Add 'Rank::{up,down}'
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@ -54,6 +54,18 @@ impl Rank {
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self as usize
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self as usize
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}
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}
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/// Return the [Rank] one-row up, as seen from white's perspective. Wraps around the board.
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pub fn up(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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/// Return the [Rank] one-row down, as seen from white's perspective. Wraps around the board.
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pub fn down(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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/// Turn a [Rank] into a [Bitboard] of all squares in that rank.
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/// Turn a [Rank] into a [Bitboard] of all squares in that rank.
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#[inline(always)]
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#[inline(always)]
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pub fn into_bitboard(self) -> Bitboard {
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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!(Rank::Eighth.index(), 7);
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assert_eq!(Rank::Eighth.index(), 7);
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}
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}
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#[test]
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fn up() {
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assert_eq!(Rank::First.up(), Rank::Second);
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assert_eq!(Rank::Second.up(), Rank::Third);
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assert_eq!(Rank::Eighth.up(), Rank::First);
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}
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#[test]
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fn down() {
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assert_eq!(Rank::First.down(), Rank::Eighth);
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assert_eq!(Rank::Second.down(), Rank::First);
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assert_eq!(Rank::Eighth.down(), Rank::Seventh);
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}
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#[test]
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#[test]
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fn into_bitboard() {
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fn into_bitboard() {
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assert_eq!(Rank::First.into_bitboard(), Bitboard::RANKS[0]);
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assert_eq!(Rank::First.into_bitboard(), Bitboard::RANKS[0]);
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