Struct slab_typesafe::VacantEntry
source · Expand description
A handle to an vacant entry in a Slab
.
VacantEntry
allows constructing values with the key that they will be
assigned to.
Examples
#[macro_use] extern crate slab_typesafe;
declare_slab_token!(MyIndex);
let mut slab : Slab<MyIndex, _> = 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
sourceimpl<'a, K: Into<usize> + From<usize>, V: 'a> VacantEntry<'a, K, V>
impl<'a, K: Into<usize> + From<usize>, V: 'a> VacantEntry<'a, K, V>
sourcepub fn insert(self, val: V) -> &'a mut V
pub fn insert(self, val: V) -> &'a mut V
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
#[macro_use] extern crate slab_typesafe;
declare_slab_token!(MyIndex);
let mut slab : Slab<MyIndex, _> = Slab::new();
let hello = {
let entry = slab.vacant_entry();
let key : MyIndex = entry.key();
entry.insert((key, "hello"));
key
};
assert_eq!(hello, slab[hello].0);
assert_eq!("hello", slab[hello].1);
sourcepub fn key(&self) -> K
pub fn key(&self) -> K
Return the key associated with this entry.
A value stored in this entry will be associated with this key.
Examples
#[macro_use] extern crate slab_typesafe;
declare_slab_token!(MyIndex);
let mut slab : Slab <MyIndex, _> = Slab::new();
let hello = {
let entry = slab.vacant_entry();
let key : MyIndex = entry.key();
entry.insert((key, "hello"));
key
};
assert_eq!(hello, slab[hello].0);
assert_eq!("hello", slab[hello].1);
Trait Implementations
Auto Trait Implementations
impl<'a, K, V> RefUnwindSafe for VacantEntry<'a, K, V>where
K: RefUnwindSafe,
V: RefUnwindSafe,
impl<'a, K, V> Send for VacantEntry<'a, K, V>where
K: Send,
V: Send,
impl<'a, K, V> Sync for VacantEntry<'a, K, V>where
K: Sync,
V: Sync,
impl<'a, K, V> Unpin for VacantEntry<'a, K, V>where
K: Unpin,
impl<'a, K, V> !UnwindSafe for VacantEntry<'a, K, V>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more