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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 part of dart.core; | 
|  | 6 | 
| 5 /** | 7 /** | 
| 6  * A simple [Stopwatch] interface to measure elapsed time. | 8  * A simple [Stopwatch] interface to measure elapsed time. | 
| 7  */ | 9  */ | 
| 8 abstract class Stopwatch { | 10 abstract class Stopwatch { | 
| 9   /** | 11   /** | 
| 10    * Creates a [Stopwatch] in stopped state with a zero elapsed count. | 12    * Creates a [Stopwatch] in stopped state with a zero elapsed count. | 
| 11    * | 13    * | 
| 12    * The following example shows how to start a [Stopwatch] | 14    * The following example shows how to start a [Stopwatch] | 
| 13    * right after allocation. | 15    * right after allocation. | 
| 14    * | 16    * | 
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| 121 | 123 | 
| 122   int get elapsedMilliseconds { | 124   int get elapsedMilliseconds { | 
| 123     return (elapsedTicks * 1000) ~/ frequency; | 125     return (elapsedTicks * 1000) ~/ frequency; | 
| 124   } | 126   } | 
| 125 | 127 | 
| 126   int get frequency => _frequency(); | 128   int get frequency => _frequency(); | 
| 127 | 129 | 
| 128   external static int _frequency(); | 130   external static int _frequency(); | 
| 129   external static int _now(); | 131   external static int _now(); | 
| 130 } | 132 } | 
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