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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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8
src/bitbase.cpp
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@@ -134,8 +134,8 @@ namespace {
return RESULT_INVALID;
// Check if a king can be captured
if ( bit_is_set(wk_attacks(), blackKingSquare)
|| (bit_is_set(pawn_attacks(), blackKingSquare) && sideToMove == WHITE))
if ( (wk_attacks() & blackKingSquare)
|| ((pawn_attacks() & blackKingSquare) && sideToMove == WHITE))
return RESULT_INVALID;
// The position is an immediate win if it is white to move and the
@@ -144,7 +144,7 @@ namespace {
&& sideToMove == WHITE
&& whiteKingSquare != pawnSquare + DELTA_N
&& ( square_distance(blackKingSquare, pawnSquare + DELTA_N) > 1
|| bit_is_set(wk_attacks(), pawnSquare + DELTA_N)))
|| (wk_attacks() & (pawnSquare + DELTA_N))))
return RESULT_WIN;
// Check for known draw positions
@@ -156,7 +156,7 @@ namespace {
// Case 2: King can capture pawn
if ( sideToMove == BLACK
&& bit_is_set(bk_attacks(), pawnSquare) && !bit_is_set(wk_attacks(), pawnSquare))
&& (bk_attacks() & pawnSquare) && !(wk_attacks() & pawnSquare))
return RESULT_DRAW;
// Case 3: Black king in front of white pawn