| // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion Future then(dynamic onValue(T value), {Function onError}) |
| /// Register callbacks to be called when this future completes. |
| /// When this future completes with a value, the onValue callback will be |
| /// called with that value. If this future is already completed, the callback |
| /// will not be called immediately, but will be scheduled in a later microtask. |
| /// . . . |
| /// Returns a new Future which is completed with the result of the call to |
| /// onValue (if this future completes with a value) or to onError (if this |
| /// future completes with an error). |
| /// @description Checks that if this future is already completed, then the |
| /// invocation of onValue is delayed until the next event-loop iteration. |
| /// @author kaigorodov |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(Future f) { |
| bool visited = false; |
| f.then((fValue) { |
| visited = true; |
| Expect.equals(1, fValue); |
| asyncEnd(); |
| }); |
| Expect.isFalse(visited); |
| } |
| |
| main() { |
| Completer completer = new Completer(); |
| Future f = completer.future; |
| asyncStart(); |
| completer.complete(1); |
| check(f); |
| |
| f = new Future.value(1); |
| asyncStart(); |
| check(f); |
| } |