From 47b8c7b5ae1fc10eab28430f9c2878524dadb302 Mon Sep 17 00:00:00 2001
From: Yoan Lecoq <yoanlecoq.io@gmail.com>
Date: Sat, 29 Apr 2017 08:29:02 +0200
Subject: [PATCH] impl Wrapping ops for Wrapping<T>

---
 traits/src/ops/wrapping.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/traits/src/ops/wrapping.rs b/traits/src/ops/wrapping.rs
index 40b266d..cd68ac4 100644
--- a/traits/src/ops/wrapping.rs
+++ b/traits/src/ops/wrapping.rs
@@ -1,4 +1,5 @@
 use std::ops::{Add, Sub, Mul};
+use std::num::Wrapping;
 
 macro_rules! wrapping_impl {
     ($trait_name:ident, $method:ident, $t:ty) => {
@@ -76,6 +77,23 @@ wrapping_impl!(WrappingMul, wrapping_mul, i32);
 wrapping_impl!(WrappingMul, wrapping_mul, i64);
 wrapping_impl!(WrappingMul, wrapping_mul, isize);
 
+// Well this is a bit funny, but all the more appropriate.
+impl<T: WrappingAdd> WrappingAdd for Wrapping<T> where Wrapping<T>: Add<Output = Wrapping<T>> {
+    fn wrapping_add(&self, v: &Self) -> Self {
+        Wrapping(self.0.wrapping_add(&v.0))
+    }
+}
+impl<T: WrappingSub> WrappingSub for Wrapping<T> where Wrapping<T>: Sub<Output = Wrapping<T>> {
+    fn wrapping_sub(&self, v: &Self) -> Self {
+        Wrapping(self.0.wrapping_sub(&v.0))
+    }
+}
+impl<T: WrappingMul> WrappingMul for Wrapping<T> where Wrapping<T>: Mul<Output = Wrapping<T>> {
+    fn wrapping_mul(&self, v: &Self) -> Self {
+        Wrapping(self.0.wrapping_mul(&v.0))
+    }
+}
+
 
 #[test]
 fn test_wrapping_traits() {