pub struct OccupiedEntry<'a, T> {
    map: &'a mut HeaderMap<T>,
    probe: usize,
    index: usize,
}
Expand description

A view into a single occupied location in a HeaderMap.

This struct is returned as part of the Entry enum.

Fields

map: &'a mut HeaderMap<T>probe: usizeindex: usize

Implementations

Returns a reference to the entry’s key.

Examples
let mut map = HeaderMap::new();
map.insert(HOST, "world".parse().unwrap());

if let Entry::Occupied(e) = map.entry("host") {
    assert_eq!("host", e.key());
}

Get a reference to the first value in the entry.

Values are stored in insertion order.

Panics

get panics if there are no values associated with the entry.

Examples
let mut map = HeaderMap::new();
map.insert(HOST, "hello.world".parse().unwrap());

if let Entry::Occupied(mut e) = map.entry("host") {
    assert_eq!(e.get(), &"hello.world");

    e.append("hello.earth".parse().unwrap());

    assert_eq!(e.get(), &"hello.world");
}

Get a mutable reference to the first value in the entry.

Values are stored in insertion order.

Panics

get_mut panics if there are no values associated with the entry.

Examples
let mut map = HeaderMap::default();
map.insert(HOST, "hello.world".to_string());

if let Entry::Occupied(mut e) = map.entry("host") {
    e.get_mut().push_str("-2");
    assert_eq!(e.get(), &"hello.world-2");
}

Converts the OccupiedEntry into a mutable reference to the first value.

The lifetime of the returned reference is bound to the original map.

Panics

into_mut panics if there are no values associated with the entry.

Examples
let mut map = HeaderMap::default();
map.insert(HOST, "hello.world".to_string());
map.append(HOST, "hello.earth".to_string());

if let Entry::Occupied(e) = map.entry("host") {
    e.into_mut().push_str("-2");
}

assert_eq!("hello.world-2", map["host"]);

Sets the value of the entry.

All previous values associated with the entry are removed and the first one is returned. See insert_mult for an API that returns all values.

Examples
let mut map = HeaderMap::new();
map.insert(HOST, "hello.world".parse().unwrap());

if let Entry::Occupied(mut e) = map.entry("host") {
    let mut prev = e.insert("earth".parse().unwrap());
    assert_eq!("hello.world", prev);
}

assert_eq!("earth", map["host"]);

Sets the value of the entry.

This function does the same as insert except it returns an iterator that yields all values previously associated with the key.

Examples
let mut map = HeaderMap::new();
map.insert(HOST, "world".parse().unwrap());
map.append(HOST, "world2".parse().unwrap());

if let Entry::Occupied(mut e) = map.entry("host") {
    let mut prev = e.insert_mult("earth".parse().unwrap());
    assert_eq!("world", prev.next().unwrap());
    assert_eq!("world2", prev.next().unwrap());
    assert!(prev.next().is_none());
}

assert_eq!("earth", map["host"]);

Insert the value into the entry.

The new value is appended to the end of the entry’s value list. All previous values associated with the entry are retained.

Examples
let mut map = HeaderMap::new();
map.insert(HOST, "world".parse().unwrap());

if let Entry::Occupied(mut e) = map.entry("host") {
    e.append("earth".parse().unwrap());
}

let values = map.get_all("host");
let mut i = values.iter();
assert_eq!("world", *i.next().unwrap());
assert_eq!("earth", *i.next().unwrap());

Remove the entry from the map.

All values associated with the entry are removed and the first one is returned. See remove_entry_mult for an API that returns all values.

Examples
let mut map = HeaderMap::new();
map.insert(HOST, "world".parse().unwrap());

if let Entry::Occupied(e) = map.entry("host") {
    let mut prev = e.remove();
    assert_eq!("world", prev);
}

assert!(!map.contains_key("host"));
source

pub fn remove_entry(self) -> (HeaderName, T)

Remove the entry from the map.

The key and all values associated with the entry are removed and the first one is returned. See remove_entry_mult for an API that returns all values.

Examples
let mut map = HeaderMap::new();
map.insert(HOST, "world".parse().unwrap());

if let Entry::Occupied(e) = map.entry("host") {
    let (key, mut prev) = e.remove_entry();
    assert_eq!("host", key.as_str());
    assert_eq!("world", prev);
}

assert!(!map.contains_key("host"));
source

pub fn remove_entry_mult(self) -> (HeaderName, ValueDrain<'a, T>)

Remove the entry from the map.

The key and all values associated with the entry are removed and returned.

Returns an iterator visiting all values associated with the entry.

Values are iterated in insertion order.

Examples
let mut map = HeaderMap::new();
map.insert(HOST, "world".parse().unwrap());
map.append(HOST, "earth".parse().unwrap());

if let Entry::Occupied(e) = map.entry("host") {
    let mut iter = e.iter();
    assert_eq!(&"world", iter.next().unwrap());
    assert_eq!(&"earth", iter.next().unwrap());
    assert!(iter.next().is_none());
}

Returns an iterator mutably visiting all values associated with the entry.

Values are iterated in insertion order.

Examples
let mut map = HeaderMap::default();
map.insert(HOST, "world".to_string());
map.append(HOST, "earth".to_string());

if let Entry::Occupied(mut e) = map.entry("host") {
    for e in e.iter_mut() {
        e.push_str("-boop");
    }
}

let mut values = map.get_all("host");
let mut i = values.iter();
assert_eq!(&"world-boop", i.next().unwrap());
assert_eq!(&"earth-boop", i.next().unwrap());

Trait Implementations

Formats the value using the given formatter. Read more

The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Creates an iterator from a value. Read more

The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Creates an iterator from a value. Read more

The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Creates an iterator from a value. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more