afisp_rs 0.1.1

Clean-room Rust + PyO3 implementation of the AFISP core algorithms
Documentation 
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#[derive(Clone, Debug)]
pub struct SplitMix64 {
    state: u64,
}

impl SplitMix64 {
    pub fn new(seed: u64) -> Self {
        Self { state: seed }
    }

    pub fn next_u64(&mut self) -> u64 {
        self.state = self.state.wrapping_add(0x9E3779B97F4A7C15);
        let mut z = self.state;
        z = (z ^ (z >> 30)).wrapping_mul(0xBF58476D1CE4E5B9);
        z = (z ^ (z >> 27)).wrapping_mul(0x94D049BB133111EB);
        z ^ (z >> 31)
    }

    pub fn next_f64(&mut self) -> f64 {
        const SCALE: f64 = 1.0 / ((1u64 << 53) as f64);
        ((self.next_u64() >> 11) as f64) * SCALE
    }

    pub fn gen_index(&mut self, upper: usize) -> usize {
        if upper <= 1 {
            return 0;
        }
        (self.next_u64() % upper as u64) as usize
    }
}