Implement negation for wrapping numerals.

notriddle · notriddle · commit 8a8c432f7471 · 2016-04-20T15:23:24.000-07:00
Fixes #33037
diff --git a/src/libcore/num/wrapping.rs b/src/libcore/num/wrapping.rs
@@ -275,6 +275,15 @@ macro_rules! wrapping_impl {
                 *self = *self & other;
             }
         }
+
+        #[stable(feature = "wrapping_neg", since = "1.10.0")]
+        impl Neg for Wrapping<$t> {
+            type Output = Self;
+            #[inline(always)]
+            fn neg(self) -> Self {
+                Wrapping(0) - self
+            }
+        }
     )*)
 }
 

Original file line number	Diff line number	Diff line change
`@@ -275,6 +275,15 @@ macro_rules! wrapping_impl {`
`275`	`275`	`self = self & other;`
`276`	`276`	`}`
`277`	`277`	`}`
	`278`	`+`
	`279`	`+ #[stable(feature = "wrapping_neg", since = "1.10.0")]`
	`280`	`+ impl Neg for Wrapping<$t> {`
	`281`	`+ type Output = Self;`
	`282`	`+ #[inline(always)]`
	`283`	`+ fn neg(self) -> Self {`
	`284`	`+ Wrapping(0) - self`
	`285`	`+ }`
	`286`	`+ }`
`278`	`287`	`)*)`
`279`	`288`	`}`
`280`	`289`