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

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

Expand description

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>)`

Tuple Fields

0: RawOccupiedEntryMut<'a, K, V>

An occupied entry.

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

Tuple Fields

0: RawVacantEntryMut<'a, K, V, S>

A vacant entry.

Implementations

[src]

impl<'a, K, V, S> RawEntryMut<'a, K, V, S>

[src]

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

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));

[src]

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

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);

[src]

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

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());

[src]

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

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);