[−][src]Enum reqwest::header::Entry
A view into a single location in a HeaderMap
, which may be vacant or occupied.
Variants
Occupied(OccupiedEntry<'a, T>)
An occupied entry
Vacant(VacantEntry<'a, T>)
A vacant entry
Implementations
impl<'a, T> Entry<'a, T>
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pub fn or_insert(self, default: T) -> &'a mut T
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Ensures a value is in the entry by inserting the default if empty.
Returns a mutable reference to the first value in the entry.
Examples
let mut map: HeaderMap<u32> = HeaderMap::default(); let headers = &[ "content-length", "x-hello", "Content-Length", "x-world", ]; for &header in headers { let counter = map.entry(header) .or_insert(0); *counter += 1; } assert_eq!(map["content-length"], 2); assert_eq!(map["x-hello"], 1);
pub fn or_insert_with<F>(self, default: F) -> &'a mut T where
F: FnOnce() -> T,
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F: FnOnce() -> T,
Ensures a value is in the entry by inserting the result of the default function if empty.
The default function is not called if the entry exists in the map. Returns a mutable reference to the first value in the entry.
Examples
Basic usage.
let mut map = HeaderMap::new(); let res = map.entry("x-hello") .or_insert_with(|| "world".parse().unwrap()); assert_eq!(res, "world");
The default function is not called if the entry exists in the map.
let mut map = HeaderMap::new(); map.insert(HOST, "world".parse().unwrap()); let res = map.entry("host") .or_insert_with(|| unreachable!()); assert_eq!(res, "world");
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(), "x-hello");
Trait Implementations
Auto Trait Implementations
impl<'a, T> RefUnwindSafe for Entry<'a, T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<'a, T> Send for Entry<'a, T> where
T: Send,
T: Send,
impl<'a, T> Sync for Entry<'a, T> where
T: Sync,
T: Sync,
impl<'a, T> Unpin for Entry<'a, T>
impl<'a, T> !UnwindSafe for Entry<'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>,