netcore/System.Private.CoreLib/src/System/WeakReference.T.cs

   1 // Licensed to the .NET Foundation under one or more agreements.
   2 // The .NET Foundation licenses this file to you under the MIT license.
   3 // See the LICENSE file in the project root for more information.
   4
   5 using System.Runtime.InteropServices;
   6
   7 namespace System
   8 {
   9         partial class WeakReference<T>
  10         {
  11                 GCHandle handle;
  12                 bool trackResurrection;
  13
  14                 T Target {
  15                         get {
  16                                 GCHandle h = handle;
  17                                 return h.IsAllocated ? (T) h.Target : null;
  18                         }
  19                 }
  20
  21                 ~WeakReference ()
  22                 {
  23                         handle.Free ();
  24                 }
  25
  26                 void Create (T target, bool trackResurrection)
  27                 {
  28                         if (trackResurrection) {
  29                                 trackResurrection = true;
  30                                 handle = GCHandle.Alloc (target, GCHandleType.WeakTrackResurrection);
  31                         } else {
  32                                 handle = GCHandle.Alloc (target, GCHandleType.Weak);
  33                         }
  34                 }
  35
  36                 public void SetTarget (T target)
  37                 {
  38                         handle.Target = target;
  39                 }
  40
  41                 bool IsTrackResurrection () => trackResurrection;
  42         }
  43 }