mcs/tests/gtest-618.cs

   1 using System;
   2
   3 struct S1
   4 {
   5         public static implicit operator int (S1? s)
   6         {
   7                 return 1;
   8         }
   9 }
  10
  11 struct S2
  12 {
  13         public static implicit operator int? (S2? s)
  14         {
  15                 return null;
  16         }
  17 }
  18
  19 struct S3
  20 {
  21         public static implicit operator int? (S3? s)
  22         {
  23                 return 2;
  24         }
  25 }
  26
  27 struct S4
  28 {
  29         public static implicit operator int? (S4 s)
  30         {
  31                 return 3;
  32         }
  33 }
  34
  35 class C
  36 {
  37         public static int Main ()
  38         {
  39                 S1? s1 = new S1 ();
  40                 switch (s1) {
  41                 case 1:
  42                         break;
  43                 default:
  44                         return 1;
  45                 }
  46
  47                 S2? s2 = new S2 ();
  48                 switch (s2) {
  49                 case null:
  50                         break;
  51                 default:
  52                         return 2;
  53                 }
  54
  55                 S3? s3 = new S3 ();
  56                 switch (s3) {
  57                 case 2:
  58                         break;
  59                 default:
  60                         return 3;
  61                 }
  62
  63                 S4 s4 = new S4 ();
  64                 switch (s4) {
  65                 case 3:
  66                         break;
  67                 default:
  68                         return 4;
  69                 }
  70
  71                 return 0;
  72         }
  73 }