5 // Miguel de Icaza (miguel@ximian.com)
6 // Gonzalo Paniagua Javier (gonzalo@ximian.com)
8 // (C) Ximian, Inc. http://www.ximian.com
9 // (C) 2003 Novell, Inc. http://www.novell.com
13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
15 // Permission is hereby granted, free of charge, to any person obtaining
16 // a copy of this software and associated documentation files (the
17 // "Software"), to deal in the Software without restriction, including
18 // without limitation the rights to use, copy, modify, merge, publish,
19 // distribute, sublicense, and/or sell copies of the Software, and to
20 // permit persons to whom the Software is furnished to do so, subject to
21 // the following conditions:
23 // The above copyright notice and this permission notice shall be
24 // included in all copies or substantial portions of the Software.
26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35 using System.Reflection;
36 using System.Runtime.CompilerServices;
37 using System.Runtime.InteropServices;
43 public abstract class ValueType
45 protected ValueType ()
49 [MethodImplAttribute (MethodImplOptions.InternalCall)]
50 private extern static bool InternalEquals (object o1, object o2, out object[] fields);
52 // This is also used by RuntimeHelpers
53 internal static bool DefaultEquals (object o1, object o2)
60 bool res = InternalEquals (o1, o2, out fields);
64 for (int i = 0; i < fields.Length; i += 2) {
65 object meVal = fields [i];
66 object youVal = fields [i + 1];
74 if (!meVal.Equals (youVal))
82 // True if this instance and o represent the same type
83 // and have the same value.
85 public override bool Equals (object obj)
87 return DefaultEquals (this, obj);
90 [MethodImplAttribute (MethodImplOptions.InternalCall)]
91 internal extern static int InternalGetHashCode (object o, out object[] fields);
94 // Gets a hashcode for this value type using the
95 // bits in the structure
97 public override int GetHashCode ()
100 int result = InternalGetHashCode (this, out fields);
103 for (int i = 0; i < fields.Length; ++i)
104 if (fields [i] != null)
105 result ^= fields [i].GetHashCode ();
111 // Stringified representation of this ValueType.
112 // Must be overriden for better results, by default
113 // it just returns the Type name.
115 public override string ToString ()
117 return GetType ().FullName;