29 lines
832 B
Rust
29 lines
832 B
Rust
/// An [Iterator](std::iter::Iterator) of [Square](crate::board::Square) contained in a
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/// [Bitboard](crate::board::Bitboard).
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pub struct BitboardIterator(pub(crate) u64);
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impl Iterator for BitboardIterator {
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type Item = crate::board::Square;
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fn next(&mut self) -> Option<Self::Item> {
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if self.0 == 0 {
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None
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} else {
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let lsb = self.0.trailing_zeros() as usize;
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self.0 ^= 1 << lsb;
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// SAFETY: we know the value is in-bounds
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Some(unsafe { crate::board::Square::from_index_unchecked(lsb) })
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}
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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let size = self.0.count_ones() as usize;
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(size, Some(size))
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}
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}
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impl ExactSizeIterator for BitboardIterator {}
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impl std::iter::FusedIterator for BitboardIterator {}
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