Implement CheckedNeg and CheckedRem

src/bigint.rs

@@ -11,7 +11,7 @@ use core::ops::{Neg, Not};
 use core::str;
 
 use num_integer::{Integer, Roots};
-use num_traits::{ConstZero, Num, One, Pow, Signed, Zero};
+use num_traits::{CheckedNeg, ConstZero, Num, One, Pow, Signed, Zero};
 
 use self::Sign::{Minus, NoSign, Plus};
 
@@ -344,6 +344,13 @@ impl Neg for &BigInt {
     }
 }
 
+impl CheckedNeg for BigInt {
+    #[inline]
+    fn checked_neg(&self) -> Option<BigInt> {
+        Some(self.neg())
+    }
+}
+
 impl Integer for BigInt {
     #[inline]
     fn div_rem(&self, other: &BigInt) -> (BigInt, BigInt) {

src/bigint/division.rs

@@ -6,7 +6,7 @@ use crate::{IsizePromotion, UsizePromotion};
 
 use core::ops::{Div, DivAssign, Rem, RemAssign};
 use num_integer::Integer;
-use num_traits::{CheckedDiv, CheckedEuclid, Euclid, Signed, ToPrimitive, Zero};
+use num_traits::{CheckedDiv, CheckedEuclid, CheckedRem, Euclid, Signed, ToPrimitive, Zero};
 
 forward_all_binop_to_ref_ref!(impl Div for BigInt, div);
 
@@ -447,6 +447,16 @@ impl CheckedDiv for BigInt {
     }
 }
 
+impl CheckedRem for BigInt {
+    #[inline]
+    fn checked_rem(&self, v: &BigInt) -> Option<BigInt> {
+        if v.is_zero() {
+            return None;
+        }
+        Some(self.rem(v))
+    }
+}
+
 impl CheckedEuclid for BigInt {
     #[inline]
     fn checked_div_euclid(&self, v: &BigInt) -> Option<BigInt> {

src/biguint/division.rs

@@ -10,7 +10,7 @@ use core::cmp::Ordering::{Equal, Greater, Less};
 use core::mem;
 use core::ops::{Div, DivAssign, Rem, RemAssign};
 use num_integer::Integer;
-use num_traits::{CheckedDiv, CheckedEuclid, Euclid, ToPrimitive, Zero};
+use num_traits::{CheckedDiv, CheckedEuclid, CheckedRem, Euclid, ToPrimitive, Zero};
 
 pub(super) const FAST_DIV_WIDE: bool = cfg!(any(target_arch = "x86", target_arch = "x86_64"));
 
@@ -784,6 +784,16 @@ impl CheckedDiv for BigUint {
     }
 }
 
+impl CheckedRem for BigUint {
+    #[inline]
+    fn checked_rem(&self, v: &BigUint) -> Option<BigUint> {
+        if v.is_zero() {
+            return None;
+        }
+        Some(self.rem(v))
+    }
+}
+
 impl CheckedEuclid for BigUint {
     #[inline]
     fn checked_div_euclid(&self, v: &BigUint) -> Option<BigUint> {