Imported Upstream version 2.0.0.11992upstream/2.0.0.11992

1 files changed, 19 insertions, 0 deletions

diff --git a/src/mscorlib/shared/Microsoft/Win32/SafeHandles/SafeHandleMinusOneIsInvalid.cs b/src/mscorlib/shared/Microsoft/Win32/SafeHandles/SafeHandleMinusOneIsInvalid.cs
new file mode 100644
index 0000000000..5415f2c35d
--- /dev/null
+++ b/src/mscorlib/shared/Microsoft/Win32/SafeHandles/SafeHandleMinusOneIsInvalid.cs
@@ -0,0 +1,19 @@
+// 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;
+using System.Runtime.InteropServices;
+
+namespace Microsoft.Win32.SafeHandles
+{
+    // 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)
+        {
+        }
+
+        public override bool IsInvalid => handle == new IntPtr(-1);
+    }
+}