add cmp() to f32 and f64, with tests

src/libstd/cmp.rs

@@ -72,6 +72,9 @@ totaleq_impl!(uint)
 
 totaleq_impl!(char)
 
+totaleq_impl!(f32)
+totaleq_impl!(f64)
+
 #[deriving(Clone, Eq)]
 pub enum Ordering { Less = -1, Equal = 0, Greater = 1 }
 
@@ -126,6 +129,9 @@ totalord_impl!(uint)
 
 totalord_impl!(char)
 
+totalord_impl!(f32)
+totalord_impl!(f64)
+
 /// Compares (a1, b1) against (a2, b2), where the a values are more significant.
 pub fn cmp2<A:TotalOrd,B:TotalOrd>(
     a1: &A, b1: &B,
@@ -216,6 +222,18 @@ mod test {
         assert!(!2.equals(&17));
     }
 
+    #[test]
+    fn test_f32_totaleq() {
+        assert!(3.14f32.cmp(3.0f32), Less);
+        assert!(4.12f32.cmp(4.11f32), Greater);
+    }
+
+    #[test]
+    fn test_f64_totaleq() {
+        assert!(3.14f64.cmp(3.0f64), Less);
+        assert!(4.12f64.cmp(4.11f64), Greater);
+    }
+
     #[test]
     fn test_ordering_order() {
         assert!(Less < Equal);