}
#[macro_export]
-macro_rules! rect {
- ( $x:expr, $y:expr ) => {
- Rect { x: $x, y: $y }
+macro_rules! dimen {
+ ( $w:expr, $h:expr ) => {
+ Dimension { width: $w, height: $h }
};
}
-#[derive(Default)]
-pub struct Rect<T> {
+#[derive(Debug, Default)]
+pub struct Dimension<T> {
pub width: T,
pub height: T,
}
-impl<T: Mul<Output = T> + Copy> Rect<T> {
+impl<T: Mul<Output = T> + Copy> Dimension<T> {
#[allow(dead_code)]
pub fn area(&self) -> T {
self.width * self.height
}
}
-impl<T> From<(T, T)> for Rect<T> {
+impl<T> From<(T, T)> for Dimension<T> {
fn from(item: (T, T)) -> Self {
- Rect {
+ Dimension {
width: item.0,
height: item.1,
}
}
#[test]
- fn area_for_rect_of_multipliable_type() {
- let r: Rect<_> = (30, 20).into(); // the Into trait uses the From trait
+ fn area_for_dimension_of_multipliable_type() {
+ let r: Dimension<_> = (30, 20).into(); // the Into trait uses the From trait
assert_eq!(r.area(), 30 * 20);
- // let a = Rect::from(("a".to_string(), "b".to_string())).area(); // this doesn't work, because area() is not implemented for String
+ // let a = Dimension::from(("a".to_string(), "b".to_string())).area(); // this doesn't work, because area() is not implemented for String
}
}