mcs/tests/gtest-variance-8.cs

   1 // Compiler options: -langversion:future
   2
   3 using System;
   4
   5 interface IIn<in T>
   6 {
   7 }
   8
   9 interface IOut<out T>
  10 {
  11 }
  12
  13 class A<T> : IIn<T>, IOut<T>
  14 {
  15 }
  16
  17 class C
  18 {
  19         public static int Main ()
  20         {
  21                 IIn<string> a_string = new A<string> ();
  22                 IIn<object> a_object = new A<object> ();
  23
  24                 if (!(a_string is IIn<string>))
  25                         return 1;
  26
  27                 if ((a_string is IIn<object>))
  28                         return 2;
  29
  30                 if (!(a_object is IIn<string>))
  31                         return 3;
  32
  33                 if (!(a_object is IIn<object>))
  34                         return 4;
  35
  36                 IOut<string> b_string = new A<string> ();
  37                 IOut<object> b_object = new A<object> ();
  38
  39                 if (!(b_string is IOut<string>))
  40                         return 10;
  41
  42                 if (!(b_string is IOut<object>))
  43                         return 11;
  44
  45                 if (b_object is IOut<string>)
  46                         return 12;
  47
  48                 if (!(b_object is IOut<object>))
  49                         return 13;
  50
  51                 Console.WriteLine ("OK");
  52                 return 0;
  53         }
  54 }