public void ValuePredicateDispatch()
{
Func <int, int> f = new MultiMethod <int, int>()
.Extend(Zero, Id)
.Extend(Even, Inc)
.Extend(Odd, Dec)
.Apply;
Assert.AreEqual(0, f(0));
Assert.AreEqual(4, f(5));
Assert.AreEqual(11, f(10));
}
static void Main(string[] args)
{
MultiMethod dlg;
dlg = new MultiMethod( FirstDelegate);
dlg();
dlg += new MultiMethod(SecondDelegate);
Console.WriteLine();
dlg();
dlg -= new MultiMethod(FirstDelegate);
Console.WriteLine();
dlg();
}
public void MultiParameterDispatch()
{
Func <int, int, int> f = new MultiMethod <int, int, int>()
.Extend(Even, Even, Mul)
.Extend(Odd, Odd, Add)
.Apply;
Assert.AreEqual(0, f(0, 2));
Assert.AreEqual(72, f(12, 6));
Assert.AreEqual(32, f(4, 8));
Assert.AreEqual(12, f(3, 9));
Assert.AreEqual(12, f(5, 7));
Assert.Throws <NotImplementedException>(() => f(2, 5));
}
public void ClassHierarchyDispatch()
{
Func <Shape, string> f = new MultiMethod <Shape, string>()
.Extend((Tri _) => "tri")
.Extend((Square _) => "square") // Extension order is important
.Extend((Quad _) => "quad")
.ExtendExact((Round _) => "round")
.Apply;
Assert.AreEqual("tri", f(new Tri()));
Assert.AreEqual("quad", f(new Quad()));
Assert.AreEqual("square", f(new Square()));
Assert.Throws <NotImplementedException>(() => f(new Shape()));
Assert.AreEqual("round", f(new Round()));
Assert.Throws <NotImplementedException>(() => f(new Circle()));
}
