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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.
//
// Abstract derivations of SafeHandle designed to provide the common
// functionality supporting Win32 handles. More specifically, they describe how
// an invalid handle looks (for instance, some handles use -1 as an invalid
// handle value, others use 0).
//
// Further derivations of these classes can specialise this even further (e.g.
// file or registry handles).
//
//
using System;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using System.Runtime.ConstrainedExecution;
namespace Microsoft.Win32.SafeHandles
{
// Class of safe handle which uses 0 or -1 as an invalid handle.
public abstract class SafeHandleZeroOrMinusOneIsInvalid : SafeHandle
{
protected SafeHandleZeroOrMinusOneIsInvalid(bool ownsHandle) : base(IntPtr.Zero, ownsHandle)
{
}
// A default constructor is needed to satisfy CoreCLR inheritence rules. It should not be called at runtime
protected SafeHandleZeroOrMinusOneIsInvalid()
{
throw new NotImplementedException();
}
public override bool IsInvalid
{
get { return handle.IsNull() || handle == new IntPtr(-1); }
}
}
// Class of safe handle which uses only -1 as an invalid handle.
public abstract class SafeHandleMinusOneIsInvalid : SafeHandle
{
protected SafeHandleMinusOneIsInvalid(bool ownsHandle) : base(new IntPtr(-1), ownsHandle)
{
}
// A default constructor is needed to satisfy CoreCLR inheritence rules. It should not be called at runtime
protected SafeHandleMinusOneIsInvalid()
{
throw new NotImplementedException();
}
public override bool IsInvalid
{
get { return handle == new IntPtr(-1); }
}
}
}
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