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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 abstract class Link<T> extends Iterable<T> { | 5 import "dart:collection"; |
| 6 |
| 7 abstract class Link<T> extends IterableBase<T> { |
6 // does not match constructor for LinkFactory | 8 // does not match constructor for LinkFactory |
7 factory Link(T head, [Link<T> tail]) = LinkFactory<T>; /// static type warning | 9 factory Link(T head, [Link<T> tail]) = LinkFactory<T>; /// static type warning |
8 Link<T> prepend(T element); | 10 Link<T> prepend(T element); |
9 } | 11 } |
10 | 12 |
11 abstract class EmptyLink<T> extends Link<T> { | 13 abstract class EmptyLink<T> extends Link<T> { |
12 const factory EmptyLink() = LinkTail<T>; | 14 const factory EmptyLink() = LinkTail<T>; |
13 } | 15 } |
14 | 16 |
15 class LinkFactory<T> { | 17 class LinkFactory<T> { |
(...skipping 25 matching lines...) Expand all Loading... |
41 } | 43 } |
42 | 44 |
43 main() { | 45 main() { |
44 new Fisk(); | 46 new Fisk(); |
45 // instantiation of abstract class | 47 // instantiation of abstract class |
46 new EmptyLink<String>().prepend('hest'); /// static type warning | 48 new EmptyLink<String>().prepend('hest'); /// static type warning |
47 // instantiation of abstract class | 49 // instantiation of abstract class |
48 const EmptyLink<String>().prepend('fisk'); /// static type warning | 50 const EmptyLink<String>().prepend('fisk'); /// static type warning |
49 } | 51 } |
50 | 52 |
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