weavatrix-search-vector 0.3.1

Persistent, mutable, bounded vector candidate search for Rust and Weavatrix
Documentation 
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use std::cmp::Ordering;

#[derive(Debug, Clone, Copy)]
pub(crate) struct Candidate {
    pub(crate) distance: f32,
    node: u32,
}

#[derive(Debug, Clone, Copy)]
pub(crate) struct RoutingCandidate {
    pub(super) score: f32,
    pub(super) mask: u16,
    pub(super) last: u8,
    pub(super) bits: u8,
}

impl RoutingCandidate {
    pub(super) fn new(score: f32, mask: u16, bits: u8) -> Self {
        Self {
            score,
            mask,
            last: 0,
            bits,
        }
    }
}

impl PartialEq for RoutingCandidate {
    fn eq(&self, other: &Self) -> bool {
        self.cmp(other) == Ordering::Equal
    }
}

impl Eq for RoutingCandidate {}

impl PartialOrd for RoutingCandidate {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl Ord for RoutingCandidate {
    fn cmp(&self, other: &Self) -> Ordering {
        self.score
            .total_cmp(&other.score)
            .then_with(|| self.mask.cmp(&other.mask))
    }
}

impl Candidate {
    pub(crate) fn new(distance: f32, index: usize) -> Self {
        Self {
            distance,
            node: u32::try_from(index).expect("vector count is bounded by u32::MAX"),
        }
    }

    pub(crate) fn index(self) -> usize {
        self.node as usize
    }
}

impl PartialEq for Candidate {
    fn eq(&self, other: &Self) -> bool {
        self.cmp(other) == Ordering::Equal
    }
}

impl Eq for Candidate {}

impl PartialOrd for Candidate {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl Ord for Candidate {
    fn cmp(&self, other: &Self) -> Ordering {
        self.distance
            .total_cmp(&other.distance)
            .then_with(|| self.node.cmp(&other.node))
    }
}

pub(crate) fn splitmix64(mut value: u64) -> u64 {
    value = value.wrapping_add(0x9e37_79b9_7f4a_7c15);
    value = (value ^ (value >> 30)).wrapping_mul(0xbf58_476d_1ce4_e5b9);
    value = (value ^ (value >> 27)).wrapping_mul(0x94d_49bb_1331_11eb);
    value ^ (value >> 31)
}