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Bitwise operator overloads between Bitboard and Square

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Yes, we try to be fancy here ;-)

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-01-29 09:54:17 +01:00
parent 875a8079bc
commit a492a9dd07
9 changed files with 98 additions and 112 deletions
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30
src/bitboard.h
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@@ -47,31 +47,19 @@ extern Bitboard AttackSpanMask[2][64];
extern Bitboard PseudoAttacks[6][64];
/// Functions 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 bit_is_set(Bitboard b, Square s) {
inline Bitboard operator&(Bitboard b, Square s) {
return b & SquareBB[s];
}
inline void set_bit(Bitboard* b, Square s) {
*b |= SquareBB[s];
inline Bitboard& operator|=(Bitboard& b, Square s) {
return b |= SquareBB[s], b;
}
inline void xor_bit(Bitboard* b, Square s) {
*b ^= SquareBB[s];
}
/// Functions used to update a bitboard after a move. This is faster
/// then calling a sequence of clear_bit() + set_bit()
inline Bitboard make_move_bb(Square from, Square to) {
return SquareBB[from] | SquareBB[to];
}
inline void do_move_bb(Bitboard* b, Bitboard move_bb) {
*b ^= move_bb;
inline Bitboard& operator^=(Bitboard& b, Square s) {
return b ^= SquareBB[s], b;
}
@@ -217,8 +205,8 @@ inline bool squares_aligned(Square s1, Square s2, Square s3) {
/// the same color of the given square.
inline Bitboard same_color_squares(Square s) {
return bit_is_set(0xAA55AA55AA55AA55ULL, s) ? 0xAA55AA55AA55AA55ULL
: ~0xAA55AA55AA55AA55ULL;
return Bitboard(0xAA55AA55AA55AA55ULL) & s ? 0xAA55AA55AA55AA55ULL
: ~0xAA55AA55AA55AA55ULL;
}