From 7d538c830d301c97a56a133cec0beeeffe1be4af Mon Sep 17 00:00:00 2001
From: "Tobin C. Harding" <me@tobin.cc>
Date: Mon, 12 Feb 2024 13:04:26 +1100
Subject: [PATCH] units: Implement ops::Neg for SignedAmount

Its useful to be able to do `let x = -btc_amount;`

Implement `core::ops::Neg for SignedAmount`, returning a `SignedAmount`.

Fix: #2470
---
 units/src/amount.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/units/src/amount.rs b/units/src/amount.rs
index 92f6ef76..87369d02 100644
--- a/units/src/amount.rs
+++ b/units/src/amount.rs
@@ -1328,6 +1328,12 @@ impl ops::DivAssign<i64> for SignedAmount {
     fn div_assign(&mut self, rhs: i64) { *self = *self / rhs }
 }
 
+impl ops::Neg for SignedAmount {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output { Self(self.0.neg()) }
+}
+
 impl FromStr for SignedAmount {
     type Err = ParseError;