| commit | 4d77a6d5fe7f67ff6bdc1f0220f78f39df7938fb | [log] [tgz] |
|---|---|---|
| author | Xin Li <[email protected]> | Mon Apr 29 23:45:53 2024 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Mon Apr 29 23:45:53 2024 +0000 |
| tree | 4645491f2b662a678e34bf528b0c11458d39478f | |
| parent | af8a825b9842d7ed3d6efd00ec17575e624ac940 [diff] | |
| parent | 50fd2d04859d9e1a302b0062df67c4735f5af434 [diff] |
[automerger skipped] Empty merge of Android 24Q2 Release (ab/11526283) to aosp-main-future am: 50fd2d0485 -s ours am skip reason: Merged-In I27427dde12f6f6c533e7533d1e08e23db464b80b with SHA-1 3483f733f5 is already in history Original change: https://googleplex-android-review.googlesource.com/c/platform/external/rust/crates/fastrand/+/27145173 Change-Id: I7bf5808e3419db22c8871c4d6b526090e406b4aa Signed-off-by: Automerger Merge Worker <[email protected]>
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.