From aa5071576401aef89d1dd372e8781a7eab104a5d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Manuel=20B=C3=A4renz?= <m.baerenz@sonnen.de>
Date: Wed, 16 Mar 2022 15:16:16 +0100
Subject: [PATCH] Implement Inv impl for Decimal (#494)

---
 src/arithmetic_impls.rs | 11 ++++++++++-
 tests/decimal_tests.rs  |  7 ++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/arithmetic_impls.rs b/src/arithmetic_impls.rs
index c51b6ebe..8600d4fe 100644
--- a/src/arithmetic_impls.rs
+++ b/src/arithmetic_impls.rs
@@ -3,7 +3,7 @@
 
 use crate::{decimal::CalculationResult, ops, Decimal};
 use core::ops::{Add, Div, Mul, Rem, Sub};
-use num_traits::{CheckedAdd, CheckedDiv, CheckedMul, CheckedRem, CheckedSub};
+use num_traits::{CheckedAdd, CheckedDiv, CheckedMul, CheckedRem, CheckedSub, Inv};
 
 // Macros and `Decimal` implementations
 
@@ -198,6 +198,15 @@ impl CheckedRem for Decimal {
     }
 }
 
+impl Inv for Decimal {
+    type Output = Self;
+
+    #[inline]
+    fn inv(self) -> Self {
+        Decimal::ONE / self
+    }
+}
+
 forward_all_binop!(impl Div for Decimal, div);
 impl<'a, 'b> Div<&'b Decimal> for &'a Decimal {
     type Output = Decimal;
diff --git a/tests/decimal_tests.rs b/tests/decimal_tests.rs
index 8cf0e211..667b80f2 100644
--- a/tests/decimal_tests.rs
+++ b/tests/decimal_tests.rs
@@ -5,7 +5,7 @@ use core::{
     convert::{TryFrom, TryInto},
     str::FromStr,
 };
-use num_traits::{Signed, ToPrimitive};
+use num_traits::{Inv, Signed, ToPrimitive};
 use rust_decimal::{Decimal, Error, RoundingStrategy};
 
 #[test]
@@ -3366,6 +3366,11 @@ fn test_constants() {
     assert_eq!("2", Decimal::TWO.to_string());
 }
 
+#[test]
+fn test_inv() {
+    assert_eq!("0.01", Decimal::ONE_HUNDRED.inv().to_string());
+}
+
 // Mathematical features
 #[cfg(feature = "maths")]
 mod maths {