Add 'File::{left,right}'
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@ -54,6 +54,18 @@ impl File {
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self as usize
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}
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/// Return the [File] to the left, as seen from white's perspective. Wraps around the board.
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pub fn left(self) -> Self {
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// SAFETY: we know the value is in-bounds, through masking
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unsafe { Self::from_index_unchecked(self.index().wrapping_sub(1) & 7) }
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}
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/// Return the [File] to the right, as seen from white's perspective. Wraps around the board.
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pub fn right(self) -> Self {
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// SAFETY: we know the value is in-bounds, through masking
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unsafe { Self::from_index_unchecked(self.index().wrapping_add(1) & 7) }
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}
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/// Turn a [File] into a [Bitboard] of all squares in that file.
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#[inline(always)]
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pub fn into_bitboard(self) -> Bitboard {
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@ -80,6 +92,20 @@ mod test {
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assert_eq!(File::H.index(), 7);
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}
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#[test]
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fn left() {
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assert_eq!(File::A.left(), File::H);
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assert_eq!(File::B.left(), File::A);
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assert_eq!(File::H.left(), File::G);
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}
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#[test]
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fn right() {
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assert_eq!(File::A.right(), File::B);
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assert_eq!(File::B.right(), File::C);
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assert_eq!(File::H.right(), File::A);
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}
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#[test]
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fn into_bitboard() {
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assert_eq!(File::A.into_bitboard(), Bitboard::FILES[0]);
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