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Add element iterator for ChunkedBitSet
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@ -479,6 +479,11 @@ impl<T: Idx> ChunkedBitSet<T> {
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}
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}
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#[inline]
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pub fn iter(&self) -> ChunkedBitIter<'_, T> {
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ChunkedBitIter::new(self)
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}
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/// Insert `elem`. Returns whether the set has changed.
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pub fn insert(&mut self, elem: T) -> bool {
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assert!(elem.index() < self.domain_size);
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@ -697,6 +702,49 @@ impl<T> Clone for ChunkedBitSet<T> {
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}
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}
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pub struct ChunkedBitIter<'a, T: Idx> {
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index: usize,
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bitset: &'a ChunkedBitSet<T>,
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}
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impl<'a, T: Idx> ChunkedBitIter<'a, T> {
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#[inline]
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fn new(bitset: &'a ChunkedBitSet<T>) -> ChunkedBitIter<'a, T> {
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ChunkedBitIter { index: 0, bitset }
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}
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}
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impl<'a, T: Idx> Iterator for ChunkedBitIter<'a, T> {
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type Item = T;
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fn next(&mut self) -> Option<T> {
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while self.index < self.bitset.domain_size() {
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let elem = T::new(self.index);
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let chunk = &self.bitset.chunks[chunk_index(elem)];
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match &chunk {
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Zeros(chunk_domain_size) => {
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self.index += *chunk_domain_size as usize;
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}
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Ones(_chunk_domain_size) => {
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self.index += 1;
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return Some(elem);
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}
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Mixed(_chunk_domain_size, _, words) => loop {
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let elem = T::new(self.index);
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self.index += 1;
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let (word_index, mask) = chunk_word_index_and_mask(elem);
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if (words[word_index] & mask) != 0 {
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return Some(elem);
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}
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if self.index % CHUNK_BITS == 0 {
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break;
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}
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},
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}
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}
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None
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}
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}
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impl Chunk {
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#[cfg(test)]
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fn assert_valid(&self) {
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@ -342,6 +342,40 @@ fn chunked_bitset() {
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b10000b.assert_valid();
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}
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#[test]
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fn chunked_bitset_iter() {
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fn with_elements(elements: &[usize], domain_size: usize) -> ChunkedBitSet<usize> {
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let mut s = ChunkedBitSet::new_empty(domain_size);
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for &e in elements {
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s.insert(e);
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}
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s
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}
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// Empty
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let vec: Vec<usize> = Vec::new();
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let bit = with_elements(&vec, 9000);
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assert_eq!(vec, bit.iter().collect::<Vec<_>>());
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// Filled
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let n = 10000;
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let vec: Vec<usize> = (0..n).collect();
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let bit = with_elements(&vec, n);
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assert_eq!(vec, bit.iter().collect::<Vec<_>>());
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// Filled with trailing zeros
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let n = 10000;
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let vec: Vec<usize> = (0..n).collect();
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let bit = with_elements(&vec, 2 * n);
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assert_eq!(vec, bit.iter().collect::<Vec<_>>());
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// Mixed
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let n = 12345;
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let vec: Vec<usize> = vec![0, 1, 2, 2010, 2047, 2099, 6000, 6002, 6004];
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let bit = with_elements(&vec, n);
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assert_eq!(vec, bit.iter().collect::<Vec<_>>());
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}
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#[test]
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fn grow() {
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let mut set: GrowableBitSet<usize> = GrowableBitSet::with_capacity(65);
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