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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, 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 part of dart._collection.dev; | 5 part of dart._collection.dev; |
6 | 6 |
7 /** | 7 /** |
8 * An [Iterable] for classes that have efficient [length] and [elementAt]. | 8 * An [Iterable] for classes that have efficient [length] and [elementAt]. |
9 * | 9 * |
10 * All other methods are implemented in terms of [length] and [elementAt], | 10 * All other methods are implemented in terms of [length] and [elementAt], |
11 * including [iterator]. | 11 * including [iterator]. |
12 */ | 12 */ |
13 abstract class ListIterable<E> extends Iterable<E> { | 13 abstract class ListIterable<E> extends Iterable<E> { |
14 int get length; | 14 int get length; |
15 E elementAt(int i); | 15 E elementAt(int i); |
16 | 16 |
| 17 const ListIterable(); |
| 18 |
17 Iterator<E> get iterator => new ListIterator<E>(this); | 19 Iterator<E> get iterator => new ListIterator<E>(this); |
18 | 20 |
19 void forEach(void action(E element)) { | 21 void forEach(void action(E element)) { |
20 int length = this.length; | 22 int length = this.length; |
21 for (int i = 0; i < length; i++) { | 23 for (int i = 0; i < length; i++) { |
22 action(elementAt(i)); | 24 action(elementAt(i)); |
23 if (length != this.length) { | 25 if (length != this.length) { |
24 throw new ConcurrentModificationError(this); | 26 throw new ConcurrentModificationError(this); |
25 } | 27 } |
26 } | 28 } |
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683 class EmptyIterator<E> implements Iterator<E> { | 685 class EmptyIterator<E> implements Iterator<E> { |
684 const EmptyIterator(); | 686 const EmptyIterator(); |
685 bool moveNext() => false; | 687 bool moveNext() => false; |
686 E get current => null; | 688 E get current => null; |
687 } | 689 } |
688 | 690 |
689 /** An [Iterator] that can move in both directions. */ | 691 /** An [Iterator] that can move in both directions. */ |
690 abstract class BiDirectionalIterator<T> implements Iterator<T> { | 692 abstract class BiDirectionalIterator<T> implements Iterator<T> { |
691 bool movePrevious(); | 693 bool movePrevious(); |
692 } | 694 } |
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