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pub enum Ordering {
Less,
Equal,
Greater,
}
trait Ord {
fn cmp(&self, other: &Self) -> Ordering;
}
// TODO: la structure AVLNode est extrait comme un inductif à un cas
// au lieu d'être extrait comme une structure
struct AVLNode<T> {
value: T,
left: AVLTree<T>,
right: AVLTree<T>,
}
type AVLTree<T> = Option<Box<AVLNode<T>>>;
struct AVLTreeSet<T> {
root: AVLTree<T>,
}
impl<T: Ord> AVLTreeSet<T> {
pub fn new() -> Self {
Self { root: None }
}
pub fn insert(&mut self, value: T) -> bool {
let mut current_tree = &mut self.root;
while let Some(current_node) = current_tree {
match current_node.value.cmp(&value) {
Ordering::Less => current_tree = &mut current_node.right,
Ordering::Equal => return false,
Ordering::Greater => current_tree = &mut current_node.left,
}
}
*current_tree = Some(Box::new(AVLNode {
value,
left: None,
right: None,
}));
true
}
}
impl Ord for u32 {
fn cmp(&self, other: &Self) -> Ordering {
if *self < *other {
Ordering::Less
} else if *self == *other {
Ordering::Equal
} else {
Ordering::Greater
}
}
}
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