| // Copyright (c) 2016, 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. | |
| /// A generator of globally unique identifiers. | |
| class IdGenerator { | |
| int _nextFreeId = 0; | |
| /// Returns the next free identifier. | |
| /// | |
| /// This identifier is guaranteed to be unique. | |
| int getNextFreeId() => _nextFreeId++; | |
| } |