Add 'ChessBoard::checkers'

This commit is contained in:
Bruno BELANYI 2022-07-30 12:02:41 +02:00
parent f582a76e70
commit 9dea85054d

View file

@ -112,6 +112,13 @@ impl ChessBoard {
self.total_plies
}
/// Return the [Bitboard] corresponding to all the opponent's pieces threatening the current
/// player's king.
#[inline(always)]
pub fn checkers(&self) -> Bitboard {
self.compute_checkers(self.current_player())
}
/// Quickly do and undo a move on the [Bitboard]s that are part of the [ChessBoard] state. Does
/// not account for all non-revertible changes such as en-passant state or half-move clock.
#[inline(always)]
@ -723,6 +730,49 @@ mod test {
assert!(!position.is_valid());
}
#[test]
fn checkers() {
let position = ChessBoard {
piece_occupancy: [
// King
Square::E2 | Square::E8,
// Queen
Square::E7 | Square::H2,
// Rook
Square::A2 | Square::E1,
// Bishop
Square::D3 | Square::F3,
// Knight
Square::C1 | Square::G1,
// Pawn
Bitboard::EMPTY,
],
color_occupancy: [
Square::C1 | Square::D3 | Square::E1 | Square::E2 | Square::H2,
Square::A2 | Square::E7 | Square::E8 | Square::F3 | Square::G1,
],
combined_occupancy: Square::A2
| Square::C1
| Square::D3
| Square::E1
| Square::E2
| Square::E7
| Square::E8
| Square::F3
| Square::G1
| Square::H2,
castle_rights: [CastleRights::NoSide; 2],
en_passant: None,
half_move_clock: 0,
total_plies: 0,
side: Color::White,
};
assert_eq!(
position.checkers(),
Square::A2 | Square::E7 | Square::F3 | Square::G1
);
}
#[test]
fn fen_default_position() {
let default_position = ChessBoard::default();