static void Main(string[] args)
{
Cat c = new Cat();
Dog d = new Dog();
Shiba s = new Shiba();
Mutant m = new Mutant();
var visitor = new MakeSoundVisitor();
// Classic visitor pattern allows us to add behavior to existing objects without modifying them
Console.WriteLine("Call Accept() using classic visitor");
c.Accept(visitor);
d.Accept(visitor);
s.Accept(visitor);
m.Accept(visitor);
// Think of the Accept() method as a way to delegate the desired action to whichever Visitor implementation is passed in
// Virtual functions are dispatched dynamically while function overloading is done statically.
// To get around this, double dispatch is used
Console.WriteLine("Testing wrapper");
var wrappedCat = new AnimalWrapper(c);
wrappedCat.Accept(visitor);
var dynamicVisitor = new MakeSoundDynamicVisitor();
Console.WriteLine("Call Accept() using dynamic visitor");
c.Accept(dynamicVisitor);
d.Accept(dynamicVisitor);
s.Accept(dynamicVisitor);
m.Accept(dynamicVisitor);
Console.WriteLine("Direct call to dynamic visitor");
dynamicVisitor.Visit(c);
dynamicVisitor.Visit(d);
dynamicVisitor.Visit(s);
dynamicVisitor.Visit(m);
Console.ReadKey();
}