API changes: extend visitor with return values #901
Description
If you try to build a CopyVisitor of some kind of object hierarchy, one has to build some kind of Stack structure, to give the actual visitor a hint, where it should write its copied data.
I suggest to extend all visitor methods with a return value:
MyType visitor(MyType param);
The standard implementation should return the actual object inserted.
public interface StatementVisitor {
Comment visit(Comment comment);
Commit visit(Commit commit);
Delete visit(Delete delete);
Update visit(Update update);