Struct http::header::VacantEntry
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pub struct VacantEntry<'a, T: '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>
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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").unwrap().key().as_str(), "x-hello");
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").unwrap() { assert_eq!(v.into_key().as_str(), "x-hello"); }
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").unwrap() { v.insert("world".parse().unwrap()); } assert_eq!(map["x-hello"], "world");
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").unwrap() { let mut e = v.insert_entry("world".parse().unwrap()); e.insert("world2".parse().unwrap()); } assert_eq!(map["x-hello"], "world2");