| // 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 factory StreamTransformer(StreamSubscription<T> |
| /// transformer(Stream<S> stream, bool cancelOnError)) |
| /// Creates a StreamTransformer. |
| /// |
| /// The returned instance takes responsibility of implementing (bind). When |
| /// the user invokes bind it returns a new "bound" stream. Only when the user |
| /// starts listening to the bound stream, the listen method invokes the given |
| /// closure transformer. |
| /// |
| /// @description Checks that returned instance implements bind. |
| /// @author ilya |
| |
| import "dart:async"; |
| |
| main() { |
| StreamTransformer tr = new StreamTransformer((stream, cancelOnError) { |
| return stream.listen((var x) {}); |
| }); |
| tr.bind; |
| } |