Enum collections::btree::map::Entry
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pub enum Entry<'a, K: 'a, V: 'a> { Vacant(VacantEntry<'a, K, V>), Occupied(OccupiedEntry<'a, K, V>), }
A view into a single entry in a map, which may either be vacant or occupied.
Variants
Vacant | A vacant Entry |
Occupied | An occupied Entry |
Methods
impl<'a, K: Ord, V> Entry<'a, K, V>
fn or_insert(self, default: V) -> &'a mut V
Ensures a value is in the entry by inserting the default if empty, and returns a mutable reference to the value in the entry.
fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut V
Ensures a value is in the entry by inserting the result of the default function if empty, and returns a mutable reference to the value in the entry.