use std::hash::BuildHasher;

use std::hash::Hasher;

/// A hasher that directly uses the value provided to write_u64 as the hash

pub struct NoHasher(u64);

impl Hasher for NoHasher {

    /// Returns the current value as the hash

        // This implementation only supports write_u64

}

/// A builder for NoHasher. Starts with a hash of 0 and returns whatever value is passed to write_u64

#[derive(Default)]

pub struct NoHasherBuilder;

impl BuildHasher for NoHasherBuilder {

    type Hasher = NoHasher;

}

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

            42,

            "NoHasher should return the value passed to write_u64"

        );

            0,

            "NoHasherBuilder should create a hasher with initial value 0"

        );

}