Struct reqwest::header::VacantEntry
source · [−]pub struct VacantEntry<'a, T> { /* private fields */ }
Expand description
A view into a single empty location in a HeaderMap
.
This struct is returned as part of the Entry
enum.
Implementations
sourceimpl<'a, T> VacantEntry<'a, T>
impl<'a, T> VacantEntry<'a, T>
sourcepub fn key(&self) -> &HeaderName
pub fn key(&self) -> &HeaderName
Returns a reference to the entry’s key
Examples
let mut map = HeaderMap::new();
assert_eq!(map.entry("x-hello").key().as_str(), "x-hello");
sourcepub fn into_key(self) -> HeaderName
pub fn into_key(self) -> HeaderName
Take ownership of the key
Examples
let mut map = HeaderMap::new();
if let Entry::Vacant(v) = map.entry("x-hello") {
assert_eq!(v.into_key().as_str(), "x-hello");
}
sourcepub fn insert(self, value: T) -> &'a mut T
pub fn insert(self, value: T) -> &'a mut T
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 = HeaderMap::new();
if let Entry::Vacant(v) = map.entry("x-hello") {
v.insert("world".parse().unwrap());
}
assert_eq!(map["x-hello"], "world");
sourcepub fn insert_entry(self, value: T) -> OccupiedEntry<'a, T>
pub fn insert_entry(self, value: T) -> OccupiedEntry<'a, T>
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 = HeaderMap::new();
if let Entry::Vacant(v) = map.entry("x-hello") {
let mut e = v.insert_entry("world".parse().unwrap());
e.insert("world2".parse().unwrap());
}
assert_eq!(map["x-hello"], "world2");
Trait Implementations
Auto Trait Implementations
impl<'a, T> RefUnwindSafe for VacantEntry<'a, T> where
T: RefUnwindSafe,
impl<'a, T> Send for VacantEntry<'a, T> where
T: Send,
impl<'a, T> Sync for VacantEntry<'a, T> where
T: Sync,
impl<'a, T> Unpin for VacantEntry<'a, T>
impl<'a, T> !UnwindSafe for VacantEntry<'a, T>
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
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
sourcefn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more