code.grnet.gr Git - pithos-ms-client/blob - trunk/Libraries/ParallelExtensionsExtras/Extensions/CompletedTask.cs

   1 //--------------------------------------------------------------------------
   2 //
   3 //  Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 //  File: CompletedTask.cs
   6 //
   7 //--------------------------------------------------------------------------
   8
   9 namespace System.Threading.Tasks
  10 {
  11     /// <summary>Provides access to an already completed task.</summary>
  12     /// <remarks>A completed task can be useful for using ContinueWith overloads where there aren't StartNew equivalents.</remarks>
  13     public static class CompletedTask
  14     {
  15         /// <summary>Gets a completed Task.</summary>
  16         public readonly static Task Default = CompletedTask<object>.Default;
  17     }
  18
  19     /// <summary>Provides access to an already completed task.</summary>
  20     /// <remarks>A completed task can be useful for using ContinueWith overloads where there aren't StartNew equivalents.</remarks>
  21     public static class CompletedTask<TResult>
  22     {
  23         /// <summary>Initializes a Task.</summary>
  24         static CompletedTask()
  25         {
  26             var tcs = new TaskCompletionSource<TResult>();
  27             tcs.TrySetResult(default(TResult));
  28             Default = tcs.Task;
  29         }
  30
  31         /// <summary>Gets a completed Task.</summary>
  32         public readonly static Task<TResult> Default;
  33     }
  34 }