class/corlib/Microsoft.Win32.SafeHandles/SafeHandleZeroOrMinusOneIsInvalid.cs

   1 //
   2 // Microsoft.Win32.SafeHandles.SafeHandleZeroOrMinusOneIsInvalid
   3 //
   4 // Author
   5 //       Zoltan Varga (vargaz@gmail.com)
   6 //
   7 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Runtime.InteropServices;
  31 using System.Runtime.ConstrainedExecution;
  32
  33 namespace Microsoft.Win32.SafeHandles {
  34
  35         public abstract class SafeHandleZeroOrMinusOneIsInvalid : SafeHandle, IDisposable {
  36                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
  37                 protected SafeHandleZeroOrMinusOneIsInvalid (bool ownsHandle) : base ((IntPtr) 0, ownsHandle) {
  38                 }
  39
  40                 public override bool IsInvalid {
  41                         get {
  42                                 return handle == (IntPtr)(-1) || handle == (IntPtr) 0;
  43                         }
  44                 }
  45         }
  46 }