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

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>
[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");

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");
}

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");

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 + 'a> Debug for VacantEntry<'a, T>
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Formats the value using the given formatter. Read more

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