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;
45 public abstract class ValueType
47 protected ValueType ()
51 [MethodImplAttribute (MethodImplOptions.InternalCall)]
52 internal extern static bool InternalEquals (object o1, object o2, out object[] fields);
54 // This is also used by RuntimeHelpers
55 internal static bool DefaultEquals (object o1, object o2)
62 bool res = InternalEquals (o1, o2, out fields);
66 for (int i = 0; i < fields.Length; i += 2) {
67 object meVal = fields [i];
68 object youVal = fields [i + 1];
76 if (!meVal.Equals (youVal))
84 // True if this instance and o represent the same type
85 // and have the same value.
87 public override bool Equals (object obj)
89 return DefaultEquals (this, obj);
92 [MethodImplAttribute (MethodImplOptions.InternalCall)]
93 internal extern static int InternalGetHashCode (object o, out object[] fields);
96 // Gets a hashcode for this value type using the
97 // bits in the structure
99 public override int GetHashCode ()
102 int result = InternalGetHashCode (this, out fields);
105 for (int i = 0; i < fields.Length; ++i)
106 if (fields [i] != null)
107 result ^= fields [i].GetHashCode ();
113 // Stringified representation of this ValueType.
114 // Must be overriden for better results, by default
115 // it just returns the Type name.
117 public override string ToString ()
119 return GetType ().FullName;