mcs/tests/test-null-operator-04.cs

   1 using System;
   2
   3 interface IFoo<T>
   4 {
   5         T Call ();
   6 }
   7
   8 class C1
   9 {
  10         public void Foo<T> (IFoo<T> t) where T : class
  11         {
  12                 t?.Call ();
  13                 var x = t?.Call ();
  14         }
  15
  16         public void Foo2<T> (IFoo<T> t)
  17         {
  18                 t?.Call ();
  19         }
  20 }
  21
  22 class C2<T> where T : class
  23 {
  24         C2<T> i;
  25         T field;
  26
  27         public void Foo ()
  28         {
  29                 var x = i?.field;
  30         }
  31 }
  32
  33 class Program
  34 {
  35         static void Test<T>(Func<T> func) where T : struct
  36         {
  37                 var r = func?.Invoke ();
  38         }
  39
  40         static void Test2<T>(Func<T> func)
  41         {
  42                 func?.Invoke ();
  43         }
  44
  45         static void Main()
  46         {
  47                 new C1 ().Foo<Program> (null);
  48                 new C1 ().Foo2<Program> (null);
  49
  50                 new C2<string> ().Foo ();
  51
  52                 Test (() => 1);
  53                 Test (() => 2);
  54         }
  55 }