[−][src]Struct reqwest::header::VacantEntry
A view into a single empty location in a HeaderMap
.
This struct is returned as part of the Entry
enum.
Implementations
impl<'a, T> VacantEntry<'a, T>
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pub fn key(&self) -> &HeaderName
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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");
pub fn into_key(self) -> HeaderName
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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"); }
pub fn insert(self, value: T) -> &'a mut T
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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");
pub fn insert_entry(self, value: T) -> OccupiedEntry<'a, T>
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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
impl<'a, T> Debug for VacantEntry<'a, T> where
T: Debug,
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T: Debug,
Auto Trait Implementations
impl<'a, T> RefUnwindSafe for VacantEntry<'a, T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<'a, T> Send for VacantEntry<'a, T> where
T: Send,
T: Send,
impl<'a, T> Sync for VacantEntry<'a, T> where
T: Sync,
T: Sync,
impl<'a, T> Unpin for VacantEntry<'a, T>
impl<'a, T> !UnwindSafe for VacantEntry<'a, T>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,