public virtual string VisitConcreteElementA(ConcreteElementA concreteElementA, bool test)
{
return($"{concreteElementA.GetType().Name} visited by {this.GetType().Name}");
}
public override void VisitConcreteElementA(
ConcreteElementA concreteElementA)
{
Console.WriteLine("{0} visited by {1}",
concreteElementA.GetType().Name, this.GetType().Name);
}
public abstract void VisitConcreteElementA(
ConcreteElementA concreteElementA);
