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