Struct slab::VacantEntry[−][src]

pub struct VacantEntry<'a, T: 'a> { /* fields omitted */ }

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();
    let key = entry.key();

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

assert_eq!(hello, slab[hello].0);
assert_eq!("hello", slab[hello].1);

Implementations

impl<'a, T> VacantEntry<'a, T>[src]

pub fn insert(self, val: T) -> &'a mut T[src]

Insert a value in the entry, returning a mutable reference to the value.

To get the key associated with the value, use key prior to calling insert.

Examples

let mut slab = Slab::new();

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

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

assert_eq!(hello, slab[hello].0);
assert_eq!("hello", slab[hello].1);

pub fn key(&self) -> usize[src]

Return the key associated with this entry.

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();
    let key = entry.key();

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

assert_eq!(hello, slab[hello].0);
assert_eq!("hello", slab[hello].1);

Trait Implementations

impl<'a, T: Debug + 'a> Debug for VacantEntry<'a, T>[src]

Auto Trait Implementations

impl<'a, T> RefUnwindSafe for VacantEntry<'a, T> where
    T: RefUnwindSafe, 

impl<'a, T> Send for VacantEntry<'a, T> where
    T: Send, 

impl<'a, T> Sync for VacantEntry<'a, T> where
    T: Sync, 

impl<'a, T> Unpin for VacantEntry<'a, T>

impl<'a, T> !UnwindSafe for VacantEntry<'a, T>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized, [src]

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, [src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.