pub struct VacantEntry<'a, T>where
T: 'a,{ /* private fields */ }
Expand description
A view into a single empty location in a HeaderMap
.
This struct is returned as part of the Entry
enum.
Implementations§
source§impl<'a, T> VacantEntry<'a, T>
impl<'a, T> VacantEntry<'a, T>
sourcepub fn key(&self) -> &HeaderName
pub fn key(&self) -> &HeaderName
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");
sourcepub fn into_key(self) -> HeaderName
pub fn into_key(self) -> HeaderName
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");
}
sourcepub fn insert(self, value: T) -> &'a mut T
pub fn insert(self, value: T) -> &'a mut T
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");
sourcepub fn insert_entry(self, value: T) -> OccupiedEntry<'a, T>
pub fn insert_entry(self, value: T) -> OccupiedEntry<'a, T>
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§
Auto Trait Implementations§
impl<'a, T> RefUnwindSafe for VacantEntry<'a, T>where
T: RefUnwindSafe,
impl<'a, T> Send for VacantEntry<'a, T>where
T: Send,
impl<'a, T> Sync for VacantEntry<'a, T>where
T: Sync,
impl<'a, T> Unpin for VacantEntry<'a, T>
impl<'a, T> !UnwindSafe for VacantEntry<'a, T>
Blanket Implementations§
source§impl<T> IntoSql for T
impl<T> IntoSql for T
source§fn into_sql<T>(self) -> Self::Expressionwhere
Self: AsExpression<T> + Sized,
fn into_sql<T>(self) -> Self::Expressionwhere
Self: AsExpression<T> + Sized,
Convert
self
to an expression for Diesel’s query builder. Read moresource§fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expressionwhere
&'a Self: AsExpression<T>,
fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expressionwhere
&'a Self: AsExpression<T>,
Convert
&self
to an expression for Diesel’s query builder. Read more