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use std::hash::{BuildHasher, Hash, Hasher};

pub(crate) type FxHasher = std::hash::BuildHasherDefault<rustc_hash::FxHasher>;
pub(crate) type FxIndexSet<K> = indexmap::IndexSet<K, FxHasher>;
pub(crate) type FxIndexMap<K, V> = indexmap::IndexMap<K, V, FxHasher>;
pub(crate) type FxDashMap<K, V> = dashmap::DashMap<K, V, FxHasher>;
pub(crate) type FxLinkedHashSet<K> = hashlink::LinkedHashSet<K, FxHasher>;
pub(crate) type FxHashSet<K> = std::collections::HashSet<K, FxHasher>;

pub(crate) fn hash<T: Hash>(t: &T) -> u64 {
    let mut hasher = FxHasher::default().build_hasher();
    t.hash(&mut hasher);
    hasher.finish()
}