mcs/tests/gtest-021.cs

   1 // Testing the default value expressions (14.5.13)
   2
   3 using System;
   4
   5 class Foo<T>
   6 {
   7         T[] t;
   8
   9         public Foo (int n)
  10         {
  11                 t = new T [n];
  12                 for (int i = 0; i < n; i++)
  13                         t [i] = default (T);
  14         }
  15
  16         public void Test ()
  17         {
  18                 X.Print (t [0]);
  19         }
  20 }
  21
  22 class Bar<T>
  23 {
  24         public void Test ()
  25         {
  26                 X.Print (default (X));
  27                 X.Print (default (T));
  28                 X.Print (default (S));
  29         }
  30 }
  31
  32 struct S
  33 {
  34         public readonly string Hello;
  35
  36         S (string hello)
  37         {
  38                 this.Hello = hello;
  39         }
  40
  41         public override string ToString ()
  42         {
  43                 return String.Format ("S({0})", Hello);
  44         }
  45
  46 }
  47
  48 class X
  49 {
  50         public static void Print (object obj)
  51         {
  52                 if (obj == null)
  53                         Console.WriteLine ("NULL");
  54                 else
  55                         Console.WriteLine ("OBJECT: {0} {1}", obj, obj.GetType ());
  56         }
  57
  58         public static void Main ()
  59         {
  60                 Foo<string> a = new Foo<string> (4);
  61                 a.Test ();
  62
  63                 Bar<int> b = new Bar<int> ();
  64                 b.Test ();
  65                 Bar<X> c = new Bar<X> ();
  66                 c.Test ();
  67         }
  68 }