| tag | 2d2d2f3ee9ca5726c4045894eb0a37b6cd429eee | |
|---|---|---|
| tagger | The Android Open Source Project <initial-contribution@android.com> | Tue Feb 04 14:08:28 2025 -0800 |
| object | 5ed69c0fd48a422b2b1842a0a2699df0758e2a38 |
Android 15.0.0 Release 17 (AP4A.250205.002.C1)
| commit | 5ed69c0fd48a422b2b1842a0a2699df0758e2a38 | [log] [tgz] |
|---|---|---|
| author | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Wed Aug 28 23:12:15 2024 +0000 |
| committer | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Wed Aug 28 23:12:15 2024 +0000 |
| tree | 38593a79432813e0f9bdc68d7b40d63591d311a2 | |
| parent | a1ead5f039d5b70a8432b631889e889f678e9fa0 [diff] | |
| parent | 01ddca84c99c71cc37912b0eb9ef42bd68f2a9c1 [diff] |
Snap for 12289667 from 01ddca84c99c71cc37912b0eb9ef42bd68f2a9c1 to 24Q4-release Change-Id: I33c407effb0e6b10689a02f784c9818d0640171e
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.