| commit | 33584a0a209a30b263c6205fb763df1b925b6886 | [log] [tgz] |
|---|---|---|
| author | Sam Saccone <[email protected]> | Tue Jul 18 18:41:57 2023 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Tue Jul 18 18:41:57 2023 +0000 |
| tree | 1335b12c1234e96ca6fbaa9153c7c0f55f5c7761 | |
| parent | f858fea5a2f6d8b657ae78a7740a43c3b8632ead [diff] | |
| parent | 0b57c89760e0ba65238da7255ecd4800dbd60cd4 [diff] |
Move OWNER reference master=>main. am: 0b57c89760 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/fastrand/+/2662425 Change-Id: Ia817bcf34052a95384ab510255f161475e45a45c 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.