5 // Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
7 // Copyright (c) 2010 Jérémie "Garuma" Laval
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:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
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.
32 using System.Threading.Tasks;
34 namespace System.Threading.Tasks
36 public static class TaskExtensions
38 const TaskContinuationOptions opt = TaskContinuationOptions.ExecuteSynchronously;
40 public static Task<TResult> Unwrap<TResult> (this Task<Task<TResult>> task)
43 throw new ArgumentNullException ("task");
45 TaskCompletionSource<TResult> src = new TaskCompletionSource<TResult> ();
47 task.ContinueWith (t1 => CopyCat (t1, src, () => t1.Result.ContinueWith (t2 => CopyCat (t2, src, () => src.SetResult (t2.Result)), opt)), opt);
52 public static Task Unwrap (this Task<Task> task)
55 throw new ArgumentNullException ("task");
57 TaskCompletionSource<object> src = new TaskCompletionSource<object> ();
59 task.ContinueWith (t1 => CopyCat (t1, src, () => t1.Result.ContinueWith (t2 => CopyCat (t2, src, () => src.SetResult (null)), opt)), opt);
64 static void CopyCat<TResult> (Task source,
65 TaskCompletionSource<TResult> dest,
68 if (source.IsCanceled)
70 else if (source.IsFaulted)
71 dest.SetException (source.Exception.InnerExceptions);