Struct halfbrown::VacantEntry
source · pub struct VacantEntry<'a, K, V, const N: usize, S>(/* private fields */);
Expand description
A view into a vacant entry in a HashMap
.
It is part of the Entry
enum.
Implementations§
source§impl<'a, K, V, const N: usize, S> VacantEntry<'a, K, V, N, S>
impl<'a, K, V, const N: usize, S> VacantEntry<'a, K, V, N, S>
sourcepub fn key(&self) -> &K
pub fn key(&self) -> &K
Gets a reference to the key that would be used when inserting a value
through the VacantEntry
.
§Examples
use halfbrown::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
assert_eq!(map.entry("poneyland").key(), &"poneyland");
sourcepub fn into_key(self) -> K
pub fn into_key(self) -> K
Take ownership of the key.
§Examples
use halfbrown::HashMap;
use halfbrown::Entry;
let mut map: HashMap<&str, u32> = HashMap::new();
if let Entry::Vacant(v) = map.entry("poneyland") {
v.into_key();
}
sourcepub fn insert(self, value: V) -> &'a mut Vwhere
K: Hash,
S: BuildHasher,
pub fn insert(self, value: V) -> &'a mut Vwhere
K: Hash,
S: BuildHasher,
Sets the value of the entry with the VacantEntry
’s key,
and returns a mutable reference to it.
§Examples
use halfbrown::HashMap;
use halfbrown::Entry;
let mut map: HashMap<&str, u32> = HashMap::new();
if let Entry::Vacant(o) = map.entry("poneyland") {
o.insert(37);
}
assert_eq!(map["poneyland"], 37);
Trait Implementations§
Auto Trait Implementations§
impl<'a, K, V, const N: usize, S> RefUnwindSafe for VacantEntry<'a, K, V, N, S>
impl<'a, K, V, const N: usize, S> Send for VacantEntry<'a, K, V, N, S>
impl<'a, K, V, const N: usize, S> Sync for VacantEntry<'a, K, V, N, S>
impl<'a, K, V, const N: usize, S> Unpin for VacantEntry<'a, K, V, N, S>where
K: Unpin,
impl<'a, K, V, const N: usize, S> !UnwindSafe for VacantEntry<'a, K, V, N, S>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more