pub enum Entry<'a, K, V> {
Occupied(OccupiedEntry<'a, K, V>),
Vacant(VacantEntry<'a, K, V>),
}
Expand description
Entry for an existing key-value pair or a vacant location to insert one.
Variants§
Occupied(OccupiedEntry<'a, K, V>)
Existing slot with equivalent key.
Vacant(VacantEntry<'a, K, V>)
Vacant slot (no equivalent key in the map).
Implementations§
Source§impl<'a, K, V> Entry<'a, K, V>
impl<'a, K, V> Entry<'a, K, V>
Sourcepub fn or_insert(self, default: V) -> &'a mut V
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
use vecmap::VecMap;
let mut map: VecMap<&str, u32> = VecMap::new();
map.entry("poneyland").or_insert(3);
assert_eq!(map["poneyland"], 3);
*map.entry("poneyland").or_insert(10) *= 2;
assert_eq!(map["poneyland"], 6);
Sourcepub fn or_insert_with<F>(self, call: F) -> &'a mut Vwhere
F: FnOnce() -> V,
pub fn or_insert_with<F>(self, call: F) -> &'a mut Vwhere
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
use vecmap::VecMap;
let mut map: VecMap<&str, String> = VecMap::new();
let s = "hoho".to_string();
map.entry("poneyland").or_insert_with(|| s);
assert_eq!(map["poneyland"], "hoho".to_string());
Sourcepub fn or_insert_with_key<F>(self, default: F) -> &'a mut V
pub fn or_insert_with_key<F>(self, default: F) -> &'a mut V
Ensures a value is in the entry by inserting, if empty, the result of the default function.
This method allows for generating key-derived values for insertion by providing the default
function a reference to the key that was moved during the .entry(key)
method call.
The reference to the moved key is provided so that cloning or copying the key is
unnecessary, unlike with .or_insert_with(|| ... )
.
§Examples
use vecmap::VecMap;
let mut map: VecMap<&str, usize> = VecMap::new();
map.entry("poneyland").or_insert_with_key(|key| key.chars().count());
assert_eq!(map["poneyland"], 9);
Sourcepub fn key(&self) -> &K
pub fn key(&self) -> &K
Returns a reference to this entry’s key.
§Examples
use vecmap::VecMap;
let mut map: VecMap<&str, u32> = VecMap::new();
assert_eq!(map.entry("poneyland").key(), &"poneyland");
Sourcepub fn index(&self) -> usize
pub fn index(&self) -> usize
Returns the index where the key-value pair exists or will be inserted.
§Examples
use vecmap::VecMap;
let mut map: VecMap<&str, u32> = VecMap::new();
assert_eq!(map.entry("poneyland").index(), 0);
Sourcepub fn and_modify<F>(self, f: F) -> Self
pub fn and_modify<F>(self, f: F) -> Self
Provides in-place mutable access to an occupied entry before any potential inserts into the map.
§Examples
use vecmap::VecMap;
let mut map: VecMap<&str, u32> = VecMap::new();
map.entry("poneyland")
.and_modify(|e| { *e += 1 })
.or_insert(42);
assert_eq!(map["poneyland"], 42);
map.entry("poneyland")
.and_modify(|e| { *e += 1 })
.or_insert(42);
assert_eq!(map["poneyland"], 43);
Sourcepub fn or_default(self) -> &'a mut Vwhere
V: Default,
pub fn or_default(self) -> &'a mut Vwhere
V: Default,
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
use vecmap::VecMap;
let mut map: VecMap<&str, Option<u32>> = VecMap::new();
map.entry("poneyland").or_default();
assert_eq!(map["poneyland"], None);