Struct VacantEntry 

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

A view into a vacant entry in a SecondaryMap. 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: SecondaryMap<_, ()> = SecondaryMap::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 = SecondaryMap::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.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes