Struct cow_hashmap::VacantEntry

pub struct VacantEntry<K: Clone, V, S> { /* private fields */ }

A view into a vacant entry in a HashMap. It is part of the Entry enum.

Implementations

impl<K: Clone, V, S> VacantEntry<K, V, S>

pub fn key(&self) -> &K

Gets a reference to the key that would be used when inserting a value through the VacantEntry.

Examples

use cow_hashmap::CowHashMap as HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();
assert_eq!(map.entry("poneyland").key(), &"poneyland");

pub fn into_key(self) -> K

Take ownership of the key.

Examples

use cow_hashmap::CowHashMap as HashMap;
use cow_hashmap::Entry;

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

if let Entry::Vacant(v) = map.entry("poneyland") {
    v.into_key();
}

pub fn insert(self, value: V) -> Arc<V>

where K: Hash, S: BuildHasher,

Sets the value of the entry with the VacantEntry’s key, and returns a mutable reference to it.

Examples

use cow_hashmap::CowHashMap as HashMap;
use cow_hashmap::Entry;
use std::sync::Arc;

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

if let Entry::Vacant(o) = map.entry("poneyland") {
    o.insert(37);
}
assert_eq!(map.get("poneyland").unwrap(), Arc::new(37));

pub fn insert_mut(self, value: V) -> CowValueGuard<V>

where K: Hash, S: BuildHasher, V: Clone,

Sets the value of the entry with the VacantEntry’s key, and returns a mutable reference to it.

Examples

use cow_hashmap::CowHashMap as HashMap;
use cow_hashmap::Entry;
use std::sync::Arc;

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

if let Entry::Vacant(o) = map.entry("poneyland") {
    o.insert(37);
}
assert_eq!(map.get("poneyland").unwrap(), Arc::new(37));

Trait Implementations

impl<K: Clone + Debug, V, S> Debug for VacantEntry<K, V, S>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.