mcs/tests/gtest-iter-16.cs

   1 using System.Collections.Generic;
   2
   3 namespace Test
   4 {
   5         public abstract class Base
   6         {
   7                 public virtual IEnumerable<Base> GetStuff (int a)
   8                 {
   9                         yield return this;
  10                 }
  11         }
  12
  13         public abstract class Derived : Base
  14         {
  15                 public override IEnumerable<Base> GetStuff (int a)
  16                 {
  17                         foreach (var x in base.GetStuff (a))
  18                                 yield return x;
  19                 }
  20         }
  21
  22         public class SpecialDerived : Derived
  23         {
  24                 public override IEnumerable<Base> GetStuff (int a)
  25                 {
  26                         foreach (var x in base.GetStuff (a))
  27                                 yield return x;
  28                 }
  29
  30                 public static void Main ()
  31                 {
  32                         Base b = new SpecialDerived ();
  33                         foreach (var a in b.GetStuff (5)) {
  34                         }
  35                 }
  36         }
  37 }