[Board] Implement MoveGenerator

Board.cpp

@@ -15,18 +15,18 @@ void Board::setPiece(const Square &square, const Piece::Optional &piece) {
         return;
 
     auto index = square.index();
-    for (auto &bb : mPieceBBs) {
-        bb.clear(index);
+    for (int i = 0; i < BB_NUM; i++) {
+        mPieceBBs[i].clear(index);
     }
 
     mPieceBBs[toIndex(piece->type())].set(index);
     mPieceBBs[toIndex(piece->color())].set(index);
-    mOccupiedBB.set(index);
+    (*mOccupiedBB).set(index);
 }
 
 Piece::Optional Board::piece(const Square &square) const {
     BitBoard mask = BitBoard::fromIndex(square.index());
-    if (!(mOccupiedBB & mask)) {
+    if (!(*mOccupiedBB & mask)) {
         return std::nullopt;
     }
 
@@ -68,17 +68,17 @@ void Board::makeMove(const Move &move) {
     BitBoard changeBB = fromBB ^ toBB;
 
     // If Piece is captured
-    if (mOccupiedBB & toBB) {
+    if (*mOccupiedBB & toBB) {
         auto capturedPiece = Piece(!mTurn, pieceType(toBB));
         mPieceBBs[toIndex(capturedPiece.color())] ^= toBB;
         mPieceBBs[toIndex(capturedPiece.type())] ^= toBB;
-        mOccupiedBB ^= fromBB;
+        *mOccupiedBB ^= fromBB;
 
         if (toBB & CastlingRanks) { // Check castling rights
             handleCastlingRights(capturedPiece, toBB);
         }
     } else {
-        mOccupiedBB ^= changeBB; // update occupied bitboard
+        *mOccupiedBB ^= changeBB; // update occupied bitboard
     }
 
     auto movedPiece = Piece(mTurn, pieceType(fromBB));
@@ -105,7 +105,7 @@ void Board::makeMove(const Move &move) {
 
             mPieceBBs[toIndex(PieceType::Rook)] ^= rookBB;
             mPieceBBs[toIndex(movedPiece.color())] ^= rookBB;
-            mOccupiedBB ^= rookBB;
+            *mOccupiedBB ^= rookBB;
         }
     }
 
@@ -124,7 +124,7 @@ void Board::handleEnPassant(const Move &move, const Piece &movedPiece) {
 
         mPieceBBs[toIndex(capturedPiece.color())] ^= epBB;
         mPieceBBs[toIndex(capturedPiece.type())] ^= epBB;
-        mOccupiedBB ^= epBB;
+        *mOccupiedBB ^= epBB;
     }
 }