| tag | ce94c82a6f8648788d5d45b944c7849962988e46 | |
|---|---|---|
| tagger | The Android Open Source Project <initial-contribution@android.com> | Fri Jan 31 14:41:09 2025 -0800 |
| object | f0e10242e2151ca89960d6c9fe532a5bf340c41a |
aml_hef_351314220 (12777567,com.google.android.go.healthfitness,com.google.android.healthfitness)
| commit | f0e10242e2151ca89960d6c9fe532a5bf340c41a | [log] [tgz] |
|---|---|---|
| author | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Sun Sep 01 07:16:37 2024 +0000 |
| committer | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Sun Sep 01 07:16:37 2024 +0000 |
| tree | 38593a79432813e0f9bdc68d7b40d63591d311a2 | |
| parent | ed348a38344cbe124f2554cc747dc37911a11fea [diff] | |
| parent | 01ddca84c99c71cc37912b0eb9ef42bd68f2a9c1 [diff] |
Snap for 12306212 from 01ddca84c99c71cc37912b0eb9ef42bd68f2a9c1 to mainline-healthfitness-release Change-Id: Id22ae6a368a61d747dc8c9cd956beebf6756b2dc
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.