# Enum hashbrown::hash_map::RawEntryMut [−] [src]

    pub enum RawEntryMut<'a, K, V, S> {
        Occupied(RawOccupiedEntryMut<'a, K, V, S>),
        Vacant(RawVacantEntryMut<'a, K, V, S>),
    }

A view into a single entry in a map, which may either be vacant or occupied.

This is a lower-level version of `Entry`.

This `enum` is constructed through the `raw_entry_mut` method on `HashMap`, then calling one of the methods of that `RawEntryBuilderMut`.

## Variants

`Occupied(RawOccupiedEntryMut<'a, K, V, S>)`

An occupied entry.

`Vacant(RawVacantEntryMut<'a, K, V, S>)`

A vacant entry.

## Implementations

### `impl<'a, K, V, S> RawEntryMut<'a, K, V, S>` [src]

#### `pub fn insert(self, key: K, value: V) -> RawOccupiedEntryMut<'a, K, V, S> where
K: Hash,
S: BuildHasher,` [src]

Sets the value of the entry, and returns a RawOccupiedEntryMut.

# Examples

    use hashbrown::HashMap;

    let mut map: HashMap<&str, u32> = HashMap::new();
    let entry = map.raw_entry_mut().from_key("horseyland").insert("horseyland", 37);

    assert_eq!(entry.remove_entry(), ("horseyland", 37));

#### `pub fn or_insert(self, default_key: K, default_val: V) -> (&'a mut K, &'a mut V) where
K: Hash,
S: BuildHasher,` [src]

Ensures a value is in the entry by inserting the default if empty, and returns mutable references to the key and value in the entry.

# Examples

    use hashbrown::HashMap;

    let mut map: HashMap<&str, u32> = HashMap::new();

    map.raw_entry_mut().from_key("poneyland").or_insert("poneyland", 3);
    assert_eq!(map["poneyland"], 3);

    *map.raw_entry_mut().from_key("poneyland").or_insert("poneyland", 10).1 *= 2;
    assert_eq!(map["poneyland"], 6);

#### `pub fn or_insert_with<F>(self, default: F) -> (&'a mut K, &'a mut V) where
F: FnOnce() -> (K, V),
K: Hash,
S: BuildHasher,` [src]

Ensures a value is in the entry by inserting the result of the default function if empty, and returns mutable references to the key and value in the entry.

# Examples

    use hashbrown::HashMap;

    let mut map: HashMap<&str, String> = HashMap::new();

    map.raw_entry_mut().from_key("poneyland").or_insert_with(|| {
        ("poneyland", "hoho".to_string())
    });

    assert_eq!(map["poneyland"], "hoho".to_string());

#### `pub fn and_modify<F>(self, f: F) -> Self where
F: FnOnce(&mut K, &mut V),` [src]

Provides in-place mutable access to an occupied entry before any potential inserts into the map.

# Examples

    use hashbrown::HashMap;

    let mut map: HashMap<&str, u32> = HashMap::new();

    map.raw_entry_mut()
       .from_key("poneyland")
       .and_modify(|_k, v| { *v += 1 })
       .or_insert("poneyland", 42);
    assert_eq!(map["poneyland"], 42);

    map.raw_entry_mut()
       .from_key("poneyland")
       .and_modify(|_k, v| { *v += 1 })
       .or_insert("poneyland", 0);
    assert_eq!(map["poneyland"], 43);

#### `pub fn and_replace_entry_with<F>(self, f: F) -> Self where
F: FnOnce(&K, V) -> Option<V>,` [src]

Provides shared access to the key and owned access to the value of an occupied entry and allows to replace or remove it based on the value of the returned option.

# Examples

    use hashbrown::HashMap;
    use hashbrown::hash_map::RawEntryMut;

    let mut map: HashMap<&str, u32> = HashMap::new();

    let entry = map
        .raw_entry_mut()
        .from_key("poneyland")
        .and_replace_entry_with(|_k, _v| panic!());

    match entry {
        RawEntryMut::Vacant(_) => {},
        RawEntryMut::Occupied(_) => panic!(),
    }

    map.insert("poneyland", 42);

    let entry = map
        .raw_entry_mut()
        .from_key("poneyland")
        .and_replace_entry_with(|k, v| {
            assert_eq!(k, &"poneyland");
            assert_eq!(v, 42);
            Some(v + 1)
        });

    match entry {
        RawEntryMut::Occupied(e) => {
            assert_eq!(e.key(), &"poneyland");
            assert_eq!(e.get(), &43);
        },
        RawEntryMut::Vacant(_) => panic!(),
    }

    assert_eq!(map["poneyland"], 43);

    let entry = map
        .raw_entry_mut()
        .from_key("poneyland")
        .and_replace_entry_with(|_k, _v| None);

    match entry {
        RawEntryMut::Vacant(_) => {},
        RawEntryMut::Occupied(_) => panic!(),
    }

    assert!(!map.contains_key("poneyland"));

## Trait Implementations

### `impl<K: Debug, V: Debug, S> Debug for RawEntryMut<'_, K, V, S>` [src]

#### `fn fmt(&self, f: &mut Formatter<'_>) -> Result` [src]

Formats the value using the given formatter. Read more

## Auto Trait Implementations

### `impl<'a, K, V, S> Send for RawEntryMut<'a, K, V, S> where
K: Send,
S: Sync,
V: Send,`

### `impl<'a, K, V, S> Sync for RawEntryMut<'a, K, V, S> where
K: Sync,
S: Sync,
V: Sync,`

### `impl<'a, K, V, S> Unpin for RawEntryMut<'a, K, V, S>`

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId` [src]

Gets the `TypeId` of `self`. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &T` [src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut T` [src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T` [src]

#### `pub fn from(t: T) -> T` [src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U` [src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>` [src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>` [src]

Performs the conversion.