position: Remove void Position::undo_move(Move m)

src/position.cpp

@@ -471,70 +471,6 @@ void Position::do_move(Move m)
 /// Position::undo_move() unmakes a move. When it returns, the position should
 /// be restored to exactly the same state as before the move was made.
 
-void Position::undo_move(Move m)
-{
-    assert(is_ok(m));
-
-#if 0
-    sideToMove = ~sideToMove;
-
-    Color us = sideToMove;
-    Square from = from_sq(m);
-    Square to = to_sq(m);
-    Piece pc = piece_on(to);
-
-    assert(empty(from));
-
-    {
-        move_piece(to, from); // Put the piece back at the source square
-
-        if (st.capturedPiece) {
-            Square capsq = to;
-
-            put_piece(st.capturedPiece, capsq); // Restore the captured piece
-        }
-    }
-#endif
-
-    bool ret = false;
-
-    // TODO Start
-    MoveType mt = type_of(m);
-
-    switch (mt) {
-    case MOVETYPE_REMOVE:
-        ret = put_piece(to_sq((Move)-m));
-        break;
-    case MOVETYPE_MOVE:
-        if (select_piece(to_sq(m))) {
-            ret = put_piece(from_sq(m));
-        }
-        break;
-    case MOVETYPE_PLACE:
-        ret = remove_piece(static_cast<Square>(m));
-        break;
-    default:
-        break;
-    }
-
-    if (!ret) {
-        return;
-    }
-
-    // TODO: Adjust
-    //int pieceInHandCount[COLOR_NB]{ 0 };
-    //int pieceOnBoardCount[COLOR_NB]{ 0 };
-    //int pieceToRemoveCount{ 0 };
-
-    // TODO End
-
-    // Finally point our state pointer back to the previous state
-    //st = st.previous;
-    --gamePly;
-
-    assert(pos_is_ok());
-}
-
 void Position::undo_move(Sanmill::Stack<Position> &ss)
 {
     memcpy(this, ss.top(), sizeof(Position));

src/position.h

@@ -76,7 +76,6 @@ public:
 
     // Doing and undoing moves
     void do_move(Move m);
-    void undo_move(Move m);
     void undo_move(Sanmill::Stack<Position> &ss);
 
     // Accessing hash keys