1.0.0[][src]Enum std::collections::hash_map::Entry

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

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

This enum is constructed from the entry method on HashMap.

Variants

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

An occupied entry.

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

A vacant entry.

Methods

impl<'a, K, V> Entry<'a, K, V>[src]

Important traits for &'_ mut F
pub fn or_insert(self, default: V) -> &'a mut V[src]

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 std::collections::HashMap;

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

map.entry("poneyland").or_insert(3);
assert_eq!(map["poneyland"], 3);

*map.entry("poneyland").or_insert(10) *= 2;
assert_eq!(map["poneyland"], 6);Run

Important traits for &'_ mut F
pub fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut V[src]

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 std::collections::HashMap;

let mut map: HashMap<&str, String> = HashMap::new();
let s = "hoho".to_string();

map.entry("poneyland").or_insert_with(|| s);

assert_eq!(map["poneyland"], "hoho".to_string());Run

Important traits for &'_ mut F
pub fn key(&self) -> &K1.10.0[src]

Returns a reference to this entry's key.

Examples

use std::collections::HashMap;

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

pub fn and_modify<F>(self, f: F) -> Self where
    F: FnOnce(&mut V), 
1.26.0[src]

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

Examples

use std::collections::HashMap;

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

pub fn insert(self, value: V) -> OccupiedEntry<'a, K, V>[src]

🔬 This is a nightly-only experimental API. (entry_insert #65225)

Sets the value of the entry, and returns an OccupiedEntry.

Examples

#![feature(entry_insert)]
use std::collections::HashMap;

let mut map: HashMap<&str, String> = HashMap::new();
let entry = map.entry("poneyland").insert("hoho".to_string());

assert_eq!(entry.key(), &"poneyland");Run

impl<'a, K, V: Default> Entry<'a, K, V>[src]

Important traits for &'_ mut F
pub fn or_default(self) -> &'a mut V1.28.0[src]

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 std::collections::HashMap;

let mut map: HashMap<&str, Option<u32>> = HashMap::new();
map.entry("poneyland").or_default();

assert_eq!(map["poneyland"], None);Run

Trait Implementations

impl<'_, K: Debug, V: Debug> Debug for Entry<'_, K, V>1.12.0[src]

Auto Trait Implementations

impl<'a, K, V> !UnwindSafe for Entry<'a, K, V>

impl<'a, K, V> RefUnwindSafe for Entry<'a, K, V> where
    K: RefUnwindSafe,
    V: RefUnwindSafe

impl<'a, K, V> Unpin for Entry<'a, K, V> where
    K: Unpin

impl<'a, K, V> Send for Entry<'a, K, V> where
    K: Send,
    V: Send

impl<'a, K, V> Sync for Entry<'a, K, V> where
    K: Sync,
    V: Sync

Blanket Implementations

impl<T> From<T> for T[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]