Method drain

crates/core/src/slab.rs:491–502

(&mut self)

    /// Iteration order is undefined.
    #[inline]
    pub fn drain(&mut self) -> impl Iterator<Item = (Id, T)> + '_ {
        assert!(self.entries.len() <= Self::MAX_CAPACITY);
        self.len = 0;
        self.free = None;
        self.entries
            .drain(..)
            .enumerate()
            .filter_map(|(i, e)| match e {
                Entry::Occupied(x) => Some((Id(EntryIndex::new(i)), x)),
                Entry::Free { .. } => None,
            })
    }

    /// Clear all of the values from inside this slab.
    ///