[−][src]Enum std::collections::hash_map::RawEntryMut
A view into a single entry in a map, which may either be vacant or occupied.
This is a lower-level version of Entry
.
This enum
is constructed through the raw_entry_mut
method on HashMap
,
then calling one of the methods of that RawEntryBuilderMut
.
Variants
Occupied(RawOccupiedEntryMut<'a, K, V>)
An occupied entry.
Vacant(RawVacantEntryMut<'a, K, V, S>)
A vacant entry.
Methods
impl<'a, K, V, S> RawEntryMut<'a, K, V, S>
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pub fn or_insert(self, default_key: K, default_val: V) -> (&'a mut K, &'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 mutable references to the key and value in the entry.
Examples
#![feature(hash_raw_entry)] use std::collections::HashMap; let mut map: HashMap<&str, u32> = HashMap::new(); map.raw_entry_mut().from_key("poneyland").or_insert("poneyland", 3); assert_eq!(map["poneyland"], 3); *map.raw_entry_mut().from_key("poneyland").or_insert("poneyland", 10).1 *= 2; assert_eq!(map["poneyland"], 6);Run
pub fn or_insert_with<F>(self, default: F) -> (&'a mut K, &'a mut V) where
F: FnOnce() -> (K, V),
K: Hash,
S: BuildHasher,
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F: FnOnce() -> (K, V),
K: Hash,
S: BuildHasher,
Ensures a value is in the entry by inserting the result of the default function if empty, and returns mutable references to the key and value in the entry.
Examples
#![feature(hash_raw_entry)] use std::collections::HashMap; let mut map: HashMap<&str, String> = HashMap::new(); map.raw_entry_mut().from_key("poneyland").or_insert_with(|| { ("poneyland", "hoho".to_string()) }); assert_eq!(map["poneyland"], "hoho".to_string());Run
pub fn and_modify<F>(self, f: F) -> Self where
F: FnOnce(&mut K, &mut V),
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F: FnOnce(&mut K, &mut V),
Provides in-place mutable access to an occupied entry before any potential inserts into the map.
Examples
#![feature(hash_raw_entry)] use std::collections::HashMap; let mut map: HashMap<&str, u32> = HashMap::new(); map.raw_entry_mut() .from_key("poneyland") .and_modify(|_k, v| { *v += 1 }) .or_insert("poneyland", 42); assert_eq!(map["poneyland"], 42); map.raw_entry_mut() .from_key("poneyland") .and_modify(|_k, v| { *v += 1 }) .or_insert("poneyland", 0); assert_eq!(map["poneyland"], 43);Run
Trait Implementations
impl<'_, K: Debug, V: Debug, S> Debug for RawEntryMut<'_, K, V, S>
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Auto Trait Implementations
impl<'a, K, V, S> !UnwindSafe for RawEntryMut<'a, K, V, S>
impl<'a, K, V, S> RefUnwindSafe for RawEntryMut<'a, K, V, S> where
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
impl<'a, K, V, S> Unpin for RawEntryMut<'a, K, V, S>
impl<'a, K, V, S> Send for RawEntryMut<'a, K, V, S> where
K: Send,
S: Sync,
V: Send,
K: Send,
S: Sync,
V: Send,
impl<'a, K, V, S> !Sync for RawEntryMut<'a, K, V, S>
Blanket Implementations
impl<T> From<T> for T
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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> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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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,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,