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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, 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 // Dart core library. | 5 // Dart core library. |
| 6 | 6 |
| 7 interface Hashable { | 7 abstract class Hashable { |
| 8 int hashCode(); | 8 factory Hashable._uninstantiable() { |
| 9 throw const UnsupportedOperationException( |
| 10 "abstract class Hashable cannot be instantiated"); |
| 11 } |
| 12 abstract int hashCode(); |
| 9 } | 13 } |
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