1.0.0[−][src]Struct std::collections::btree_map::VacantEntry

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

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

Implementations

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

pub fn key(&self) -> &Kⓘ

Notable traits for &'_ mut I

impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized,  type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W
1.10.0[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");
Run

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

Take ownership of the key.

Examples

use std::collections::BTreeMap;
use std::collections::btree_map::Entry;

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

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

pub fn insert(self, value: V) -> &'a mut Vⓘ

Notable traits for &'_ mut I

impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized,  type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W
[src]

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

Examples

use std::collections::BTreeMap;
use std::collections::btree_map::Entry;

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

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

Trait Implementations

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

Auto Trait Implementations

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

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

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

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

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

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.