mcs/tests/gtest-variance-1.cs

   1 interface IFoo<out T>
   2 {
   3         T Bar { get; }
   4 }
   5
   6 class Foo : IFoo<string>
   7 {
   8         readonly string bar;
   9         public Foo (string bar)
  10         {
  11                 this.bar = bar;
  12         }
  13         public string Bar { get { return bar; } }
  14 }
  15
  16 public class Test
  17 {
  18         public static int Main ()
  19         {
  20                 string bar = "Who is John Galt?";
  21                 IFoo<string> foo = new Foo(bar);
  22                 IFoo<object> foo2 = foo;
  23                 if (!foo2.Bar.Equals (bar))
  24                         return 1;
  25
  26                 foo2 = new Foo(bar);
  27                 if (foo2.Bar != bar)
  28                         return 2;
  29
  30                 return 0;
  31         }
  32 }