1.0.0[][src]Struct std::collections::hash_map::VacantEntry

pub struct VacantEntry<'a, K: 'a, V: 'a> { /* fields omitted */ }

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

Methods

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

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

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

Examples

use std::collections::HashMap;

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

pub fn into_key(self) -> K1.12.0[src]

Take ownership of the key.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

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

if let Entry::Vacant(v) = map.entry("poneyland") {
    v.into_key();
}Run

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

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

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

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

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

Trait Implementations

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

Auto Trait Implementations

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

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

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

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

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

Blanket Implementations

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> From<T> for 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]