Enum slotmap::secondary::Entry [−][src]
pub enum Entry<'a, K: Key, V> { Occupied(OccupiedEntry<'a, K, V>), Vacant(VacantEntry<'a, K, V>), }
Expand description
A view into a single entry in a SecondaryMap
, which may either be
vacant or occupied.
This enum
is constructed using SecondaryMap::entry
.
Variants
Occupied(OccupiedEntry<'a, K, V>)
An occupied entry.
Vacant(VacantEntry<'a, K, V>)
A vacant entry.
Implementations
Ensures a value is in the entry by inserting the default if empty, and returns a mutable reference to the value in the entry.
Examples
let mut sm = SlotMap::new(); let mut sec = SecondaryMap::new(); let k = sm.insert("poneyland"); let v = sec.entry(k).unwrap().or_insert(10); assert_eq!(*v, 10); *sec.entry(k).unwrap().or_insert(1) *= 2; assert_eq!(sec[k], 20);
Ensures a value is in the entry by inserting the result of the default function if empty, and returns a mutable reference to the value in the entry.
Examples
let mut sm = SlotMap::new(); let mut sec = SecondaryMap::new(); let k = sm.insert(1); let v = sec.entry(k).unwrap().or_insert_with(|| "foobar".to_string()); assert_eq!(v, &"foobar");
Returns this entry’s key.
Examples
let mut sm = SlotMap::new(); let mut sec: SecondaryMap<_, ()> = SecondaryMap::new(); let k = sm.insert(1); let entry = sec.entry(k).unwrap(); assert_eq!(entry.key(), k);
Provides in-place mutable access to an occupied entry before any potential inserts into the map.
Examples
let mut sm = SlotMap::new(); let mut sec = SecondaryMap::new(); let k = sm.insert(1); sec.insert(k, 0); sec.entry(k).unwrap().and_modify(|x| *x = 1); assert_eq!(sec[k], 1)
Ensures a value is in the entry by inserting the default value if empty, and returns a mutable reference to the value in the entry.
Examples
let mut sm = SlotMap::new(); let mut sec: SecondaryMap<_, Option<i32>> = SecondaryMap::new(); let k = sm.insert(1); sec.entry(k).unwrap().or_default(); assert_eq!(sec[k], None)
Trait Implementations
Auto Trait Implementations
impl<'a, K, V> RefUnwindSafe for Entry<'a, K, V> where
V: RefUnwindSafe,
impl<'a, K, V> !UnwindSafe for Entry<'a, K, V>