Enum hashbrown::hash_map::Entry [−][src]
A view into a single entry in a map, which may either be vacant or occupied.
Variants
Occupied(OccupiedEntry<'a, K, V, S>)
An occupied entry.
Vacant(VacantEntry<'a, K, V, S>)
A vacant entry.
Implementations
impl<'a, K, V, S> Entry<'a, K, V, S>
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pub fn insert(self, value: V) -> OccupiedEntry<'a, K, V, S> where
K: Hash,
S: BuildHasher,
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K: Hash,
S: BuildHasher,
Sets the value of the entry, and returns an OccupiedEntry.
Examples
use hashbrown::HashMap; let mut map: HashMap<&str, u32> = HashMap::new(); let entry = map.entry("horseyland").insert(37); assert_eq!(entry.key(), &"horseyland");
pub fn or_insert(self, default: V) -> &'a mut V where
K: Hash,
S: BuildHasher,
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K: Hash,
S: BuildHasher,
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 hashbrown::HashMap; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland").or_insert(3); assert_eq!(map["poneyland"], 3); *map.entry("poneyland").or_insert(10) *= 2; assert_eq!(map["poneyland"], 6);
pub fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut V where
K: Hash,
S: BuildHasher,
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K: Hash,
S: BuildHasher,
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 hashbrown::HashMap; let mut map: HashMap<&str, String> = HashMap::new(); let s = "hoho".to_string(); map.entry("poneyland").or_insert_with(|| s); assert_eq!(map["poneyland"], "hoho".to_string());
pub fn or_insert_with_key<F: FnOnce(&K) -> V>(self, default: F) -> &'a mut V where
K: Hash,
S: BuildHasher,
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K: Hash,
S: BuildHasher,
Ensures a value is in the entry by inserting, if empty, the result of the default function, which takes the key as its argument, and returns a mutable reference to the value in the entry.
Examples
use hashbrown::HashMap; let mut map: HashMap<&str, usize> = HashMap::new(); map.entry("poneyland").or_insert_with_key(|key| key.chars().count()); assert_eq!(map["poneyland"], 9);
pub fn key(&self) -> &K
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Returns a reference to this entry’s key.
Examples
use hashbrown::HashMap; let mut map: HashMap<&str, u32> = HashMap::new(); assert_eq!(map.entry("poneyland").key(), &"poneyland");
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 hashbrown::HashMap; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland") .and_modify(|e| { *e += 1 }) .or_insert(42); assert_eq!(map["poneyland"], 42); map.entry("poneyland") .and_modify(|e| { *e += 1 }) .or_insert(42); assert_eq!(map["poneyland"], 43);
pub fn and_replace_entry_with<F>(self, f: F) -> Self where
F: FnOnce(&K, V) -> Option<V>,
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F: FnOnce(&K, V) -> Option<V>,
Provides shared access to the key and owned access to the value of an occupied entry and allows to replace or remove it based on the value of the returned option.
Examples
use hashbrown::HashMap; use hashbrown::hash_map::Entry; let mut map: HashMap<&str, u32> = HashMap::new(); let entry = map .entry("poneyland") .and_replace_entry_with(|_k, _v| panic!()); match entry { Entry::Vacant(e) => { assert_eq!(e.key(), &"poneyland"); } Entry::Occupied(_) => panic!(), } map.insert("poneyland", 42); let entry = map .entry("poneyland") .and_replace_entry_with(|k, v| { assert_eq!(k, &"poneyland"); assert_eq!(v, 42); Some(v + 1) }); match entry { Entry::Occupied(e) => { assert_eq!(e.key(), &"poneyland"); assert_eq!(e.get(), &43); } Entry::Vacant(_) => panic!(), } assert_eq!(map["poneyland"], 43); let entry = map .entry("poneyland") .and_replace_entry_with(|_k, _v| None); match entry { Entry::Vacant(e) => assert_eq!(e.key(), &"poneyland"), Entry::Occupied(_) => panic!(), } assert!(!map.contains_key("poneyland"));
impl<'a, K, V: Default, S> Entry<'a, K, V, S>
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pub fn or_default(self) -> &'a mut V where
K: Hash,
S: BuildHasher,
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K: Hash,
S: BuildHasher,
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 hashbrown::HashMap; let mut map: HashMap<&str, Option<u32>> = HashMap::new(); map.entry("poneyland").or_default(); assert_eq!(map["poneyland"], None);
Trait Implementations
Auto Trait Implementations
impl<'a, K, V, S> Send for Entry<'a, K, V, S> where
K: Send,
S: Send,
V: Send,
K: Send,
S: Send,
V: Send,
impl<'a, K, V, S> Sync for Entry<'a, K, V, S> where
K: Sync,
S: Sync,
V: Sync,
K: Sync,
S: Sync,
V: Sync,
impl<'a, K, V, S> Unpin for Entry<'a, K, V, S> where
K: Unpin,
K: Unpin,
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>,