Method or_insert_with_key

src/entity/sparse.rs:408–419

(self, call: F)

    where
        F: FnOnce(&K) -> V,
    {
        match self {
            Entry::Occupied(entry) => entry.into_mut(),
            Entry::Vacant(entry) => {
                let value = call(&entry.key);
                entry.insert(value)
            }
        }
    }

    /// Gets the entry's key.
    #[inline]
    pub fn key(&self) -> K {
        match *self {
            Entry::Occupied(ref entry) => entry.key(),