5 // Marek Safar <marek.safar@gmail.com>
7 // Copyright (C) 2011 Novell, Inc (http://www.novell.com)
8 // Copyright (C) 2011 Xamarin, Inc (http://www.xamarin.com)
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:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
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.
32 using System.Threading.Tasks;
34 namespace System.Runtime.CompilerServices
36 public struct TaskAwaiter<TResult>
38 readonly Task<TResult> task;
40 internal TaskAwaiter (Task<TResult> task)
45 public bool IsCompleted {
47 return task.IsCompleted;
51 public TResult GetResult ()
53 if (task.Status != TaskStatus.RanToCompletion)
54 throw TaskAwaiter.HandleUnexpectedTaskResult (task);
59 public void OnCompleted (Action continuation)
61 if (continuation == null)
62 throw new ArgumentNullException ("continuation");
64 TaskAwaiter.HandleOnCompleted (task, continuation, true);