Enum Entry

src/entity/sparse.rs:367–375

Entry for an existing key-value pair in an [`SparseMap`] or a vacant location to insert one.

where
    K: EntityRef,
{
    /// Existing slot with equivalent key.
    Occupied(OccupiedEntry<'a, K, V>),
    /// Vacant slot (no equivalent key in the map).
    Vacant(VacantEntry<'a, K, V>),
}

impl<'a, K, V> Entry<'a, K, V>
where
    K: EntityRef,
{
    /// Inserts the given default value in the entry if it is vacant and returns a mutable