[−][src]Struct alloc_wg::collections::btree_map::VacantEntry
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>
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pub fn key(&self) -> &K
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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
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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
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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
Auto Trait Implementations
impl<'a, K, V, A> RefUnwindSafe for VacantEntry<'a, K, V, A> where
A: RefUnwindSafe,
K: RefUnwindSafe,
V: RefUnwindSafe,
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,
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,
A: Sync,
K: Sync,
V: Sync,
impl<'a, K, V, A> Unpin for VacantEntry<'a, K, V, A> where
K: Unpin,
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,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,