1.0.0[−][src]Struct boolean_enums::lstd::collections::btree_map::VacantEntry
A view into a vacant entry in a BTreeMap
.
It is part of the Entry
enum.
Methods
impl<'a, K, V> VacantEntry<'a, K, V> where
K: Ord,
[src]
impl<'a, K, V> VacantEntry<'a, K, V> where
K: Ord,
ⓘImportant traits for &'a mut W
ⓘImportant traits for &'a mut W
pub fn key(&self) -> &K | 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");
pub fn into_key(self) -> K | 1.12.0 [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(); }
ⓘImportant traits for &'a mut W
ⓘImportant traits for &'a mut W
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::BTreeMap; let mut count: BTreeMap<&str, usize> = BTreeMap::new(); // count the number of occurrences of letters in the vec for x in vec!["a","b","a","c","a","b"] { *count.entry(x).or_insert(0) += 1; } assert_eq!(count["a"], 3);
Trait Implementations
impl<'a, K, V> Debug for VacantEntry<'a, K, V> where
K: 'a + Ord + Debug,
V: 'a,
1.12.0[src]
impl<'a, K, V> Debug for VacantEntry<'a, K, V> where
K: 'a + Ord + Debug,
V: 'a,
1.12.0
[src]Auto Trait Implementations
impl<'a, K, V> Send for VacantEntry<'a, K, V> where
K: Send,
V: Send,
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,
impl<'a, K, V> Sync for VacantEntry<'a, K, V> where
K: Sync,
V: Sync,
Blanket Implementations
impl<T, U> Into for T where
U: From<T>,
[src]
impl<T, U> Into for T where
U: From<T>,
impl<T> From for T
[src]
impl<T> From for T
impl<T, U> TryFrom for T where
T: From<U>,
[src]
impl<T, U> TryFrom for T where
T: From<U>,
type Error = !
🔬 This is a nightly-only experimental API. (
try_from
)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error> | [src] |
impl<T> Borrow for T where
T: ?Sized,
[src]
impl<T> Borrow for T where
T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
[src]
impl<T> Any for T where
T: 'static + ?Sized,
fn get_type_id(&self) -> TypeId | [src] |
impl<T, U> TryInto for T where
U: TryFrom<T>,
[src]
impl<T, U> TryInto for T where
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
🔬 This is a nightly-only experimental API. (
try_from
)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error> | [src] |
impl<T> BorrowMut for T where
T: ?Sized,
[src]
impl<T> BorrowMut for T where
T: ?Sized,
ⓘImportant traits for &'a mut W
ⓘImportant traits for &'a mut W
fn borrow_mut(&mut self) -> &mut T | [src] |