class/corlib/System/TypedReference.cs

   1 //
   2 // System.TypedReference.cs
   3 //
   4 // Authors:
   5 //   Dick Porter (dick@ximian.com)
   6 //   Paolo Molaro (lupus@ximian.com)
   7 //
   8 // (C) Ximian, Inc.  http://www.ximian.com
   9 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Reflection;
  32 using System.Runtime.CompilerServices;
  33 using System.Security.Permissions;
  34 using System.Runtime.InteropServices;
  35
  36 namespace System
  37 {
  38         [CLSCompliant (false)]
  39         [ComVisible (true)]
  40         public struct TypedReference
  41         {
  42 #pragma warning disable 169
  43                 RuntimeTypeHandle type;
  44                 IntPtr value;
  45                 IntPtr klass;
  46 #pragma warning restore 169
  47
  48                 public override bool Equals (object o)
  49                 {
  50                         throw new NotSupportedException (Locale.GetText ("This operation is not supported for this type."));
  51                 }
  52
  53                 public override int GetHashCode ()
  54                 {
  55                         if (type.Value == IntPtr.Zero)
  56                                 return 0;
  57                         return Type.GetTypeFromHandle (type).GetHashCode ();
  58                 }
  59
  60                 public static Type GetTargetType (TypedReference value)
  61                 {
  62                         return Type.GetTypeFromHandle (value.type);
  63                 }
  64
  65                 [MonoTODO]
  66                 [CLSCompliant (false)]
  67                 [ReflectionPermission (SecurityAction.LinkDemand, MemberAccess = true)]
  68                 public static TypedReference MakeTypedReference (object target, FieldInfo[] flds)
  69                 {
  70                         if (target == null) {
  71                                 throw new ArgumentNullException ("target");
  72                         }
  73                         if (flds == null) {
  74                                 throw new ArgumentNullException ("flds");
  75                         }
  76                         if (flds.Length == 0) {
  77                                 throw new ArgumentException (Locale.GetText ("flds has no elements"));
  78                         }
  79                         throw new NotImplementedException ();
  80                 }
  81
  82                 /* how can we set something in value if it's passed by value? */
  83                 [MonoTODO]
  84                 [CLSCompliant (false)]
  85                 public static void SetTypedReference (TypedReference target, object value)
  86                 {
  87                         if (value == null) {
  88                                 throw new ArgumentNullException ("value");
  89                         }
  90                         throw new NotImplementedException ();
  91                 }
  92
  93                 public static RuntimeTypeHandle TargetTypeToken (TypedReference value)
  94                 {
  95                         return value.type;
  96                 }
  97
  98                 [MethodImpl (MethodImplOptions.InternalCall)]
  99                 public extern static object ToObject (TypedReference value);
 100         }
 101 }