| // Copyright (c) 2017, 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. | |
| /// An enum of possible relationships between two sets. | |
| enum SetRelation { | |
| /// The second set contains all elements of the first, as well as possibly | |
| /// more. | |
| subset('subset'), | |
| /// Neither set contains any elements of the other. | |
| disjoint('disjoint'), | |
| /// The sets have elements in common, but the first is not a superset of the | |
| /// second. | |
| /// | |
| /// This is also used when the first set is a superset of the first, but in | |
| /// practice we don't need to distinguish that from overlapping sets. | |
| overlapping('overlapping'); | |
| final String _name; | |
| const SetRelation(this._name); | |
| @override | |
| String toString() => _name; | |
| } |