Enum Entry 

pub enum Entry<'a, K, V>
where
    K: Key,
{
    Occupied(OccupiedEntry<'a, K, V>),
    Vacant(VacantEntry<'a, K, V>),
}

A view into a single entry in a SparseSecondaryMap, which may either be vacant or occupied.

This enum is constructed using SparseSecondaryMap::entry.

Variants

Occupied(OccupiedEntry<'a, K, V>)

An occupied entry.

Vacant(VacantEntry<'a, K, V>)

A vacant entry.

Implementations

impl<'a, K, V> Entry<'a, K, V>

where K: Key,

pub fn or_insert(self, default: V) -> &'a mut V

Ensures a value is in the entry by inserting the default if empty, and returns a mutable reference to the value in the entry.

Examples

let mut sm = SlotMap::new();
let mut sec = SparseSecondaryMap::new();

let k = sm.insert("poneyland");
let v = sec.entry(k).unwrap().or_insert(10);
assert_eq!(*v, 10);
*sec.entry(k).unwrap().or_insert(1) *= 2;
assert_eq!(sec[k], 20);

pub fn or_insert_with<F>(self, default: F) -> &'a mut V

where F: FnOnce() -> V,

Ensures a value is in the entry by inserting the result of the default function if empty, and returns a mutable reference to the value in the entry.

Examples

let mut sm = SlotMap::new();
let mut sec = SparseSecondaryMap::new();

let k = sm.insert(1);
let v = sec.entry(k).unwrap().or_insert_with(|| "foobar".to_string());
assert_eq!(v, &"foobar");

pub fn key(&self) -> K

Returns this entry’s key.

Examples

let mut sm = SlotMap::new();
let mut sec: SparseSecondaryMap<_, ()> = SparseSecondaryMap::new();

let k = sm.insert(1);
let entry = sec.entry(k).unwrap();
assert_eq!(entry.key(), k);

pub fn and_modify<F>(self, f: F) -> Entry<'a, K, V>

where F: FnOnce(&mut V),

Provides in-place mutable access to an occupied entry before any potential inserts into the map.

Examples

let mut sm = SlotMap::new();
let mut sec = SparseSecondaryMap::new();

let k = sm.insert(1);
sec.insert(k, 0);
sec.entry(k).unwrap().and_modify(|x| *x = 1);

assert_eq!(sec[k], 1)

impl<'a, K, V> Entry<'a, K, V>

where K: Key, V: Default,

pub fn or_default(self) -> &'a mut V

Ensures a value is in the entry by inserting the default value if empty, and returns a mutable reference to the value in the entry.

Examples

let mut sm = SlotMap::new();
let mut sec: SparseSecondaryMap<_, Option<i32>> = SparseSecondaryMap::new();

let k = sm.insert(1);
sec.entry(k).unwrap().or_default();
assert_eq!(sec[k], None)

Trait Implementations

impl<'a, K, V> Debug for Entry<'a, K, V>

where K: Debug + Key, V: Debug,

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

Formats the value using the given formatter.

impl<'e, K, V> EntryExt<'e, K, V> for Entry<'e, K, V>

where K: Key,

fn insert(self, v: V)

fn remove(self) -> (K, Option<V>)