Struct sharded_slab::VacantEntry

pub struct VacantEntry<'a, T, C: Config = DefaultConfig> { /* private fields */ }

A handle to a vacant entry in a Slab.

VacantEntry allows constructing values with the key that they will be assigned to.

Examples

let mut slab = Slab::new();

let hello = {
    let entry = slab.vacant_entry().unwrap();
    let key = entry.key();

    entry.insert((key, "hello"));
    key
};

assert_eq!(hello, slab.get(hello).unwrap().0);
assert_eq!("hello", slab.get(hello).unwrap().1);

Implementations

impl<'a, T, C: Config> VacantEntry<'a, T, C>

pub fn insert(self, val: T)

Insert a value in the entry.

To get the integer index at which this value will be inserted, use key prior to calling insert.

Examples

let mut slab = Slab::new();

let hello = {
    let entry = slab.vacant_entry().unwrap();
    let key = entry.key();

    entry.insert((key, "hello"));
    key
};

assert_eq!(hello, slab.get(hello).unwrap().0);
assert_eq!("hello", slab.get(hello).unwrap().1);

pub fn key(&self) -> usize

Return the integer index at which this entry will be inserted.

A value stored in this entry will be associated with this key.

Examples

let mut slab = Slab::new();

let hello = {
    let entry = slab.vacant_entry().unwrap();
    let key = entry.key();

    entry.insert((key, "hello"));
    key
};

assert_eq!(hello, slab.get(hello).unwrap().0);
assert_eq!("hello", slab.get(hello).unwrap().1);

Trait Implementations

impl<'a, T: Debug, C: Debug + Config> Debug for VacantEntry<'a, T, C>

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

Formats the value using the given formatter.