lightning/
rand.rs

1use core::sync::atomic::AtomicUsize;
2use core::sync::atomic::Ordering::Relaxed;
3
4pub struct XorRand {
5    x: AtomicUsize,
6}
7
8impl XorRand {
9    pub fn new(seed: usize) -> Self {
10        Self {
11            x: AtomicUsize::new(seed),
12        }
13    }
14
15    pub fn rand(&self) -> usize {
16        let mut x = self.x.load(Relaxed);
17        x = self.x.fetch_xor(x.wrapping_shl(13), Relaxed);
18        x = self.x.fetch_xor(x.wrapping_shr(7), Relaxed);
19        self.x.fetch_xor(x.wrapping_shl(17), Relaxed);
20        self.x.load(Relaxed)
21    }
22
23    pub fn rand_range(&self, a: usize, b: usize) -> usize {
24        let m = b - a + 1;
25        return a + (self.rand() % m);
26    }
27}
lightning/rand.rs

lightning/
rand.rs
