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| 1 // Copyright (c) 2016, 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 'group_set.dart'; |
| 6 import 'wrappers.dart'; |
| 7 |
| 8 /// A set of sets that provides [set], a view of the union of those sets. |
| 9 /// |
| 10 /// This is a convenience class for creating a [GroupSet] whose contents change |
| 11 /// over the lifetime of a class. For example: |
| 12 /// |
| 13 /// ```dart |
| 14 /// class Foo { |
| 15 /// Set<String> get contents => _contentsGroup.set; |
| 16 /// final _contentsGroup = new SetGroup<String>(); |
| 17 /// |
| 18 /// // ... |
| 19 /// } |
| 20 /// ``` |
| 21 class SetGroup<E> extends DelegatingSet<Set<E>> { |
| 22 /// The [GroupSet] that provides a view of the union of sets in [this]. |
| 23 GroupSet<E> get set => _set; |
| 24 GroupSet<E> _set; |
| 25 |
| 26 /// Creates a set of sets that provides a view of the union of those sets. |
| 27 /// |
| 28 /// If [disjoint] is `true`, this assumes that all component sets are |
| 29 /// disjoint—that is, that they contain no elements in common. This makes |
| 30 /// many operations including [length] more efficient. |
| 31 SetGroup({bool disjoint: false}) : super(new Set<Set<E>>()) { |
| 32 _set = new GroupSet<E>(this, disjoint: disjoint); |
| 33 } |
| 34 } |
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