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// 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.
class SetRelation {
/// The second set contains all elements of the first, as well as possibly
/// more.
static const subset = SetRelation._('subset');
/// Neither set contains any elements of the other.
static const disjoint = SetRelation._('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.
static const overlapping = SetRelation._('overlapping');
final String _name;
const SetRelation._(this._name);
String toString() => _name;