[][src]Struct alloc_wg::collections::btree_map::VacantEntry

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

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

Implementations

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

pub fn key(&self) -> &K[src]

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

Examples

use std::collections::BTreeMap;

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

pub fn into_key(self) -> K[src]

Take ownership of the key.

Examples

use std::collections::{btree_map::Entry, BTreeMap};

let mut map: BTreeMap<&str, usize> = BTreeMap::new();

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

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::{btree_map::Entry, BTreeMap};

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

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

Trait Implementations

impl<K: Debug + Ord, V, A: AllocRef, '_> Debug for VacantEntry<'_, K, V, A>[src]

Auto Trait Implementations

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

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

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

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

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

Blanket Implementations

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

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

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

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

impl<T, U> Into<U> for T where
    U: From<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> 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.