[antlr-interest] Using an AST Type with a TreeParser

[Allan Brock]

I'm replacing the AST type with MyAST (based on the treewalk example in
antlr2.7.6) in order to get line numbers. I've gotten everything to work,
but have run into a couple problems that I used to a casts to overcome.  I'm
wondering if there is a simpler answer.

In my application, the Parser produces an AST using  type MyAST.  This is
walked by a TreeParser (MyTreeParser)  that also produces an AST using type
MyAST.  Everything seems fine with the parser.

But in MyTreeParser is had to add:

public:
  virtual void program(ANTLR_USE_NAMESPACE(
antlr)RefAST _t)
  {
    program((RefMyAST)_t);
  }

Note the cast from RefAST to RefMyAST.  If I don't do this, I get a
compilation error.
        void antlr::TreeParser::program(antlr::RefAST)' : is abstract

Is what I did to get around this reasonable?  Or is there a better way.

After this, I also hit another problem requiring me to add the following to
MyAST.hpp:

   virtual void initialize( ANTLR_USE_NAMESPACE(antlr)RefAST ast )
   {
      initialize((RefMyAST) ast);
   }

Note the cast.  Anyone have similar problems?

Allan
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