| sequence/visitor/Sequence.cs - The class MaxVisitor. | Lecture 8 - slide 36 : 37 Program 7  | 
public class MaxVisitor: Visitor{
  public int Visit (IntInterval iv){
    return Math.Max(iv.From, iv.To);
  }
  public int Visit (IntSingular iv){
    return iv.TheInt;
  }
  public int Visit (IntCompSeq iv){
    return Math.Max(iv.First.Accept(this), 
                    iv.Second.Accept(this));
  }
}