mcs/tests/gtest-544.cs

   1 using System;
   2
   3 public abstract class A<T>
   4 {
   5         public abstract G Foo<G> () where G : T;
   6
   7         public virtual G Foo2<G> () where G : T
   8         {
   9                 return default (G);
  10         }
  11 }
  12
  13 public class B : A<int?>
  14 {
  15         public override G Foo<G> ()
  16         {
  17                 return new G ();
  18         }
  19
  20         public override G Foo2<G> ()
  21         {
  22                 return base.Foo2<G> ();
  23         }
  24 }
  25
  26 abstract class A2<T>
  27 {
  28         public abstract void Foo<U> () where U : struct, T;
  29 }
  30
  31 class B2 : A2<System.ValueType>
  32 {
  33         public override void Foo<Y> ()
  34         {
  35         }
  36 }
  37
  38 abstract class A3<T>
  39 {
  40         public abstract void Foo<U> () where U : class, T;
  41 }
  42
  43 class B3 : A3<System.Object>
  44 {
  45         public override void Foo<Y> ()
  46         {
  47         }
  48 }
  49
  50 class Program
  51 {
  52         public static int Main ()
  53         {
  54                 var b = new B ();
  55                 if (b.Foo<int?> () == null)
  56                         return 0;
  57
  58                 b.Foo2<int?> ();
  59
  60                 var b2 = new B2 ();
  61                 b2.Foo<byte> ();
  62
  63                 var b3 = new B3 ();
  64                 b3.Foo<string> ();
  65
  66                 return 1;
  67         }
  68 }