# Enum collections::btree_map::Entry [−] [src]

    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.

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