# Struct std::collections::btree_map::OccupiedEntry 1.0.0 [−] [src]

    pub struct OccupiedEntry<'a, K, V> where K: 'a, V: 'a { /* fields omitted */ }

An occupied Entry. It is part of the `Entry` enum.

## Methods

### `impl<'a, K, V> OccupiedEntry<'a, K, V> where K: Ord`
[src]

#### `fn key(&self) -> &K`
1.10.0

Gets a reference to the key in the entry.

# Examples

    use std::collections::BTreeMap;

    let mut map: BTreeMap<&str, usize> = BTreeMap::new();
    map.entry("poneyland").or_insert(12);
    assert_eq!(map.entry("poneyland").key(), &"poneyland");Run

#### `fn remove_pair(self) -> (K, V)`

Deprecated since 1.12.0

: renamed to `remove_entry`

🔬 This is a nightly-only experimental API. (`map_entry_recover_keys` #34285)

Deprecated, renamed to `remove_entry`

#### `fn remove_entry(self) -> (K, V)`
1.12.0

Take ownership of the key and value from the map.

# Examples

    use std::collections::BTreeMap;
    use std::collections::btree_map::Entry;

    let mut map: BTreeMap<&str, usize> = BTreeMap::new();
    map.entry("poneyland").or_insert(12);

    if let Entry::Occupied(o) = map.entry("poneyland") {
        // We delete the entry from the map.
        o.remove_entry();
    }

    // If now try to get the value, it will panic:
    // println!("{}", map["poneyland"]);Run

#### `fn get(&self) -> &V`

Gets a reference to the value in the entry.

# Examples

    use std::collections::BTreeMap;
    use std::collections::btree_map::Entry;

    let mut map: BTreeMap<&str, usize> = BTreeMap::new();
    map.entry("poneyland").or_insert(12);

    if let Entry::Occupied(o) = map.entry("poneyland") {
        assert_eq!(o.get(), &12);
    }Run

#### `fn get_mut(&mut self) -> &mut V`

Gets a mutable reference to the value in the entry.

# Examples

    use std::collections::BTreeMap;
    use std::collections::btree_map::Entry;

    let mut map: BTreeMap<&str, usize> = BTreeMap::new();
    map.entry("poneyland").or_insert(12);

    assert_eq!(map["poneyland"], 12);
    if let Entry::Occupied(mut o) = map.entry("poneyland") {
         *o.get_mut() += 10;
    }
    assert_eq!(map["poneyland"], 22);Run

#### `fn into_mut(self) -> &'a mut V`

Converts the entry into a mutable reference to its value.

# Examples

    use std::collections::BTreeMap;
    use std::collections::btree_map::Entry;

    let mut map: BTreeMap<&str, usize> = BTreeMap::new();
    map.entry("poneyland").or_insert(12);

    assert_eq!(map["poneyland"], 12);
    if let Entry::Occupied(o) = map.entry("poneyland") {
        *o.into_mut() += 10;
    }
    assert_eq!(map["poneyland"], 22);Run

#### `fn insert(&mut self, value: V) -> V`

Sets the value of the entry with the `OccupiedEntry`'s key, and returns the entry's old value.

# Examples

    use std::collections::BTreeMap;
    use std::collections::btree_map::Entry;

    let mut map: BTreeMap<&str, usize> = BTreeMap::new();
    map.entry("poneyland").or_insert(12);

    if let Entry::Occupied(mut o) = map.entry("poneyland") {
        assert_eq!(o.insert(15), 12);
    }
    assert_eq!(map["poneyland"], 15);Run

#### `fn remove(self) -> V`

Takes the value of the entry out of the map, and returns it.

# Examples

    use std::collections::BTreeMap;
    use std::collections::btree_map::Entry;

    let mut map: BTreeMap<&str, usize> = BTreeMap::new();
    map.entry("poneyland").or_insert(12);

    if let Entry::Occupied(o) = map.entry("poneyland") {
        assert_eq!(o.remove(), 12);
    }
    // If we try to get "poneyland"'s value, it'll panic:
    // println!("{}", map["poneyland"]);Run

## Trait Implementations

### `impl<'a, K, V> Debug for OccupiedEntry<'a, K, V> where K: 'a + Ord + Debug,
V: 'a + Debug`
1.12.0
[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`

Formats the value using the given formatter.

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