| tag | 120107bbc269b6b426c35c7d8519c6f06ae7f235 | |
|---|---|---|
| tagger | The Android Open Source Project <initial-contribution@android.com> | Mon Feb 03 09:03:54 2025 -0800 |
| object | 964cb58933e235c7919e318d72f7fb1235379256 |
Android Security 14.0.0 Release 17 (12787469)
| commit | 964cb58933e235c7919e318d72f7fb1235379256 | [log] [tgz] |
|---|---|---|
| author | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Fri Mar 10 02:19:57 2023 +0000 |
| committer | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Fri Mar 10 02:19:57 2023 +0000 |
| tree | db504e270310dcd06e1372842ea617bccc9a5852 | |
| parent | 02228911857253944929fea3cd567754477b7f38 [diff] | |
| parent | f858fea5a2f6d8b657ae78a7740a43c3b8632ead [diff] |
Snap for 9719949 from f858fea5a2f6d8b657ae78a7740a43c3b8632ead to udc-release Change-Id: I2688882767e88a12b692cb70c5fbf8af8c710253
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.