Homework 4

src/cd/ir/AstVisitor.java

@@ -16,6 +16,17 @@ public class AstVisitor<R,A> extends ExprVisitor<R,A> {
 		return ast.accept(this, arg);
 	}
 	
+	/**
+	 * Overrides {@link ExprVisitor#visitChildren(Expr, Object)} and
+	 * delegates to the more general {@link #visitChildren(Ast, Object)}
+	 * with {@link Ast} parameter. This method is final to prevent
+	 * overriding only one of the two versions.
+	 */
+	@Override
+	public final R visitChildren(Expr ast, A arg) {
+		return visitChildren((Ast) ast, arg);
+	}
+	
 	/**
 	 * A handy function which visits the children of {@code ast},
 	 * providing "arg" to each of them.  It returns the result of
@@ -45,6 +56,7 @@ public class AstVisitor<R,A> extends ExprVisitor<R,A> {
 	
 	/** 
 	 * The default action for expressions is to call this */
+	@Override
 	protected R dfltExpr(Expr ast, A arg) {
 		return dflt(ast, arg);
 	}