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| 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 |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 import "dart:collection"; |
| 6 import "package:expect/expect.dart"; |
| 7 |
| 8 class A extends IterableBase { |
| 9 int count; |
| 10 A(this.count); |
| 11 |
| 12 Iterator get iterator { |
| 13 return new AIterator(count); |
| 14 } |
| 15 } |
| 16 |
| 17 class AIterator implements Iterator { |
| 18 int _count; |
| 19 int _current; |
| 20 |
| 21 AIterator(this._count); |
| 22 |
| 23 bool moveNext() { |
| 24 if (_count > 0) { |
| 25 _current = _count; |
| 26 _count--; |
| 27 return true; |
| 28 } |
| 29 _current = null; |
| 30 return false; |
| 31 } |
| 32 |
| 33 get current => _current; |
| 34 } |
| 35 |
| 36 main() { |
| 37 var a = new A(10); |
| 38 Expect.equals(10, a.length); |
| 39 a = new A(0); |
| 40 Expect.equals(0, a.length); |
| 41 a = new A(5); |
| 42 Expect.equals(5, a.map((e) => e + 1).length); |
| 43 Expect.equals(3, a.where((e) => e >= 3).length); |
| 44 } |
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