Merge pull request #60 from wookietreiber/topic/neg

adds neg for ordered float

Author: mbrubeck

src/lib.rs

@@ -186,6 +186,14 @@ impl<T: Float + FromStr> FromStr for OrderedFloat<T> {
     }
 }
 
+impl<T: Float> Neg for OrderedFloat<T> {
+    type Output = Self;
+
+    fn neg(self) -> Self {
+        OrderedFloat(-self.0)
+    }
+}
+
 /// A wrapper around Floats providing an implementation of Ord and Hash.
 ///
 /// A NaN value cannot be stored in this type.

tests/test.rs

@@ -535,3 +535,13 @@ fn test_add_fails_on_nan() {
     let b = NotNan::new(std::f32::NEG_INFINITY).unwrap();
     let _c = a + b;
 }
+
+#[test]
+fn ordered_f32_neg() {
+    assert_eq!(OrderedFloat(-7.0f32), -OrderedFloat(7.0f32));
+}
+
+#[test]
+fn ordered_f64_neg() {
+    assert_eq!(OrderedFloat(-7.0f64), -OrderedFloat(7.0f64));
+}