From 8f63f9789b12a69723630ae072b6ba63203ed0f6 Mon Sep 17 00:00:00 2001
From: Brendan Zabarauskas <bjzaba@yahoo.com.au>
Date: Mon, 29 Apr 2013 16:00:27 +1000
Subject: Implement Fractional for Ratio

---
 src/libstd/num/rational.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'src/libstd/num')

diff --git a/src/libstd/num/rational.rs b/src/libstd/num/rational.rs
index 34308988fa5..a7c170c1cd6 100644
--- a/src/libstd/num/rational.rs
+++ b/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) {
-- 
cgit 1.4.1-3-g733a5