opthash 0.10.4

Rust implementations of Elastic Hashing and Funnel Hashing
Documentation 
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pub(crate) mod arena;
pub(crate) mod bitmask;
pub(crate) mod config;
pub(crate) mod control;
pub(crate) mod error;
pub(crate) mod exact;
pub(crate) mod iter;
pub(crate) mod math;
pub(crate) mod membership;
pub(crate) mod reserve;
pub(crate) mod simd;

/// Default `BuildHasher` for the maps' `S` type parameter.
///
/// Always exists so the `S = DefaultHashBuilder` defaults on the public type
/// aliases stay valid, but only implements [`core::hash::BuildHasher`] when the
/// `default-hasher` feature is enabled (wrapping [`foldhash::fast::RandomState`]).
/// With the feature off it is an empty placeholder and callers must supply an
/// explicit hasher `S`.
#[derive(Clone, Debug, Default)]
pub struct DefaultHashBuilder {
    #[cfg(feature = "default-hasher")]
    inner: foldhash::fast::RandomState,
}

#[cfg(feature = "default-hasher")]
impl core::hash::BuildHasher for DefaultHashBuilder {
    type Hasher = <foldhash::fast::RandomState as core::hash::BuildHasher>::Hasher;

    #[inline]
    fn build_hasher(&self) -> Self::Hasher {
        self.inner.build_hasher()
    }
}