U64 hash_key(const board_t *board) {
ASSERT(board != nullptr);
// init
U64 key = 0;
// pieces
for (S8 colour = 0; colour < ColourNb; ++colour) {
for (auto sq = board->piece[colour].begin(); sq != board->piece[colour].end(); ++sq) {
const S32 piece = board->square[*sq];
key ^= hash_piece_key(piece, *sq);
}
for (auto sq = board->pawn[colour].begin(); sq != board->pawn[colour].end(); ++sq) {
const S32 piece = board->square[*sq];
key ^= hash_piece_key(piece, *sq);
}
}
// castle flags
key ^= hash_castle_key(board->flags);
// en-passant square
const S32 sq = board->ep_square;
if (sq != SquareNone) key ^= hash_ep_key(sq);
// turn
key ^= hash_turn_key(board->turn);
return key;
}
uint64 hash_key( board_t *board )
{
uint64 key;
int sq, piece;
int index;
ASSERT(board != NULL);
// init
key = 0;
// pieces
for (index = 1; index <= 32; ++index)
{
sq = board->piece[index];
if (sq != SquareNone)
{
piece= INDEX_TO_PIECE(index);
key ^= hash_piece_key(piece, SQUARE_TO_90(sq));
}
}
// turn
key ^= hash_turn_key(board->turn);
return key;
}
uint64 hash_key(const board_t * board) {
uint64 key;
int colour;
const sq_t * ptr;
int sq, piece;
ASSERT(board!=NULL);
// init
key = 0;
// pieces
for (colour = 0; colour < ColourNb; colour++) {
for (ptr = &board->piece[colour][0]; (sq=*ptr) != SquareNone; ptr++) {
piece = board->square[sq];
key ^= hash_piece_key(piece,sq);
}
for (ptr = &board->pawn[colour][0]; (sq=*ptr) != SquareNone; ptr++) {
piece = board->square[sq];
key ^= hash_piece_key(piece,sq);
}
}
// castle flags
key ^= hash_castle_key(board->flags);
// en-passant square
sq = board->ep_square;
if (sq != SquareNone) key ^= hash_ep_key(sq);
// turn
key ^= hash_turn_key(board->turn);
return key;
}
U64 hash_pawn_key(const board_t *board) {
ASSERT(board != nullptr);
// init
U64 key = 0;
// pawns
for (S8 colour = 0; colour < ColourNb; ++colour) {
for (auto sq = board->pawn[colour].begin(); sq != board->pawn[colour].end(); ++sq) {
const S32 piece = board->square[*sq];
key ^= hash_piece_key(piece, *sq);
}
}
return key;
}
uint64 hash_pawn_key(const board_t * board) {
uint64 key;
int colour;
const sq_t * ptr;
int sq, piece;
ASSERT(board!=NULL);
// init
key = 0;
// pawns
for (colour = 0; colour < ColourNb; colour++) {
for (ptr = &board->pawn[colour][0]; (sq=*ptr) != SquareNone; ptr++) {
piece = board->square[sq];
key ^= hash_piece_key(piece,sq);
}
}
return key;
}
