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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, 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; | 5 part of dart.collection; |
6 | 6 |
7 /** Common parts of [HashSet] and [LinkedHashSet] implementations. */ | 7 /** Common parts of [HashSet] and [LinkedHashSet] implementations. */ |
8 abstract class _HashSetBase<E> extends SetBase<E> { | 8 abstract class _HashSetBase<E> extends SetBase<E> { |
9 | 9 |
10 // The following two methods override the ones in SetBase. | 10 // The following two methods override the ones in SetBase. |
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114 * All the [elements] should be assignable to [E]. | 114 * All the [elements] should be assignable to [E]. |
115 * The `elements` iterable itself may have any element type, so this | 115 * The `elements` iterable itself may have any element type, so this |
116 * constructor can be used to down-cast a `Set`, for example as: | 116 * constructor can be used to down-cast a `Set`, for example as: |
117 * | 117 * |
118 * Set<SuperType> superSet = ...; | 118 * Set<SuperType> superSet = ...; |
119 * Set<SubType> subSet = | 119 * Set<SubType> subSet = |
120 * new HashSet<SubType>.from(superSet.where((e) => e is SubType)); | 120 * new HashSet<SubType>.from(superSet.where((e) => e is SubType)); |
121 */ | 121 */ |
122 factory HashSet.from(Iterable elements) { | 122 factory HashSet.from(Iterable elements) { |
123 HashSet<E> result = new HashSet<E>(); | 123 HashSet<E> result = new HashSet<E>(); |
124 for (E e in elements) result.add(e); | 124 for (final e in elements) { |
| 125 E element = e as Object/*=E*/; |
| 126 result.add(element); |
| 127 } |
125 return result; | 128 return result; |
126 } | 129 } |
127 | 130 |
128 /** | 131 /** |
129 * Provides an iterator that iterates over the elements of this set. | 132 * Provides an iterator that iterates over the elements of this set. |
130 * | 133 * |
131 * The order of iteration is unspecified, | 134 * The order of iteration is unspecified, |
132 * but consistent between changes to the set. | 135 * but consistent between changes to the set. |
133 */ | 136 */ |
134 Iterator<E> get iterator; | 137 Iterator<E> get iterator; |
135 } | 138 } |
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