[][src]Struct actix_web::http::header::VacantEntry

pub struct VacantEntry<'a, T> where
    T: 'a + 'a, 
{ /* fields omitted */ }

A view into a single empty location in a HeaderMap.

This struct is returned as part of the Entry enum.

Methods

impl<'a, T> VacantEntry<'a, T>[src]

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").unwrap().key().as_str(), "x-hello");

pub fn into_key(self) -> HeaderName[src]

Take ownership of the key

Examples

let mut map = HeaderMap::new();

if let Entry::Vacant(v) = map.entry("x-hello").unwrap() {
    assert_eq!(v.into_key().as_str(), "x-hello");
}

pub fn insert(self, value: T) -> &'a mut T[src]

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").unwrap() {
    v.insert("world".parse().unwrap());
}

assert_eq!(map["x-hello"], "world");

pub fn insert_entry(self, value: T) -> OccupiedEntry<'a, T>[src]

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").unwrap() {
    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: 'a + Debug
[src]

Auto Trait Implementations

impl<'a, T> Send for VacantEntry<'a, T> where
    T: Send

impl<'a, T> Sync for VacantEntry<'a, T> where
    T: Sync

Blanket Implementations

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

impl<T> From for T[src]

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

type Error = Infallible

The type returned in the event of a conversion error.

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

impl<T> Any for T where
    T: 'static + ?Sized
[src]

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

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

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

The type returned in the event of a conversion error.

impl<T> Erased for T