1 files changed, 61 insertions, 0 deletions
diff --git a/src/main_custom_ord.rs b/src/main_custom_ord.rs
new file mode 100644
index 0000000..d5bb8f9
--- /dev/null
+++ b/src/main_custom_ord.rs
@@ -0,0 +1,61 @@
+use std::cmp::Ordering;
+
+trait Ord {
+    fn cmp(&self, other: &Self) -> Ordering;
+}
+
+struct AVLNode<T: Ord> {
+    value: T,
+    left: AVLTree<T>,
+    right: AVLTree<T>,
+}
+
+type AVLTree<T> = Option<Box<AVLNode<T>>>;
+
+struct AVLTreeSet<T: Ord> {
+    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
+        }
+    }
+}
+
+fn main() {
+    let mut tree = AVLTreeSet::new();
+    tree.insert(3);
+    tree.insert(2);
+}