Struct slab::VacantEntry
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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);
Methods
impl<'a, T> VacantEntry<'a, T>
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pub fn insert(self, val: T) -> &'a mut T
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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
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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);