//
// System.ValueType.cs
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) Ximian, Inc. http://www.ximian.com
// (C) 2003 Novell, Inc. http://www.novell.com
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Reflection;
using System.Runtime.CompilerServices;
namespace System
{
[Serializable]
public abstract class ValueType
{
protected ValueType ()
{
}
[MethodImplAttribute (MethodImplOptions.InternalCall)]
internal extern static bool InternalEquals (object o1, object o2, out object[] fields);
// This is also used by RuntimeHelpers
internal static bool DefaultEquals (object o1, object o2)
{
object[] fields;
if (o2 == null)
return false;
bool res = InternalEquals (o1, o2, out fields);
if (fields == null)
return res;
for (int i = 0; i < fields.Length; i += 2) {
object meVal = fields [i];
object youVal = fields [i + 1];
if (meVal == null) {
if (youVal == null)
continue;
return false;
}
if (!meVal.Equals (youVal))
return false;
}
return true;
}
//
// True if this instance and o represent the same type
// and have the same value.
//
public override bool Equals (object o) {
return DefaultEquals (this, o);
}
[MethodImplAttribute (MethodImplOptions.InternalCall)]
internal extern static int InternalGetHashCode (object o, out object[] fields);
//
// Gets a hashcode for this value type using the
// bits in the structure
//
public override int GetHashCode ()
{
object[] fields;
int result = InternalGetHashCode (this, out fields);
if (fields != null)
for (int i = 0; i < fields.Length; ++i)
if (fields [i] != null)
result ^= fields [i].GetHashCode ();
return result;
}
//
// Stringified representation of this ValueType.
// Must be overriden for better results, by default
// it just returns the Type name.
//
public override string ToString ()
{
return GetType ().FullName;
}
}
}