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Enum tauri::http::header::Entry

x3A;:header::Entry,

pub enum Entry<'a, T> where
    T: 'a,  {
    Occupied(OccupiedEntry<'a, T>),
    Vacant(VacantEntry<'a, T>),
}

Expand description

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>[src]#

pub fn or_insert(self, default: T) -> &'a mutT[src]#

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 mutT where F: FnOnce() -> T,[src]#

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[src]#

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#

impl<'a, T> Debug for Entry<'a, T> where T: 'a + Debug,[src]#

pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>[src]#

Formats the value using the given formatter. Read more

Auto Trait Implementations#

impl<'a, T> RefUnwindSafe for Entry<'a, T> where T: RefUnwindSafe,#

impl<'a, T> Send for Entry<'a, T> where T: Send,#

impl<'a, T> Sync for Entry<'a, T> where 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,[src]#

pub fn type_id(&self) -> TypeId[src]#

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where T: ?Sized,[src]#

pub fn borrow(&self) -> &T[src]#

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where T: ?Sized,[src]#

pub fn borrow_mut(&mut self) -> &mutT[src]#

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]#

pub fn from(t: T) -> T[src]#

Performs the conversion.

impl<T, U> Into<U> for T where U: From<T>,[src]#

pub fn into(self) -> U[src]#

Performs the conversion.

impl<T, U> TryFrom<U> for T where U: Into<T>,[src]#

type Error = Infallible#

The type returned in the event of a conversion error.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]#

Performs the conversion.

impl<T, U> TryInto<U> for T where U: TryFrom<T>,[src]#

type Error = <U as TryFrom<T>>::Error#

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]#

Performs the conversion.

impl<V, T> VZip<V> for T where V: MultiLane<T>,#

pub fn vzip(self) -> V#