stdx/
rand.rs

1//! We don't use `rand` because that is too many things for us.
2//!
3//! `oorandom` is used instead, but it's missing these two utilities.
4//! Switching to `fastrand` or our own small PRNG may be good because only xor-shift is needed.
5
6pub fn shuffle<T>(slice: &mut [T], mut rand_index: impl FnMut(usize) -> usize) {
7    let mut remaining = slice.len() - 1;
8    while remaining > 0 {
9        let index = rand_index(remaining);
10        slice.swap(remaining, index);
11        remaining -= 1;
12    }
13}
14
15pub fn seed() -> u64 {
16    use std::hash::{BuildHasher, Hasher};
17    #[allow(clippy::disallowed_types)]
18    std::collections::hash_map::RandomState::new().build_hasher().finish()
19}
stdx/rand.rs

stdx/
rand.rs
