mcs/tests/gtest-274.cs

   1 using System;
   2
   3 public struct Foo
   4 {
   5         public readonly long Value;
   6
   7         public Foo (long value)
   8         {
   9                 this.Value = value;
  10         }
  11
  12         public static implicit operator Foo (long value)
  13         {
  14                 return new Foo (value);
  15         }
  16 }
  17
  18 public struct Bar
  19 {
  20         public readonly Foo Foo;
  21
  22         public Bar (Foo foo)
  23         {
  24                 this.Foo = foo;
  25         }
  26
  27         public static implicit operator Bar (Foo foo)
  28         {
  29                 return new Bar (foo);
  30         }
  31 }
  32
  33 public struct Baz
  34 {
  35         public readonly Foo Foo;
  36
  37         public Baz (Foo foo)
  38         {
  39                 this.Foo = foo;
  40         }
  41
  42         public static explicit operator Baz (Foo foo)
  43         {
  44                 return new Baz (foo);
  45         }
  46 }
  47
  48 struct S
  49 {
  50         public static implicit operator bool?(S arg)
  51         {
  52                 throw new ApplicationException ("should not be called");
  53         }
  54 }
  55
  56 class X
  57 {
  58         public static int Main ()
  59         {
  60                 int a = 3;
  61                 int? b = a;
  62                 int? b0 = null;
  63
  64                 Foo? f1 = a;
  65                 Foo? f2 = b;
  66                 Foo? f3 = b0;
  67                 Foo f4 = (Foo) b;
  68
  69                 Bar? b1 = f1;
  70                 Bar? b2 = f2;
  71                 Bar? b3 = f3;
  72                 Bar b4 = (Bar) f2;
  73
  74                 Baz? z1 = (Baz?) f1;
  75                 Baz? z2 = (Baz?) f2;
  76                 Baz? z3 = (Baz?) f3;
  77                 Baz z4 = (Baz) f2;
  78
  79                 S? s = null;
  80                 bool? g = s;
  81                 if (g != null)
  82                         return 1;
  83
  84                 return 0;
  85         }
  86 }