public static void Main9(string[] args)
{
Small small1 = new Small();
Small small2 = new Big();
Small small3 = new Bigger();
Big big1 = new Big();
Big big2 = new Bigger();
//Big Big3 = new Small(); // Not allowed
Bigger bigger1 = new Bigger();
//Bigger bigger2 = new Big(); // not allowed
//The reason is instance can accept big funcitionality if the need is still small
//but instances can not accept the small need if the need is big
//So in order to serve these kind of funtionality we use covariance in C#
//we will create delegate
CovarDel delegateOb = MethodBigger;
Small small4 = delegateOb(new Bigger());
CovarDel delegateOb1 = MethodSmall; //delegate expecting the Bigger right now but we ave proided the method small
delegateOb1(new Bigger());
}
public static Big MethodBig(Bigger biggerOb)
{
Console.WriteLine("MethodBig");
return(new Big());
}