[−][src]Enum cache_2q::Entry
A view into a single entry in a cache, which may either be vacant or occupied.
This enum is constructed from the entry method on Cache.
Variants
Occupied(OccupiedEntry<'a, K, V, S>)
An occupied entry
Vacant(VacantEntry<'a, K, V, S>)
An vacant entry
Implementations
impl<'a, K: 'a + Eq + Hash, V: 'a, S: 'a + BuildHasher> Entry<'a, K, V, S>
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pub fn key(&self) -> &K
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Returns a reference to this entry's key.
Examples
use cache_2q::Cache; let mut cache: Cache<&str, u32> = Cache::new(8); assert_eq!(cache.entry("poneyland").key(), &"poneyland");
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
use cache_2q::Cache; let mut cache = Cache::new(8); { let value = cache.entry(0xFF00).or_insert(0); assert_eq!(*value, 0); } *cache.entry(0xFF00).or_insert(100) += 1; assert_eq!(*cache.get(&0xFF00).unwrap(), 1);
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
use cache_2q::Cache; let mut cache: Cache<&'static str, String> = Cache::new(8); cache.entry("key").or_insert_with(|| "value".to_string()); assert_eq!(cache.get(&"key").unwrap(), &"value".to_string());
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
use cache_2q::Cache; let mut cache = Cache::new(1); cache.entry("poneyland") .and_modify(|e| { *e += 1 }) .or_insert(42); assert_eq!(*cache.get("poneyland").unwrap(), 42); cache.entry("poneyland") .and_modify(|e| { *e += 1 }) .or_insert(42); assert_eq!(*cache.get("poneyland").unwrap(), 43);
impl<'a, K: 'a + Eq + Hash, V: 'a + Default, S: 'a + BuildHasher> Entry<'a, K, V, S>
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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
use cache_2q::Cache; let mut cache = Cache::new(1); assert_eq!(*cache.entry(1).or_default(), 0u8); assert_eq!(cache.get(&1), Some(&mut 0))
Trait Implementations
impl<'a, K: 'a + Debug + Eq + Hash, V: 'a + Debug, S: 'a + BuildHasher> Debug for Entry<'a, K, V, S>
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Auto Trait Implementations
impl<'a, K, V, S> RefUnwindSafe for Entry<'a, K, V, S> where
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
impl<'a, K, V, S = RandomState> !Send for Entry<'a, K, V, S>
impl<'a, K, V, S = RandomState> !Sync for Entry<'a, K, V, S>
impl<'a, K, V, S> Unpin for Entry<'a, K, V, S> where
K: Unpin,
K: Unpin,
impl<'a, K, V, S = RandomState> !UnwindSafe for Entry<'a, K, V, S>
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,
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.
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>,