---

yaml
---
r: 55912
b: refs/heads/master
c: 8f63f97
h: refs/heads/master
v: v3

Author: brendanzab

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: c9620dc0528866bda3a0d70036af082f45c78e96
+refs/heads/master: 8f63f9789b12a69723630ae072b6ba63203ed0f6
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: 79a2b2eafc3c766cecec8a5f76317693bae9ed17
 refs/heads/try: 8eb2bab100b42f0ba751552d8eff00eb2134c55a

trunk/src/libstd/num/rational.rs

@@ -203,6 +203,9 @@ impl<T: Copy + Num + Ord>
     }
 }
 
+impl<T: Copy + Num + Ord>
+    Num for Ratio<T> {}
+
 /* Utils */
 impl<T: Copy + Num + Ord>
     Round for Ratio<T> {
@@ -242,6 +245,12 @@ impl<T: Copy + Num + Ord>
     }
 }
 
+impl<T: Copy + Num + Ord> Fractional for Ratio<T> {
+    #[inline]
+    fn recip(&self) -> Ratio<T> {
+        Ratio::new_raw(self.denom, self.numer)
+    }
+}
 
 /* String conversions */
 impl<T: ToStr> ToStr for Ratio<T> {
@@ -446,6 +455,15 @@ mod test {
         assert_eq!(_3_2.fract(), _1_2);
     }
 
+    #[test]
+    fn test_recip() {
+        assert_eq!(_1 * _1.recip(), _1);
+        assert_eq!(_2 * _2.recip(), _1);
+        assert_eq!(_1_2 * _1_2.recip(), _1);
+        assert_eq!(_3_2 * _3_2.recip(), _1);
+        assert_eq!(_neg1_2 * _neg1_2.recip(), _1);
+    }
+
     #[test]
     fn test_to_from_str() {
         fn test(r: Rational, s: ~str) {