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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Runtime.CompilerServices;
using System.Runtime.Versioning;
namespace System
{
// The Object is the root class for all object in the CLR System. Object
// is the super class for all other CLR objects and provide a set of methods and low level
// services to subclasses. These services include object synchronization and support for clone
// operations.
//
[Serializable]
[TypeForwardedFrom("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public partial class Object
{
// Creates a new instance of an Object.
[NonVersionable]
public Object()
{
}
// Allow an object to free resources before the object is reclaimed by the GC.
// This method's virtual slot number is hardcoded in runtimes. Do not add any virtual methods ahead of this.
[NonVersionable]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1821:RemoveEmptyFinalizers")]
~Object()
{
}
// Returns a String which represents the object instance. The default
// for an object is to return the fully qualified name of the class.
public virtual string ToString()
{
return GetType().ToString();
}
// Returns a boolean indicating if the passed in object obj is
// Equal to this. Equality is defined as object equality for reference
// types and bitwise equality for value types using a loader trick to
// replace Equals with EqualsValue for value types).
public virtual bool Equals(object obj)
{
return RuntimeHelpers.Equals(this, obj);
}
public static bool Equals(object objA, object objB)
{
if (objA == objB)
{
return true;
}
if (objA == null || objB == null)
{
return false;
}
return objA.Equals(objB);
}
[NonVersionable]
public static bool ReferenceEquals(object objA, object objB)
{
return objA == objB;
}
// GetHashCode is intended to serve as a hash function for this object.
// Based on the contents of the object, the hash function will return a suitable
// value with a relatively random distribution over the various inputs.
//
// The default implementation returns the sync block index for this instance.
// Calling it on the same object multiple times will return the same value, so
// it will technically meet the needs of a hash function, but it's less than ideal.
// Objects (& especially value classes) should override this method.
public virtual int GetHashCode()
{
return RuntimeHelpers.GetHashCode(this);
}
}
}
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