impl Signed and Unsigned for Wrapping<T>

traits/src/sign.rs

@@ -1,5 +1,6 @@
 use std::ops::Neg;
 use std::{f32, f64};
+use std::num::Wrapping;
 
 use Num;
 
@@ -73,6 +74,30 @@ macro_rules! signed_impl {
 
 signed_impl!(isize i8 i16 i32 i64);
 
+impl<T: Signed> Signed for Wrapping<T> where Wrapping<T>: Num + Neg<Output=Self>
+{
+    #[inline]
+    fn abs(&self) -> Self {
+        Wrapping(self.0.abs())
+    }
+
+    #[inline]
+    fn abs_sub(&self, other: &Self) -> Self {
+        Wrapping(self.0.abs_sub(&other.0))
+    }
+
+    #[inline]
+    fn signum(&self) -> Self {
+        Wrapping(self.0.signum())
+    }
+
+    #[inline]
+    fn is_positive(&self) -> bool { self.0.is_positive() }
+
+    #[inline]
+    fn is_negative(&self) -> bool { self.0.is_negative() }
+}
+
 macro_rules! signed_float_impl {
     ($t:ty, $nan:expr, $inf:expr, $neg_inf:expr) => {
         impl Signed for $t {
@@ -159,3 +184,5 @@ macro_rules! empty_trait_impl {
 }
 
 empty_trait_impl!(Unsigned for usize u8 u16 u32 u64);
+
+impl<T: Unsigned> Unsigned for Wrapping<T> where Wrapping<T>: Num {}