pub enum Entry<'a, K, V, S, A = Global> where
A: Allocator + Clone, {
Occupied(OccupiedEntry<'a, K, V, S, A>),
Vacant(VacantEntry<'a, K, V, S, A>),
}
Expand description
Variants
Occupied(OccupiedEntry<'a, K, V, S, A>)
An occupied entry.
Vacant(VacantEntry<'a, K, V, S, A>)
A vacant entry.
Implementations
impl<'a, K, V, S, A> Entry<'a, K, V, S, A> where
A: Allocator + Clone,
impl<'a, K, V, S, A> Entry<'a, K, V, S, A> where
A: Allocator + Clone,
pub fn insert(self, value: V) -> OccupiedEntry<'a, K, V, S, A> where
K: Hash,
S: BuildHasher,
pub fn insert(self, value: V) -> OccupiedEntry<'a, K, V, S, A> where
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,
pub fn or_insert(self, default: V) -> &'a mut V where
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>(self, default: F) -> &'a mut V where
F: FnOnce() -> V,
K: Hash,
S: BuildHasher,
pub fn or_insert_with<F>(self, default: F) -> &'a mut V where
F: FnOnce() -> V,
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>(self, default: F) -> &'a mut V where
F: FnOnce(&K) -> V,
K: Hash,
S: BuildHasher,
pub fn or_insert_with_key<F>(self, default: F) -> &'a mut V where
F: FnOnce(&K) -> V,
K: Hash,
S: BuildHasher,
Ensures a value is in the entry by inserting, if empty, the result of the default function.
This method allows for generating key-derived values for insertion by providing the default
function a reference to the key that was moved during the .entry(key)
method call.
The reference to the moved key is provided so that cloning or copying the key is
unnecessary, unlike with .or_insert_with(|| ... )
.
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
pub fn key(&self) -> &K
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) -> Entry<'a, K, V, S, A> where
F: FnOnce(&mut V),
pub fn and_modify<F>(self, f: F) -> Entry<'a, K, V, S, A> where
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) -> Entry<'a, K, V, S, A> where
F: FnOnce(&K, V) -> Option<V>,
pub fn and_replace_entry_with<F>(self, f: F) -> Entry<'a, K, V, S, A> where
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, S, A> Entry<'a, K, V, S, A> where
V: Default,
A: Allocator + Clone,
impl<'a, K, V, S, A> Entry<'a, K, V, S, A> where
V: Default,
A: Allocator + Clone,
pub fn or_default(self) -> &'a mut V where
K: Hash,
S: BuildHasher,
pub fn or_default(self) -> &'a mut V where
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, A> RefUnwindSafe for Entry<'a, K, V, S, A> where
A: RefUnwindSafe,
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
impl<'a, K, V, S, A> Send for Entry<'a, K, V, S, A> where
A: Send,
K: Send,
S: Send,
V: Send,
impl<'a, K, V, S, A> Sync for Entry<'a, K, V, S, A> where
A: Sync,
K: Sync,
S: Sync,
V: Sync,
impl<'a, K, V, S, A> Unpin for Entry<'a, K, V, S, A> where
K: Unpin,
impl<'a, K, V, S, A = Global> !UnwindSafe for Entry<'a, K, V, S, A>
Blanket Implementations
impl<T, U> AsBindGroupShaderType<U> for T where
U: ShaderType,
&'a T: for<'a> Into<U>,
impl<T, U> AsBindGroupShaderType<U> for T where
U: ShaderType,
&'a T: for<'a> Into<U>,
fn as_bind_group_shader_type(
&self,
_images: &HashMap<Handle<Image>, <Image as RenderAsset>::PreparedAsset, RandomState, Global>
) -> U
fn as_bind_group_shader_type(
&self,
_images: &HashMap<Handle<Image>, <Image as RenderAsset>::PreparedAsset, RandomState, Global>
) -> U
Return the T
ShaderType
for self
. When used in AsBindGroup
derives, it is safe to assume that all images in self
exist. Read more
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
impl<T> Downcast for T where
T: Any,
impl<T> Downcast for T where
T: Any,
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourcefn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
T: Future, type Output = <T as Future>::Output;
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more