Move TrySet method from TaskCompletionSource to Task, so AsyncTaskMethodBuilder can...
[mono.git] / mcs / class / corlib / System.Runtime.CompilerServices / AsyncTaskMethodBuilder_T.cs
1 //
2 // AsyncTaskMethodBuilder_T.cs
3 //
4 // Authors:
5 //      Marek Safar  <marek.safar@gmail.com>
6 //
7 // Copyright (C) 2011 Novell, Inc (http://www.novell.com)
8 // Copyright (C) 2011 Xamarin, Inc (http://www.xamarin.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 #if NET_4_5
31
32 using System.Threading;
33 using System.Threading.Tasks;
34
35 namespace System.Runtime.CompilerServices
36 {
37         public struct AsyncTaskMethodBuilder<TResult>
38         {
39                 readonly Task<TResult> task;
40
41                 private AsyncTaskMethodBuilder (Task<TResult> task)
42                 {
43                         this.task = task;
44                 }
45
46                 public Task<TResult> Task {
47                         get {
48                                 return task;
49                         }
50                 }
51                 
52                 public static AsyncTaskMethodBuilder<TResult> Create ()
53                 {
54                         var task = new Task<TResult> (TaskActionInvoker.Empty, null, CancellationToken.None, TaskCreationOptions.None, null);
55                         task.SetupScheduler (TaskScheduler.Current);
56                         return new AsyncTaskMethodBuilder<TResult> (task);
57                 }
58
59                 public void SetException (Exception exception)
60                 {
61                         if (!task.TrySetException (new AggregateException (exception)))
62                                 throw new InvalidOperationException ("The task has already completed");
63                 }
64
65                 public void SetResult (TResult result)
66                 {
67                         if (!task.TrySetResult (result))
68                                 throw new InvalidOperationException ("The task has already completed");
69                 }
70         }
71 }
72
73 #endif