tests/gtest-126.cs

   1 using System.Collections.Generic;
   2
   3 // comment this line to see another bug in gmcs (unrelated)
   4 interface IB { bool foo (); }
   5
   6
   7 class B : IB { public bool foo () { return true; } }
   8
   9 interface Filter <T> where T : IB {
  10   T Is (IB x);
  11
  12 }
  13
  14 struct K : IB {
  15   public bool foo () { return false; }
  16
  17 }
  18
  19 class MyFilter : Filter <K> {
  20   public K Is (IB x) { return new K(); }
  21 }
  22
  23 class MyBFilter : Filter <B> {
  24   public B Is (IB x) { return new B(); }
  25 }
  26
  27 class M {
  28
  29   static List<T> foo1 <T> (Filter <T> x) where T : IB {
  30     List <T> result = new List <T>();
  31     T maybe = x.Is (new B());
  32     if (maybe != null)
  33       result.Add (maybe);
  34     return result;
  35   }
  36
  37   static void Main () {
  38        MyFilter m = new MyFilter ();
  39         System.Console.WriteLine (foo1 <K> (m).Count);
  40         MyBFilter mb = new MyBFilter ();
  41         System.Console.WriteLine (foo1 <B> (mb).Count);
  42   }
  43 }