Enum halfbrown::RawEntryMut
source · [−]pub enum RawEntryMut<'map, K, V, S> {
Occupied(RawOccupiedEntryMut<'map, K, V, S>),
Vacant(RawVacantEntryMut<'map, K, V, S>),
}
Expand description
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<'map, K, V, S>)
An occupied entry.
Vacant(RawVacantEntryMut<'map, K, V, S>)
A vacant entry.
Implementations
sourceimpl<'map, K, V, S> RawEntryMut<'map, K, V, S> where
S: BuildHasher,
impl<'map, K, V, S> RawEntryMut<'map, K, V, S> where
S: BuildHasher,
sourcepub fn insert(self, key: K, value: V) -> RawOccupiedEntryMut<'map, K, V, S> where
K: Hash,
S: BuildHasher,
pub fn insert(self, key: K, value: V) -> RawOccupiedEntryMut<'map, K, V, S> where
K: Hash,
S: BuildHasher,
Sets the value of the entry, and returns a RawOccupiedEntryMut
.
Examples
use hashbrown::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
let entry = map.raw_entry_mut().from_key("horseyland").insert("horseyland", 37);
assert_eq!(entry.remove_entry(), ("horseyland", 37));
sourcepub fn or_insert(
self,
default_key: K,
default_val: V
) -> (&'map mut K, &'map mut V) where
K: Hash,
S: BuildHasher,
pub fn or_insert(
self,
default_key: K,
default_val: V
) -> (&'map mut K, &'map mut V) where
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
use hashbrown::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);
sourcepub fn or_insert_with<F>(self, default: F) -> (&'map mut K, &'map mut V) where
F: FnOnce() -> (K, V),
K: Hash,
S: BuildHasher,
pub fn or_insert_with<F>(self, default: F) -> (&'map mut K, &'map mut V) where
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
use hashbrown::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());
sourcepub fn and_modify<F>(self, f: F) -> Self where
F: FnOnce(&mut K, &mut V),
pub fn and_modify<F>(self, f: F) -> Self where
F: FnOnce(&mut K, &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.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);
Trait Implementations
sourceimpl<K: Debug, V: Debug, S> Debug for RawEntryMut<'_, K, V, S> where
S: BuildHasher,
impl<K: Debug, V: Debug, S> Debug for RawEntryMut<'_, K, V, S> where
S: BuildHasher,
sourceimpl<'map, K, V, S> From<RawEntryMut<'map, K, V, S, Global>> for RawEntryMut<'map, K, V, S>
impl<'map, K, V, S> From<RawEntryMut<'map, K, V, S, Global>> for RawEntryMut<'map, K, V, S>
sourcefn from(e: RawEntryMut<'map, K, V, S>) -> Self
fn from(e: RawEntryMut<'map, K, V, S>) -> Self
Performs the conversion.
Auto Trait Implementations
impl<'map, K, V, S> RefUnwindSafe for RawEntryMut<'map, K, V, S> where
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
impl<'map, K, V, S> Send for RawEntryMut<'map, K, V, S> where
K: Send,
S: Send + Sync,
V: Send,
impl<'map, K, V, S> Sync for RawEntryMut<'map, K, V, S> where
K: Sync,
S: Sync,
V: Sync,
impl<'map, K, V, S> Unpin for RawEntryMut<'map, K, V, S>
impl<'map, K, V, S> !UnwindSafe for RawEntryMut<'map, K, V, S>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more