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Implement FusedIterator for Iter{Set,Unset}Bits #84

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Merged
vext01 merged 1 commit into from
Jul 8, 2025
Merged

Implement FusedIterator for Iter{Set,Unset}Bits #84

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21 changes: 20 additions & 1 deletion src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ use std::{
cmp::{min, PartialEq},
fmt::{self, Debug},
hash::{Hash, Hasher},
iter::{DoubleEndedIterator, FromIterator},
iter::{DoubleEndedIterator, FromIterator, FusedIterator},
mem::{replace, size_of},
ops::{
Bound::{Excluded, Included, Unbounded},
Expand Down Expand Up @@ -1182,6 +1182,8 @@ impl<T: Debug + PrimInt> DoubleEndedIterator for IterSetBits<'_, T> {
}
}

impl<T: Debug + PrimInt> FusedIterator for IterSetBits<'_, T> {}

#[derive(Clone)]
pub struct IterUnsetBits<'a, T: 'a> {
vob: &'a Vob<T>,
Expand Down Expand Up @@ -1260,6 +1262,8 @@ impl<T: Debug + PrimInt> DoubleEndedIterator for IterUnsetBits<'_, T> {
}
}

impl<T: Debug + PrimInt> FusedIterator for IterUnsetBits<'_, T> {}

impl<T: Debug + PrimInt> PartialEq for Vob<T> {
fn eq(&self, other: &Self) -> bool {
if self.len != other.len {
Expand Down Expand Up @@ -1914,6 +1918,21 @@ mod tests {
t(&v1, 128.., vec![129, 130, 256]);
}

#[test]
fn test_fused() {
let v1 = vob![true];
let mut i1 = v1.iter_set_bits(..);
assert!(i1.next().is_some());
assert!(i1.next().is_none());
assert!(i1.next().is_none());

let v2 = vob![false];
let mut i2 = v2.iter_unset_bits(..);
assert!(i2.next().is_some());
assert!(i2.next().is_none());
assert!(i2.next().is_none());
}

#[test]
fn test_eq() {
let v1 = Vob::from_iter(vec![true, false]);
Expand Down