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| author | Hunter Kvalevog <hunter@kvog.sh> | 2026-10-02 21:53:51 -0500 |
|---|---|---|
| committer | Hunter Kvalevog <hunter@kvog.sh> | 2026-10-02 21:53:51 -0500 |
| commit | 4dfc11d74ab02ac5765ae5d08fb750c91f4744b4 (patch) | |
| tree | 17ba62056d6b691dd0217b0e8f1b3a5826dce0f6 /rustlings/exercises/19_smart_pointers/box1.rs | |
| parent | 02d8f1c62896576e1266553a56980eddbc2a88d7 (diff) | |
rustlings: move to rust/
Diffstat (limited to 'rustlings/exercises/19_smart_pointers/box1.rs')
| -rw-r--r-- | rustlings/exercises/19_smart_pointers/box1.rs | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/rustlings/exercises/19_smart_pointers/box1.rs b/rustlings/exercises/19_smart_pointers/box1.rs deleted file mode 100644 index ee379ca..0000000 --- a/rustlings/exercises/19_smart_pointers/box1.rs +++ /dev/null @@ -1,50 +0,0 @@ -// At compile time, Rust needs to know how much space a type takes up. This -// becomes problematic for recursive types, where a value can have as part of -// itself another value of the same type. To get around the issue, we can use a -// `Box` - a smart pointer used to store data on the heap, which also allows us -// to wrap a recursive type. -// -// The recursive type we're implementing in this exercise is the "cons list", a -// data structure frequently found in functional programming languages. Each -// item in a cons list contains two elements: The value of the current item and -// the next item. The last item is a value called `Nil`. - -// TODO: Use a `Box` in the enum definition to make the code compile. -#[derive(PartialEq, Debug)] -enum List { - Cons(i32, Box<List>), - Nil, -} - -// TODO: Create an empty cons list. -fn create_empty_list() -> List { - List::Nil -} - -// TODO: Create a non-empty cons list. -fn create_non_empty_list() -> List { - List::Cons(1, Box::new(List::Nil)) -} - -fn main() { - println!("This is an empty cons list: {:?}", create_empty_list()); - println!( - "This is a non-empty cons list: {:?}", - create_non_empty_list(), - ); -} - -#[cfg(test)] -mod tests { - use super::*; - - #[test] - fn test_create_empty_list() { - assert_eq!(create_empty_list(), List::Nil); - } - - #[test] - fn test_create_non_empty_list() { - assert_ne!(create_empty_list(), create_non_empty_list()); - } -} |