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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 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 | 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 library util; | 5 #library('util'); |
| 6 | 6 |
| 7 /** | 7 /** |
| 8 * An abstract map implementation. This class can be used as a superclass for | 8 * An abstract map implementation. This class can be used as a superclass for |
| 9 * implementing maps, requiring only the further implementation of the | 9 * implementing maps, requiring only the further implementation of the |
| 10 * [:operator []:], [:forEach:] and [:length:] methods to provide a fully | 10 * [:operator []:], [:forEach:] and [:length:] methods to provide a fully |
| 11 * implemented immutable map. | 11 * implemented immutable map. |
| 12 */ | 12 */ |
| 13 abstract class AbstractMap<K,V> implements Map<K,V> { | 13 abstract class AbstractMap<K,V> implements Map<K,V> { |
| 14 AbstractMap(); | 14 AbstractMap(); |
| 15 | 15 |
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| 164 | 164 |
| 165 void forEach(void f(K key, Vout value)) { | 165 void forEach(void f(K key, Vout value)) { |
| 166 _map.forEach((K k, Vin v) { | 166 _map.forEach((K k, Vin v) { |
| 167 var value = _filter(v); | 167 var value = _filter(v); |
| 168 if (value != null) { | 168 if (value != null) { |
| 169 f(k, value); | 169 f(k, value); |
| 170 } | 170 } |
| 171 }); | 171 }); |
| 172 } | 172 } |
| 173 } | 173 } |
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