From d0ac326944e6a9df3322533468b61c0d3559fd4e Mon Sep 17 00:00:00 2001
From: Timothy Warren <twarren@nabancard.com>
Date: Fri, 6 Mar 2020 12:26:15 -0500
Subject: [PATCH] Add negation operator for Sign

---
 src/num.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/num.rs b/src/num.rs
index dac4372..25a0450 100644
--- a/src/num.rs
+++ b/src/num.rs
@@ -7,7 +7,7 @@ use core::convert::TryFrom;
 use core::fmt::Debug;
 use core::ops::{
     Add, AddAssign, BitAnd, BitAndAssign, BitOr, BitOrAssign, BitXor, BitXorAssign, Div, DivAssign,
-    Mul, MulAssign, Not, Rem, RemAssign, Shl, ShlAssign, Shr, ShrAssign, Sub, SubAssign,
+    Mul, MulAssign, Neg, Not, Rem, RemAssign, Shl, ShlAssign, Shr, ShrAssign, Sub, SubAssign,
 };
 
 /// Represents the sign of a rational number
@@ -27,8 +27,16 @@ impl Default for Sign {
     }
 }
 
+impl Neg for Sign {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        !self
+    }
+}
+
 impl Not for Sign {
-    type Output = Sign;
+    type Output = Self;
 
     fn not(self) -> Self::Output {
         match self {