Struct tonic::metadata::VacantEntry
source · pub struct VacantEntry<'a, VE: ValueEncoding> { /* private fields */ }
Expand description
A view into a single empty location in a MetadataMap
.
This struct is returned as part of the Entry
enum.
Implementations§
source§impl<'a, VE: ValueEncoding> VacantEntry<'a, VE>
impl<'a, VE: ValueEncoding> VacantEntry<'a, VE>
sourcepub fn key(&self) -> &MetadataKey<VE>
pub fn key(&self) -> &MetadataKey<VE>
Returns a reference to the entry’s key
§Examples
let mut map = MetadataMap::new();
assert_eq!(map.entry("x-hello").unwrap().key(), "x-hello");
sourcepub fn into_key(self) -> MetadataKey<VE>
pub fn into_key(self) -> MetadataKey<VE>
Take ownership of the key
§Examples
let mut map = MetadataMap::new();
if let Entry::Vacant(v) = map.entry("x-hello").unwrap() {
assert_eq!(v.into_key().as_str(), "x-hello");
}
sourcepub fn insert(self, value: MetadataValue<VE>) -> &'a mut MetadataValue<VE>
pub fn insert(self, value: MetadataValue<VE>) -> &'a mut MetadataValue<VE>
Insert the value into the entry.
The value will be associated with this entry’s key. A mutable reference to the inserted value will be returned.
§Examples
let mut map = MetadataMap::new();
if let Entry::Vacant(v) = map.entry("x-hello").unwrap() {
v.insert("world".parse().unwrap());
}
assert_eq!(map.get("x-hello").unwrap(), "world");
sourcepub fn insert_entry(self, value: MetadataValue<VE>) -> OccupiedEntry<'a, Ascii>
pub fn insert_entry(self, value: MetadataValue<VE>) -> OccupiedEntry<'a, Ascii>
Insert the value into the entry.
The value will be associated with this entry’s key. The new
OccupiedEntry
is returned, allowing for further manipulation.
§Examples
let mut map = MetadataMap::new();
if let Entry::Vacant(v) = map.entry("x-hello").unwrap() {
let mut e = v.insert_entry("world".parse().unwrap());
e.insert("world2".parse().unwrap());
}
assert_eq!(map.get("x-hello").unwrap(), "world2");
Trait Implementations§
Auto Trait Implementations§
impl<'a, VE> !Freeze for VacantEntry<'a, VE>
impl<'a, VE> RefUnwindSafe for VacantEntry<'a, VE>where
VE: RefUnwindSafe,
impl<'a, VE> Send for VacantEntry<'a, VE>where
VE: Send,
impl<'a, VE> Sync for VacantEntry<'a, VE>where
VE: Sync,
impl<'a, VE> Unpin for VacantEntry<'a, VE>where
VE: Unpin,
impl<'a, VE> !UnwindSafe for VacantEntry<'a, VE>
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
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
source§fn in_current_span(self) -> Instrumented<Self> ⓘ
fn in_current_span(self) -> Instrumented<Self> ⓘ
source§impl<T> IntoRequest<T> for T
impl<T> IntoRequest<T> for T
source§fn into_request(self) -> Request<T>
fn into_request(self) -> Request<T>
Wrap the input message
T
in a tonic::Request