mcs/tests/test-301.cs

   1 // Compiler options: -unsafe
   2
   3 using System;
   4 using System.Runtime.InteropServices;
   5
   6 class A
   7 {
   8         [StructLayout (LayoutKind.Sequential)]
   9         struct S { int x; }
  10
  11         public class B
  12         {
  13                 [StructLayout (LayoutKind.Sequential)]
  14                 struct S { int x; int y; }
  15                 S s;
  16
  17                 public B () {
  18                         string error = "";
  19
  20                         unsafe {
  21                                 if (typeof (S *).GetElementType () != typeof (A.B.S))
  22                                         error += " composed cast (pointer),";
  23
  24                                 if (sizeof (S) != sizeof (A.B.S))
  25                                         error += " sizeof,";
  26
  27                                 S *p1 = stackalloc S [1];
  28
  29                                 if ((*p1).GetType () != typeof (A.B.S))
  30                                         error += " local declaration, 'stackalloc' keyword,";
  31
  32                                 fixed (S *p2 = &s) {
  33                                         if ((*p2).GetType () != typeof (A.B.S))
  34                                                 error += " class declaration, 'fixed' statement,";
  35                                 }
  36                         }
  37
  38                         if (error.Length != 0)
  39                                 throw new Exception ("The following couldn't resolve S as A+B+S:" + error);
  40                 }
  41         }
  42
  43         public static void Main()
  44         {
  45                 object o = new A.B();
  46         }
  47 }