Enum halfbrown::RawEntryMut
source · pub enum RawEntryMut<'map, K, V, const N: usize, S> {
Occupied(RawOccupiedEntryMut<'map, K, V, N, S>),
Vacant(RawVacantEntryMut<'map, K, V, N, 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, N, S>)
An occupied entry.
Vacant(RawVacantEntryMut<'map, K, V, N, S>)
A vacant entry.
Implementations§
source§impl<'map, K, V, const N: usize, S> RawEntryMut<'map, K, V, N, S>where
S: BuildHasher,
impl<'map, K, V, const N: usize, S> RawEntryMut<'map, K, V, N, S>where
S: BuildHasher,
sourcepub fn insert(self, key: K, value: V) -> RawOccupiedEntryMut<'map, K, V, N, S>where
K: Hash,
S: BuildHasher,
pub fn insert(self, key: K, value: V) -> RawOccupiedEntryMut<'map, K, V, N, 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)
pub fn or_insert_with<F>(self, default: F) -> (&'map mut K, &'map mut V)
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
pub fn and_modify<F>(self, f: F) -> Self
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§
source§impl<K: Debug, V: Debug, const N: usize, S> Debug for RawEntryMut<'_, K, V, N, S>where
S: BuildHasher,
impl<K: Debug, V: Debug, const N: usize, S> Debug for RawEntryMut<'_, K, V, N, S>where
S: BuildHasher,
source§impl<'map, K, V, const N: usize, S> From<RawEntryMut<'map, K, V, S>> for RawEntryMut<'map, K, V, N, S>
impl<'map, K, V, const N: usize, S> From<RawEntryMut<'map, K, V, S>> for RawEntryMut<'map, K, V, N, S>
source§fn from(e: RawEntryMut<'map, K, V, S>) -> Self
fn from(e: RawEntryMut<'map, K, V, S>) -> Self
Converts to this type from the input type.
Auto Trait Implementations§
impl<'map, K, V, const N: usize, S> RefUnwindSafe for RawEntryMut<'map, K, V, N, S>
impl<'map, K, V, const N: usize, S> Send for RawEntryMut<'map, K, V, N, S>
impl<'map, K, V, const N: usize, S> Sync for RawEntryMut<'map, K, V, N, S>
impl<'map, K, V, const N: usize, S> Unpin for RawEntryMut<'map, K, V, N, S>
impl<'map, K, V, const N: usize, S> !UnwindSafe for RawEntryMut<'map, K, V, N, S>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more