Struct VacantEntry

pub struct VacantEntry<'a, K: Key, V> { /* private fields */ }

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

Implementations

impl<'a, K: Key, V> VacantEntry<'a, K, V>

pub fn key(&self) -> K

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

Examples

let mut sm = SlotMap::new();
let mut sec: SparseSecondaryMap<_, ()> = SparseSecondaryMap::new();

let k = sm.insert(1);

if let Entry::Vacant(v) = sec.entry(k).unwrap() {
    assert_eq!(v.key(), k);
}

pub fn insert(self, value: V) -> &'a mut V

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

Examples

let mut sm = SlotMap::new();
let mut sec = SparseSecondaryMap::new();

let k = sm.insert(1);

if let Entry::Vacant(v) = sec.entry(k).unwrap() {
    let new_val = v.insert(3);
    assert_eq!(new_val, &mut 3);
}

Trait Implementations

impl<'a, K: Debug + Key, V: Debug> Debug for VacantEntry<'a, K, V>

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

Formats the value using the given formatter.