[−][src]Enum slotmap::sparse_secondary::Entry
A view into a single entry in a SparseSecondaryMap
, which may either be
vacant or occupied.
This enum
is constructed using SparseSecondaryMap::entry
.
Variants
Occupied(OccupiedEntry<'a, K, V>)
An occupied entry.
Vacant(VacantEntry<'a, K, V>)
A vacant entry.
Implementations
impl<'a, K: Key, V> Entry<'a, K, V>
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pub fn or_insert(self, default: V) -> &'a mut V
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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 = SparseSecondaryMap::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);
pub fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut V
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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 = SparseSecondaryMap::new(); let k = sm.insert(1); let v = sec.entry(k).unwrap().or_insert_with(|| "foobar".to_string()); assert_eq!(v, &"foobar");
pub fn key(&self) -> K
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Returns this entry's key.
Examples
let mut sm = SlotMap::new(); let mut sec: SparseSecondaryMap<_, ()> = SparseSecondaryMap::new(); let k = sm.insert(1); let entry = sec.entry(k).unwrap(); assert_eq!(entry.key(), k);
pub fn and_modify<F>(self, f: F) -> Self where
F: FnOnce(&mut V),
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F: FnOnce(&mut V),
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 = SparseSecondaryMap::new(); let k = sm.insert(1); sec.insert(k, 0); sec.entry(k).unwrap().and_modify(|x| *x = 1); assert_eq!(sec[k], 1)
impl<'a, K: Key, V: Default> Entry<'a, K, V>
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pub fn or_default(self) -> &'a mut V
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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: SparseSecondaryMap<_, Option<i32>> = SparseSecondaryMap::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,
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V: RefUnwindSafe,
impl<'a, K, V> Send for Entry<'a, K, V> where
V: Send,
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V: Send,
impl<'a, K, V> Sync for Entry<'a, K, V> where
V: Sync,
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V: Sync,
impl<'a, K, V> Unpin for Entry<'a, K, V>
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impl<'a, K, V> !UnwindSafe for Entry<'a, K, V>
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Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,