extern Bitboard PawnAttacks[COLOR_NB][SQUARE_NB];
-/// Magic holds all magic bitboards relevant data for a single square
+// Magic holds all magic bitboards relevant data for a single square
struct Magic {
Bitboard mask;
Bitboard magic;
}
-/// Overloads of bitwise operators between a Bitboard and a Square for testing
-/// whether a given bit is set in a bitboard, and for setting and clearing bits.
+// Overloads of bitwise operators between a Bitboard and a Square for testing
+// whether a given bit is set in a bitboard, and for setting and clearing bits.
inline Bitboard operator&( Bitboard b, Square s) { return b & square_bb(s); }
inline Bitboard operator|( Bitboard b, Square s) { return b | square_bb(s); }
}
-/// rank_bb() and file_bb() return a bitboard representing all the squares on
-/// the given file or rank.
+// rank_bb() and file_bb() return a bitboard representing all the squares on
+// the given file or rank.
constexpr Bitboard rank_bb(Rank r) {
return Rank1BB << (8 * r);
}
-/// shift() moves a bitboard one or two steps as specified by the direction D
+// shift() moves a bitboard one or two steps as specified by the direction D
template<Direction D>
constexpr Bitboard shift(Bitboard b) {
}
-/// pawn_attacks_bb() returns the squares attacked by pawns of the given color
-/// from the squares in the given bitboard.
+// pawn_attacks_bb() returns the squares attacked by pawns of the given color
+// from the squares in the given bitboard.
template<Color C>
constexpr Bitboard pawn_attacks_bb(Bitboard b) {
return PawnAttacks[c][s];
}
-/// line_bb() returns a bitboard representing an entire line (from board edge
-/// to board edge) that intersects the two given squares. If the given squares
-/// are not on a same file/rank/diagonal, the function returns 0. For instance,
-/// line_bb(SQ_C4, SQ_F7) will return a bitboard with the A2-G8 diagonal.
+// line_bb() returns a bitboard representing an entire line (from board edge
+// to board edge) that intersects the two given squares. If the given squares
+// are not on a same file/rank/diagonal, the function returns 0. For instance,
+// line_bb(SQ_C4, SQ_F7) will return a bitboard with the A2-G8 diagonal.
inline Bitboard line_bb(Square s1, Square s2) {
}
-/// between_bb(s1, s2) returns a bitboard representing the squares in the semi-open
-/// segment between the squares s1 and s2 (excluding s1 but including s2). If the
-/// given squares are not on a same file/rank/diagonal, it returns s2. For instance,
-/// between_bb(SQ_C4, SQ_F7) will return a bitboard with squares D5, E6 and F7, but
-/// between_bb(SQ_E6, SQ_F8) will return a bitboard with the square F8. This trick
-/// allows to generate non-king evasion moves faster: the defending piece must either
-/// interpose itself to cover the check or capture the checking piece.
+// between_bb(s1, s2) returns a bitboard representing the squares in the semi-open
+// segment between the squares s1 and s2 (excluding s1 but including s2). If the
+// given squares are not on a same file/rank/diagonal, it returns s2. For instance,
+// between_bb(SQ_C4, SQ_F7) will return a bitboard with squares D5, E6 and F7, but
+// between_bb(SQ_E6, SQ_F8) will return a bitboard with the square F8. This trick
+// allows to generate non-king evasion moves faster: the defending piece must either
+// interpose itself to cover the check or capture the checking piece.
inline Bitboard between_bb(Square s1, Square s2) {
return BetweenBB[s1][s2];
}
-/// aligned() returns true if the squares s1, s2 and s3 are aligned either on a
-/// straight or on a diagonal line.
+// aligned() returns true if the squares s1, s2 and s3 are aligned either on a
+// straight or on a diagonal line.
inline bool aligned(Square s1, Square s2, Square s3) {
return line_bb(s1, s2) & s3;
}
-/// distance() functions return the distance between x and y, defined as the
-/// number of steps for a king in x to reach y.
+// distance() functions return the distance between x and y, defined as the
+// number of steps for a king in x to reach y.
template<typename T1 = Square> inline int distance(Square x, Square y);
template<> inline int distance<File>(Square x, Square y) { return std::abs(file_of(x) - file_of(y)); }
inline int edge_distance(File f) { return std::min(f, File(FILE_H - f)); }
-/// attacks_bb(Square) returns the pseudo attacks of the given piece type
-/// assuming an empty board.
+// attacks_bb(Square) returns the pseudo attacks of the given piece type
+// assuming an empty board.
template<PieceType Pt>
inline Bitboard attacks_bb(Square s) {
}
-/// attacks_bb(Square, Bitboard) returns the attacks by the given piece
-/// assuming the board is occupied according to the passed Bitboard.
-/// Sliding piece attacks do not continue passed an occupied square.
+// attacks_bb(Square, Bitboard) returns the attacks by the given piece
+// assuming the board is occupied according to the passed Bitboard.
+// Sliding piece attacks do not continue passed an occupied square.
template<PieceType Pt>
inline Bitboard attacks_bb(Square s, Bitboard occupied) {
}
-/// popcount() counts the number of non-zero bits in a bitboard
+// popcount() counts the number of non-zero bits in a bitboard
inline int popcount(Bitboard b) {
}
-/// lsb() and msb() return the least/most significant bit in a non-zero bitboard
+// lsb() and msb() return the least/most significant bit in a non-zero bitboard
#if defined(__GNUC__) // GCC, Clang, ICX
#endif
-/// least_significant_square_bb() returns the bitboard of the least significant
-/// square of a non-zero bitboard. It is equivalent to square_bb(lsb(bb)).
+// least_significant_square_bb() returns the bitboard of the least significant
+// square of a non-zero bitboard. It is equivalent to square_bb(lsb(bb)).
inline Bitboard least_significant_square_bb(Bitboard b) {
assert(b);
return b & -b;
}
-/// pop_lsb() finds and clears the least significant bit in a non-zero bitboard
+// pop_lsb() finds and clears the least significant bit in a non-zero bitboard
inline Square pop_lsb(Bitboard& b) {
assert(b);
projects / stockfish / blobdiff