Struct hashbrown::rustc_entry::RustcVacantEntry

pub struct RustcVacantEntry<'a, K, V, A = Global>where
    A: Allocator + Clone,{
    hash: u64,
    key: K,
    table: &'a mut RawTable<(K, V), A>,
}

A view into a vacant entry in a HashMap. It is part of the RustcEntry enum.

Fields

hash: u64

key: K

table: &'a mut RawTable<(K, V), A>

Implementations

impl<'a, K, V, A: Allocator + Clone> RustcVacantEntry<'a, K, V, A>

pub fn key(&self) -> &K

Gets a reference to the key that would be used when inserting a value through the RustcVacantEntry.

Examples

use hashbrown::HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();
assert_eq!(map.rustc_entry("poneyland").key(), &"poneyland");

pub fn into_key(self) -> K

Take ownership of the key.

Examples

use hashbrown::HashMap;
use hashbrown::hash_map::RustcEntry;

let mut map: HashMap<&str, u32> = HashMap::new();

if let RustcEntry::Vacant(v) = map.rustc_entry("poneyland") {
    v.into_key();
}

pub fn insert(self, value: V) -> &'a mut V

Sets the value of the entry with the RustcVacantEntry’s key, and returns a mutable reference to it.

Examples

use hashbrown::HashMap;
use hashbrown::hash_map::RustcEntry;

let mut map: HashMap<&str, u32> = HashMap::new();

if let RustcEntry::Vacant(o) = map.rustc_entry("poneyland") {
    o.insert(37);
}
assert_eq!(map["poneyland"], 37);

pub fn insert_entry(self, value: V) -> RustcOccupiedEntry<'a, K, V, A>

Sets the value of the entry with the RustcVacantEntry’s key, and returns a RustcOccupiedEntry.

Examples

use hashbrown::HashMap;
use hashbrown::hash_map::RustcEntry;

let mut map: HashMap<&str, u32> = HashMap::new();

if let RustcEntry::Vacant(v) = map.rustc_entry("poneyland") {
    let o = v.insert_entry(37);
    assert_eq!(o.get(), &37);
}

Trait Implementations

impl<K: Debug, V, A: Allocator + Clone> Debug for RustcVacantEntry<'_, K, V, A>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.