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[position] Implement Position::king_bitboard to easily get the king bitboard for a player

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Rewrite king_square() and is_king_in_check() in terms of king_bitboard().
This commit is contained in:
Eryn Wells 2024-01-30 08:36:03 -08:00
parent 357b811518
commit 26aedd8899
1 changed files with 7 additions and 4 deletions
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11
position/src/position/position.rs
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@ -235,13 +235,16 @@ impl Position {
}
pub(crate) fn is_king_in_check(&self) -> bool {
let sight_of_opposing_player = self.sight_of_player(self.color_to_move.other());
sight_of_opposing_player.is_set(self.king_square(self.color_to_move))
let danger_squares = self.king_danger(self.color_to_move);
(danger_squares & self.king_bitboard(self.color_to_move)).is_empty()
}
fn king_bitboard(&self, player: Color) -> &BitBoard {
self.pieces.bitboard_for_piece(&Piece::king(player))
}
pub(crate) fn king_square(&self, player: Color) -> Square {
self.pieces
.bitboard_for_piece(&Piece::king(player))
self.king_bitboard(player)
.occupied_squares()
.next()
.unwrap()