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

   1 //
   2 // Microsoft.Win32.SafeHandles.CriticalHandleMinusOneIsInvalid
   3 //
   4 // Author
   5 //       Zoltan Varga (vargaz@gmail.com)
   6 //       Miguel de Icaza (miguel@novell.com)
   7 //
   8 // Copyright (C) 2005, 2006 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.Runtime.InteropServices;
  32 using System.Runtime.ConstrainedExecution;
  33
  34 namespace Microsoft.Win32.SafeHandles {
  35
  36         public abstract class CriticalHandleMinusOneIsInvalid : CriticalHandle, IDisposable {
  37                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
  38                 protected CriticalHandleMinusOneIsInvalid () : base ((IntPtr) (-1)) {
  39                 }
  40
  41                 public override bool IsInvalid {
  42                         get {
  43                                 return handle == (IntPtr)(-1);
  44                         }
  45                 }
  46         }
  47 }
  48