mcs/tests/gtest-variance-8.cs

   1 using System;
   2
   3 interface IIn<in T>
   4 {
   5 }
   6
   7 interface IOut<out T>
   8 {
   9 }
  10
  11 class A<T> : IIn<T>, IOut<T>
  12 {
  13 }
  14
  15 class C
  16 {
  17         public static int Main ()
  18         {
  19                 IIn<string> a_string = new A<string> ();
  20                 IIn<object> a_object = new A<object> ();
  21
  22                 if (!(a_string is IIn<string>))
  23                         return 1;
  24
  25                 if ((a_string is IIn<object>))
  26                         return 2;
  27
  28                 if (!(a_object is IIn<string>))
  29                         return 3;
  30
  31                 if (!(a_object is IIn<object>))
  32                         return 4;
  33
  34                 IOut<string> b_string = new A<string> ();
  35                 IOut<object> b_object = new A<object> ();
  36
  37                 if (!(b_string is IOut<string>))
  38                         return 10;
  39
  40                 if (!(b_string is IOut<object>))
  41                         return 11;
  42
  43                 if (b_object is IOut<string>)
  44                         return 12;
  45
  46                 if (!(b_object is IOut<object>))
  47                         return 13;
  48
  49                 Console.WriteLine ("OK");
  50                 return 0;
  51         }
  52 }