[Board] Add method to print BitBoard

Board.cpp

@@ -5,6 +5,7 @@
 #include <cmath>
 #include <bitset>
 #include <algorithm>
+#include <iostream>
 
 Board::Board() {
 }
@@ -108,13 +109,25 @@ void Board::makeMove(const Move &move) {
         }
     }
 
-    // en passant
+    handleEnPassant(move, movedPiece);
+
     handlePawnDoubleAdvance(move, toBB, movedPiece);
 
 
     // change turn
     mTurn = !mTurn;
 }
+void Board::handleEnPassant(const Move &move, const Piece &movedPiece) {
+    if (movedPiece.type() == PieceType::Pawn && mEPS.has_value() && move.from().file() != move.to().file()) {
+        auto epBB = indexToBitBoard(Square::fromCoordinates(move.to().file(), move.from().rank())->index());
+        auto capturedPiece = Piece(!mTurn, PieceType::Pawn);
+
+        mPieceBBs[toIndex(capturedPiece.color())] ^= epBB;
+        mPieceBBs[toIndex(capturedPiece.type())] ^= epBB;
+        mOccupiedBB ^= epBB;
+    }
+}
+
 void Board::handlePawnDoubleAdvance(const Move &move, BitBoard bb, const Piece &movedPiece) {
     if (movedPiece.type() == PieceType::Pawn) {
         auto fromR = move.from().rank();
@@ -185,6 +198,24 @@ bool Board::isMoveCastling(const BitBoard &from, const BitBoard &to, const Piece
 
     return (from & indexToBitBoard(E8));
 }
+void Board::printBitBoard(const Board::BitBoard &bb) {
+    // For debugging only, performance isn't important
+    for (int i = 7; i >= 0; i--) {
+        int rank = i * 8;
+        for (int j = 0; j < 8; j++) {
+            // Get the piece for this index. Assume it exists.
+            // Print piece, otherwise '.';
+            if (bb & (1ULL << (rank + j))) {
+                std::cout << 1;
+            } else {
+                std::cout << '.';
+            }
+
+            std::cout << ' ';
+        }
+        std::cout << '\n';
+    }
+}
 
 std::ostream &operator<<(std::ostream &os, const Board &board) {
     // For debugging only, performance isn't important

Board.hpp

@@ -127,7 +127,9 @@ private:
         return __builtin_ctzll(b);
     }
 
+    static void printBitBoard(const BitBoard &bb);
     void handlePawnDoubleAdvance(const Move &move, BitBoard bb, const Piece &movedPiece);
+    void handleEnPassant(const Move &move, const Piece &movedPiece);
 };
 
 std::ostream &operator<<(std::ostream &os, const Board &board);