O

src/main.rs

@@ -1,3 +1,45 @@
-fn main() {
-    println!("Hello, world!");
+use std::ops::Add;
+
+#[derive(Debug, PartialEq)]
+struct Point {
+    x: i32,
+    y: i32,
+}
+
+impl Add for Point {
+    type Output = Point;
+
+    fn add(self, other: Point) -> Point {
+        Point {
+            x: self.x + other.x,
+            y: self.y + other.y,
+        }
+    }
+}
+
+
+#[derive(Debug)]
+struct Millimeters(u32);
+#[derive(Debug)]
+struct Meters(u32);
+
+impl Add<Meters> for Millimeters {
+    type Output = Millimeters;
+
+    fn add(self, other: Meters) -> Millimeters {
+        Millimeters(self.0 + (other.0 * 1000))
+    }
+}
+
+fn main() {
+    assert_eq!(
+            Point { x: 1, y: 0 } + Point { x: 2, y: 3 },
+            Point { x: 3, y: 3 }
+    );
+
+    assert_eq!(
+        Millimeters(1001),
+        Millimeters(1) + Meters(1)
+    )
+        
 }