count = {}", Rc::strong_count(&sun)); // 9 references println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
neptune.details(); neptune.details();
@@ -93,12 +91,15 @@ fn main() {
println!("reference count = {}", Rc::strong_count(&sun)); // 4 references println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
// TODO // TODO
drop(earth);
println!("reference count = {}", Rc::strong_count(&sun)); // 3 references println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
// TODO // TODO
drop(venus);
println!("reference count = {}", Rc::strong_count(&sun)); // 2 references println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
// TODO // TODO
drop(mercury);
println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
assert_eq!(Rc::strong_count(&sun), 1); assert_eq!(Rc::strong_count(&sun), 1);