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15 lines
372 B
15 lines
372 B
// +build go1.9 |
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package chess |
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import "math/bits" |
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// Reverse returns a bitboard where the bit order is reversed. |
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func (b bitboard) Reverse() bitboard { |
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return bitboard(bits.Reverse64(uint64(b))) |
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} |
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// Occupied returns true if the square's bitboard position is 1. |
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func (b bitboard) Occupied(sq Square) bool { |
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return (bits.RotateLeft64(uint64(b), int(sq)+1) & 1) == 1 |
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}
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