mcs/tests/gtest-variance-2.cs

   1 // Compiler options: -langversion:future
   2
   3 interface IFoo<in T>
   4 {
   5         string Bar (T t);
   6 }
   7
   8 class Foo : IFoo<object>
   9 {
  10         public string Bar (object t)
  11         {
  12                 return t.GetType ().FullName;
  13         }
  14 }
  15
  16 public class Test
  17 {
  18         static int Main ()
  19         {
  20                 IFoo<object> foo = new Foo ();
  21                 IFoo<string> foo2 = foo;
  22
  23                 if (foo2.Bar ("blah") != typeof (string).FullName)
  24                         return 1;
  25
  26                 foo2 = new Foo();
  27                 if (foo2.Bar ("blah") != typeof (string).FullName)
  28                         return 2;
  29
  30
  31                 return 0;
  32         }
  33 }