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fix lstrip in biguint (#6151)

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* add failing test for multiply_by_rational

* fix BigUint

* fix length

* bump version

* merge tests
This commit is contained in:
Xiliang Chen
2020-05-27 20:18:53 +12:00
committed by GitHub
parent 1ea45a541e
commit c46b2020f2
3 changed files with 15 additions and 6 deletions
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substrate/primitives/arithmetic/src/biguint.rs
+5 -5
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@@ -151,7 +151,7 @@ impl BigUint {
// has the ability to cause this. There is nothing to do if the number already has 1
// limb only. call it a day and return.
if self.len().is_zero() { return; }
let index = self.digits.iter().position(|&elem| elem != 0).unwrap_or(0);
let index = self.digits.iter().position(|&elem| elem != 0).unwrap_or(self.len() - 1);
if index > 0 {
self.digits = self.digits[index..].to_vec()
@@ -581,19 +581,19 @@ pub mod tests {
fn strip_works() {
let mut a = BigUint::from_limbs(&[0, 1, 0]);
a.lstrip();
assert_eq!(a, BigUint { digits: vec![1, 0] });
assert_eq!(a.digits, vec![1, 0]);
let mut a = BigUint::from_limbs(&[0, 0, 1]);
a.lstrip();
assert_eq!(a, BigUint { digits: vec![1] });
assert_eq!(a.digits, vec![1]);
let mut a = BigUint::from_limbs(&[0, 0]);
a.lstrip();
assert_eq!(a, BigUint { digits: vec![0] });
assert_eq!(a.digits, vec![0]);
let mut a = BigUint::from_limbs(&[0, 0, 0]);
a.lstrip();
assert_eq!(a, BigUint { digits: vec![0] });
assert_eq!(a.digits, vec![0]);
}
#[test]