Stuff

class Top{};class Middle : public Top{};template< typename T >class Tpl : public Top{};class Visitor{  ~Visitor() {}  virtual void visit( const Top& v );  virtual void visit( const Middle& v );  /* won't compile, so you cannot visit this class directly. sucks, eh?  template< typename T >  virtual void visit( const Tpl< T >& v );  */};intmain(){  return 0;}