[BitBoard] Add fills and direction methods

BitBoard.cpp

@@ -31,3 +31,23 @@ BitBoard BitBoard::getRank(int r) {
 BitBoard BitBoard::genShift(BitBoard x, const int s) {
     return (s < 0) ? (x >> -s) : (s > 63) ? x : (x << s);
 }
+
+BitBoard BitBoard::northFill() const {
+    BitBoard result(mBoard);
+    result |= (result << 8);
+    result |= (result << 16);
+    result |= (result << 32);
+    return (result << 8);
+}
+
+BitBoard BitBoard::southFill() const {
+    BitBoard result(mBoard);
+    result |= (result >> 8);
+    result |= (result >> 16);
+    result |= (result >> 32);
+    return result;
+}
+
+BitBoard BitBoard::fileFill() const {
+    return northFill() | southFill();
+}

BitBoard.h

@@ -82,8 +82,18 @@ public:
     constexpr void clear(unsigned i);
     constexpr void set(unsigned i);
 
-    BitBoard left(unsigned i) const;
-    BitBoard right(unsigned i) const;
+    BitBoard north() const;
+    BitBoard northEast() const;
+    BitBoard northWest() const;
+    BitBoard east() const;
+    BitBoard south() const;
+    BitBoard southEast() const;
+    BitBoard southWest() const;
+    BitBoard west() const;
+
+    BitBoard northFill() const;
+    BitBoard southFill() const;
+    BitBoard fileFill() const;
 
     static BitBoard fromIndex(unsigned i);
 
@@ -215,11 +225,30 @@ constexpr void BitBoard::clear(const unsigned i) {
 inline BitBoard BitBoard::fromIndex(const unsigned i) {
     return 1ULL << i;
 }
-inline BitBoard BitBoard::left(const unsigned int i) const {
-    return (mBoard >> i);
+
+inline BitBoard BitBoard::north() const {
+    return (mBoard << 8);
 }
-inline BitBoard BitBoard::right(const unsigned int i) const {
-    return (mBoard << i);
+inline BitBoard BitBoard::northEast() const {
+    return (mBoard << 9) & ~AFile;
+}
+inline BitBoard BitBoard::northWest() const {
+    return (mBoard << 7) & ~HFile;
+}
+inline BitBoard BitBoard::west() const {
+    return (mBoard >> 1) & ~HFile;
+}
+inline BitBoard BitBoard::east() const {
+    return (mBoard << 1) & ~AFile;
+}
+inline BitBoard BitBoard::south() const {
+    return (mBoard >> 8);
+}
+inline BitBoard BitBoard::southEast() const {
+    return (mBoard >> 7) & ~AFile;
+}
+inline BitBoard BitBoard::southWest() const {
+    return (mBoard >> 9) & ~HFile;
 }
 inline int BitBoard::lsb() const {
     return __builtin_ctzll(mBoard);

Board.cpp

@@ -133,10 +133,8 @@ void Board::handlePawnDoubleAdvance(const Move &move, BitBoard bb, const Piece &
         auto fromR = move.from().rank();
         auto toR = move.to().rank();
         if (abs(static_cast<int>(fromR) - static_cast<int>(toR)) == 2) {
-            if (mPieceBBs[toIndex(PieceType::Pawn)]
-                    & (bb.left(1) | bb.right(1))
-                    & BitBoard::getRank(static_cast<int>(toR))) {
-
+            if (mPieceBBs[toIndex(PieceType::Pawn)] & mPieceBBs[toIndex(!mTurn)] // Get all other color pawns
+                    & (bb.west() | bb.east())) { // is pawn left or right?
                 mEPS = Square::fromCoordinates(move.to().file(), std::max(fromR, toR) - 1);
                 return;
             }
@@ -151,8 +149,7 @@ void Board::pseudoLegalMoves(MoveVec &moves) const {
     (void) moves;
 }
 
-void Board::pseudoLegalMovesFrom(const Square &from,
-                                 Board::MoveVec &moves) const {
+void Board::pseudoLegalMovesFrom(const Square &from, Board::MoveVec &moves) const {
     (void) from;
     (void) moves;
 }