tests/gtest-variance-1.cs

   1 // Compiler options: -langversion:future
   2
   3 interface IFoo<out T>
   4 {
   5         T Bar { get; }
   6 }
   7
   8 class Foo : IFoo<string>
   9 {
  10         readonly string bar;
  11         public Foo (string bar)
  12         {
  13                 this.bar = bar;
  14         }
  15         public string Bar { get { return bar; } }
  16 }
  17
  18 public class Test
  19 {
  20         static int Main ()
  21         {
  22                 string bar = "Who is John Galt?";
  23                 IFoo<string> foo = new Foo(bar);
  24                 IFoo<object> foo2 = foo;
  25                 if (!foo2.Bar.Equals (bar))
  26                         return 1;
  27
  28                 foo2 = new Foo(bar);
  29                 if (foo2.Bar != bar)
  30                         return 2;
  31
  32                 return 0;
  33         }
  34 }