Cuckoo

/// An edge in the Cuckoo graph, simply references two u64 nodes.
#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
struct Edge {
    u: u64,
    v: u64,
}

/// Cuckoo cycle context
pub struct Cuckoo {
    mask: u64,
    size: u64,
    v: [u64; 4],
}