| // Copyright (c) 2012, 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. |
| |
| part of dart.math; |
| |
| /** |
| * A generator of random bool, int, or double values. |
| * |
| * The default implementation supplies a stream of |
| * pseudo-random bits that are not suitable for cryptographic purposes. |
| */ |
| abstract class Random { |
| /** |
| * Creates a random-number generator. The optional parameter [seed] is used |
| * to initialize the internal state of the generator. The implementation of |
| * the random stream can change between releases of the library. |
| * |
| * Implementation note: The default implementation uses up to 64-bits of seed. |
| */ |
| external factory Random([int seed]); |
| |
| /** |
| * Generates a positive random integer uniformly distributed on the range |
| * from 0, inclusive, to [max], exclusive. |
| * |
| * Implementation note: The default implementation supports [max] values |
| * between 1 and ((1<<32) - 1) inclusive. |
| */ |
| int nextInt(int max); |
| |
| /** |
| * Generates a positive random floating point value uniformly distributed on |
| * the range from 0.0, inclusive, to 1.0, exclusive. |
| */ |
| double nextDouble(); |
| |
| /** |
| * Generates a random boolean value. |
| */ |
| bool nextBool(); |
| } |