pub struct VacantEntryRef<'a, 'b, K, Q, V, S, A = Global> where
A: Allocator + Clone,
Q: ?Sized, { /* private fields */ }
Expand description
A view into a vacant entry in a HashMap
.
It is part of the EntryRef
enum.
Implementations
impl<'a, 'b, K, Q, V, S, A> VacantEntryRef<'a, 'b, K, Q, V, S, A> where
A: Allocator + Clone,
Q: ?Sized,
impl<'a, 'b, K, Q, V, S, A> VacantEntryRef<'a, 'b, K, Q, V, S, A> where
A: Allocator + Clone,
Q: ?Sized,
pub fn key(&self) -> &Q where
K: Borrow<Q>,
pub fn key(&self) -> &Q where
K: Borrow<Q>,
Gets a reference to the key that would be used when inserting a value
through the VacantEntryRef
.
Examples
use hashbrown::HashMap;
let mut map: HashMap<String, u32> = HashMap::new();
let key: &str = "poneyland";
assert_eq!(map.entry_ref(key).key(), "poneyland");
pub fn into_key(self) -> K where
K: From<&'b Q>,
pub fn into_key(self) -> K where
K: From<&'b Q>,
Take ownership of the key.
Examples
use hashbrown::HashMap;
use hashbrown::hash_map::EntryRef;
let mut map: HashMap<String, u32> = HashMap::new();
let key: &str = "poneyland";
if let EntryRef::Vacant(v) = map.entry_ref(key) {
v.into_key();
}
pub fn insert(self, value: V) -> &'a mut V where
K: Hash + From<&'b Q>,
S: BuildHasher,
pub fn insert(self, value: V) -> &'a mut V where
K: Hash + From<&'b Q>,
S: BuildHasher,
Sets the value of the entry with the VacantEntryRef’s key, and returns a mutable reference to it.
Examples
use hashbrown::HashMap;
use hashbrown::hash_map::EntryRef;
let mut map: HashMap<String, u32> = HashMap::new();
let key: &str = "poneyland";
if let EntryRef::Vacant(o) = map.entry_ref(key) {
o.insert(37);
}
assert_eq!(map["poneyland"], 37);
Trait Implementations
Auto Trait Implementations
impl<'a, 'b, K, Q: ?Sized, V, S, A> RefUnwindSafe for VacantEntryRef<'a, 'b, K, Q, V, S, A> where
A: RefUnwindSafe,
K: RefUnwindSafe,
Q: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
impl<'a, 'b, K, Q: ?Sized, V, S, A> Send for VacantEntryRef<'a, 'b, K, Q, V, S, A> where
A: Send,
K: Send,
Q: Sync,
S: Send,
V: Send,
impl<'a, 'b, K, Q: ?Sized, V, S, A> Sync for VacantEntryRef<'a, 'b, K, Q, V, S, A> where
A: Sync,
K: Sync,
Q: Sync,
S: Sync,
V: Sync,
impl<'a, 'b, K, Q: ?Sized, V, S, A> Unpin for VacantEntryRef<'a, 'b, K, Q, V, S, A> where
K: Unpin,
impl<'a, 'b, K, Q, V, S, A = Global> !UnwindSafe for VacantEntryRef<'a, 'b, K, Q, 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