Some Macros

src/main.rs

@@ -124,4 +124,7 @@ fn main() {
     );
 
     println!("Reference counter = {}", Rc::strong_count(&tex));
+
+    let a = Vector3::new(2.0, 3.0, 1.0);
+    let b = 10.0 * a;
 }

src/math.rs

@@ -1,17 +1,23 @@
 use std::ops::{Add, Div, Mul, Sub};
 
-#[derive(Copy, Clone, PartialEq, Debug)]
-pub struct Vector3<T> {
-    x: T,
-    y: T,
-    z: T,
+macro_rules! create_vector {
+    ($name:ident [$($elem:ident),+] ) => {
+        #[derive(Copy, Clone, PartialEq, Debug)]
+        pub struct $name<T> {
+            $($elem: T,)*
+        }
+
+        impl<T> $name<T> {
+            pub fn new($($elem : T,)*) -> $name<T> {
+                $name { $($elem,)* }
+            }
+        }
+    };
 }
 
-impl<T> Vector3<T> {
-    pub fn new(x: T, y: T, z: T) -> Vector3<T> {
-        Vector3 { x, y, z }
-    }
-}
+create_vector! { Vector4 [x, y, z, w] }
+create_vector! { Vector3 [x, y, z] }
+create_vector! { Vector2 [x, y] }
 
 impl<T> Add for Vector3<T>
 where
@@ -46,29 +52,20 @@ where
     }
 }
 
-impl Mul<Vector3<f64>> for f64 {
-    type Output = Vector3<f64>;
+macro_rules! impl_mul_for_vector3 {
+    ($($type:ty)+) => {
+        $(
+        impl Mul<Vector3<$type>> for $type {
+            type Output = Vector3<$type>;
 
-    fn mul(self, rhs: Vector3<f64>) -> Self::Output {
-        Vector3::new(self * rhs.x, self * rhs.y, self * rhs.z)
-    }
+            fn mul(self, rhs: Vector3<$type>) -> Self::Output {
+                Vector3::new(self * rhs.x, self * rhs.y, self * rhs.z)
+            }
+        })*
+    };
 }
 
-impl Mul<Vector3<f32>> for f32 {
-    type Output = Vector3<f32>;
-
-    fn mul(self, rhs: Vector3<f32>) -> Self::Output {
-        Vector3::new(self * rhs.x, self * rhs.y, self * rhs.z)
-    }
-}
-
-impl Mul<Vector3<i32>> for i32 {
-    type Output = Vector3<i32>;
-
-    fn mul(self, rhs: Vector3<i32>) -> Self::Output {
-        Vector3::new(self * rhs.x, self * rhs.y, self * rhs.z)
-    }
-}
+impl_mul_for_vector3! { i32 f32 f64 }
 
 impl<T> Mul for Vector3<T>
 where