From 3e8c67506a6afdb0c102f016462379557e4f8f47 Mon Sep 17 00:00:00 2001
From: Kaido Kert <kaidokert@gmail.com>
Date: Fri, 14 Feb 2025 16:42:24 -0800
Subject: [PATCH] Add OverflowingAdd and OverflowingSub impls

---
 src/bint/numtraits.rs  | 1 +
 src/buint/numtraits.rs | 2 ++
 src/int/numtraits.rs   | 9 +++++++++
 3 files changed, 12 insertions(+)

diff --git a/src/bint/numtraits.rs b/src/bint/numtraits.rs
index 9114711..5483b51 100644
--- a/src/bint/numtraits.rs
+++ b/src/bint/numtraits.rs
@@ -164,6 +164,7 @@ use num_traits::{
     Saturating, SaturatingAdd, SaturatingMul, SaturatingSub, Signed, ToPrimitive, WrappingAdd,
     WrappingMul, WrappingNeg, WrappingShl, WrappingShr, WrappingSub, Zero, //ConstZero
 };
+use num_traits::ops::overflowing::{OverflowingAdd, OverflowingSub};
 
 use crate::cast::CastFrom;
 use crate::int::numtraits::num_trait_impl;
diff --git a/src/buint/numtraits.rs b/src/buint/numtraits.rs
index 5a13eac..b47f526 100644
--- a/src/buint/numtraits.rs
+++ b/src/buint/numtraits.rs
@@ -58,6 +58,8 @@ use num_traits::{
     Saturating, SaturatingAdd, SaturatingMul, SaturatingSub, ToPrimitive, Unsigned, WrappingAdd,
     WrappingMul, WrappingNeg, WrappingShl, WrappingShr, WrappingSub, Zero, //ConstZero
 };
+use num_traits::ops::overflowing::{OverflowingAdd, OverflowingSub};
+
 
 use crate::cast::CastFrom;
 use crate::int::numtraits::num_trait_impl;
diff --git a/src/int/numtraits.rs b/src/int/numtraits.rs
index 3c2333a..e16adc4 100644
--- a/src/int/numtraits.rs
+++ b/src/int/numtraits.rs
@@ -69,6 +69,9 @@ macro_rules! impls {
         num_trait_impl!($Int, WrappingMul, wrapping_mul, Self);
         num_trait_impl!($Int, WrappingSub, wrapping_sub, Self);
 
+        num_trait_impl!($Int, OverflowingAdd, overflowing_add, (Self, bool));
+        num_trait_impl!($Int, OverflowingSub, overflowing_sub, (Self, bool));
+
         impl<const N: usize> CheckedNeg for $Int<N> {
             #[inline]
             fn checked_neg(&self) -> Option<Self> {
@@ -427,9 +430,15 @@ macro_rules! tests {
         test_bignum! {
             function: <$int as WrappingAdd>::wrapping_add(a: ref &$int, b: ref &$int)
         }
+        test_bignum! {
+            function: <$int as OverflowingAdd>::overflowing_add(a: ref &$int, b: ref &$int)
+        }
         test_bignum! {
             function: <$int as WrappingSub>::wrapping_sub(a: ref &$int, b: ref &$int)
         }
+        test_bignum! {
+            function: <$int as OverflowingSub>::overflowing_sub(a: ref &$int, b: ref &$int)
+        }
         test_bignum! {
             function: <$int as WrappingMul>::wrapping_mul(a: ref &$int, b: ref &$int)
         }