tag | 882767ad1dd53481368f507155e45188f23092ad | |
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tagger | The Android Open Source Project <initial-contribution@android.com> | Mon Apr 29 10:40:01 2024 -0700 |
object | 52705f0e6287e093765bcb983156ab2378fc088a |
aml_tz5_341510070 (11568892,com.google.android.go.tzdata5,com.google.android.tzdata5)
commit | 52705f0e6287e093765bcb983156ab2378fc088a | [log] [tgz] |
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author | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Wed May 10 16:17:08 2023 +0000 |
committer | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Wed May 10 16:17:08 2023 +0000 |
tree | db504e270310dcd06e1372842ea617bccc9a5852 | |
parent | 7fc21f675f2a32fa96a8c14368b1148610358459 [diff] | |
parent | ca4cfed67823b583c62aca9f2a20d3cd699afe11 [diff] |
Snap for 10103804 from ca4cfed67823b583c62aca9f2a20d3cd699afe11 to mainline-tzdata5-release Change-Id: Id0814c0ee4a70d7f1a9f984e53beb308b2143b6c
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.