--- branches/development/src/antlr/BaseAST.hpp	2010/07/09 23:08:25	1465
+++ branches/development/src/antlr/BaseAST.hpp	2011/09/15 13:39:36	1633
@@ -8,11 +8,11 @@
  * $Id$
  */
 
-#include <iostream>
-
 #include <antlr/config.hpp>
 #include <antlr/AST.hpp>
 
+#include <iostream>
+
 #ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
 namespace antlr {
 #endif
@@ -34,17 +34,10 @@ class ANTLR_API BaseAST : public AST { (public)
 	}
 
 	/// Return the class name
-	const char* typeName( void ) const
-	{
-		return BaseAST::TYPE_NAME;
-	}
+	virtual const char* typeName( void ) const = 0;
 
 	/// Clone this AST node.
-	RefAST clone( void ) const
-	{
-		ANTLR_USE_NAMESPACE(std)cerr << "BaseAST::clone()" << ANTLR_USE_NAMESPACE(std)endl;
-		return nullAST;
-	}
+	virtual RefAST clone( void ) const = 0;
 
    /// Is node t equal to this in terms of token type and text?
 	virtual bool equals(RefAST t) const;
@@ -138,7 +131,7 @@ class ANTLR_API BaseAST : public AST { (public)
 	}
 
 	/// Set the next sibling after this one.
-	void setNextSibling(RefAST n)
+	virtual void setNextSibling(RefAST n)
 	{
 		right = static_cast<BaseAST*>(static_cast<AST*>(n));
 	}
@@ -175,8 +168,6 @@ class ANTLR_API BaseAST : public AST { (public)
 	/// Print out a child sibling tree in LISP notation
 	virtual ANTLR_USE_NAMESPACE(std)string toStringList() const;
 	virtual ANTLR_USE_NAMESPACE(std)string toStringTree() const;
-
-	static const char* const TYPE_NAME;
 protected:
 	RefBaseAST down;
 	RefBaseAST right;