| commit | 11a7f45fd034e0a1a9a62a86008b869db1ac4e44 | [log] [tgz] |
|---|---|---|
| author | Ted Bauer <[email protected]> | Fri Apr 12 15:52:18 2024 +0000 |
| committer | Ted Bauer <[email protected]> | Fri Apr 12 15:52:18 2024 +0000 |
| tree | 4645491f2b662a678e34bf528b0c11458d39478f | |
| parent | c7c9c6a948346c7536018e3785109b34fd717c37 [diff] |
Set min_sdk_version to 29 This dependency is needed for aconfig flagging, which should be supported on all mainline modules. Bug: 328444881 Test: m Change-Id: Ic007afa22716b037c478763ec2680f759ae19ea6
A simple and fast random number generator.
The implementation uses Wyrand, a simple and fast generator but not cryptographically secure.
Flip a coin:
if fastrand::bool() { println!("heads"); } else { println!("tails"); }
Generate a random i32:
let num = fastrand::i32(..);
Choose a random element in an array:
let v = vec![1, 2, 3, 4, 5]; let i = fastrand::usize(..v.len()); let elem = v[i];
Shuffle an array:
let mut v = vec![1, 2, 3, 4, 5]; fastrand::shuffle(&mut v);
Generate a random Vec or String:
use std::iter::repeat_with; let v: Vec<i32> = repeat_with(|| fastrand::i32(..)).take(10).collect(); let s: String = repeat_with(fastrand::alphanumeric).take(10).collect();
To get reproducible results on every run, initialize the generator with a seed:
// Pick an arbitrary number as seed. fastrand::seed(7); // Now this prints the same number on every run: println!("{}", fastrand::u32(..));
To be more efficient, create a new Rng instance instead of using the thread-local generator:
use std::iter::repeat_with; let rng = fastrand::Rng::new(); let mut bytes: Vec<u8> = repeat_with(|| rng.u8(..)).take(10_000).collect();
Licensed under either of
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.