1.0.0[−][src]Struct std::collections::btree_map::OccupiedEntry
A view into an occupied entry in a BTreeMap
.
It is part of the Entry
enum.
Methods
impl<'a, K, V> OccupiedEntry<'a, K, V> where
K: Ord,
[src]
K: Ord,
ⓘImportant traits for &'_ mut Fpub fn key(&self) -> &K
1.10.0[src]
Gets a reference to the key in the entry.
Examples
use std::collections::BTreeMap; let mut map: BTreeMap<&str, usize> = BTreeMap::new(); map.entry("poneyland").or_insert(12); assert_eq!(map.entry("poneyland").key(), &"poneyland");Run
pub fn remove_entry(self) -> (K, V)
1.12.0[src]
Take ownership of the key and value from the map.
Examples
use std::collections::BTreeMap; use std::collections::btree_map::Entry; let mut map: BTreeMap<&str, usize> = BTreeMap::new(); map.entry("poneyland").or_insert(12); if let Entry::Occupied(o) = map.entry("poneyland") { // We delete the entry from the map. o.remove_entry(); } // If now try to get the value, it will panic: // println!("{}", map["poneyland"]);Run
ⓘImportant traits for &'_ mut Fpub fn get(&self) -> &V
[src]
Gets a reference to the value in the entry.
Examples
use std::collections::BTreeMap; use std::collections::btree_map::Entry; let mut map: BTreeMap<&str, usize> = BTreeMap::new(); map.entry("poneyland").or_insert(12); if let Entry::Occupied(o) = map.entry("poneyland") { assert_eq!(o.get(), &12); }Run
ⓘImportant traits for &'_ mut Fpub fn get_mut(&mut self) -> &mut V
[src]
Gets a mutable reference to the value in the entry.
If you need a reference to the OccupiedEntry
that may outlive the
destruction of the Entry
value, see into_mut
.
Examples
use std::collections::BTreeMap; use std::collections::btree_map::Entry; let mut map: BTreeMap<&str, usize> = BTreeMap::new(); map.entry("poneyland").or_insert(12); assert_eq!(map["poneyland"], 12); if let Entry::Occupied(mut o) = map.entry("poneyland") { *o.get_mut() += 10; assert_eq!(*o.get(), 22); // We can use the same Entry multiple times. *o.get_mut() += 2; } assert_eq!(map["poneyland"], 24);Run
ⓘImportant traits for &'_ mut Fpub fn into_mut(self) -> &'a mut V
[src]
Converts the entry into a mutable reference to its value.
If you need multiple references to the OccupiedEntry
, see get_mut
.
Examples
use std::collections::BTreeMap; use std::collections::btree_map::Entry; let mut map: BTreeMap<&str, usize> = BTreeMap::new(); map.entry("poneyland").or_insert(12); assert_eq!(map["poneyland"], 12); if let Entry::Occupied(o) = map.entry("poneyland") { *o.into_mut() += 10; } assert_eq!(map["poneyland"], 22);Run
pub fn insert(&mut self, value: V) -> V
[src]
Sets the value of the entry with the OccupiedEntry
's key,
and returns the entry's old value.
Examples
use std::collections::BTreeMap; use std::collections::btree_map::Entry; let mut map: BTreeMap<&str, usize> = BTreeMap::new(); map.entry("poneyland").or_insert(12); if let Entry::Occupied(mut o) = map.entry("poneyland") { assert_eq!(o.insert(15), 12); } assert_eq!(map["poneyland"], 15);Run
pub fn remove(self) -> V
[src]
Takes the value of the entry out of the map, and returns it.
Examples
use std::collections::BTreeMap; use std::collections::btree_map::Entry; let mut map: BTreeMap<&str, usize> = BTreeMap::new(); map.entry("poneyland").or_insert(12); if let Entry::Occupied(o) = map.entry("poneyland") { assert_eq!(o.remove(), 12); } // If we try to get "poneyland"'s value, it'll panic: // println!("{}", map["poneyland"]);Run
Trait Implementations
Auto Trait Implementations
impl<'a, K, V> !UnwindSafe for OccupiedEntry<'a, K, V>
impl<'a, K, V> RefUnwindSafe for OccupiedEntry<'a, K, V> where
K: RefUnwindSafe,
V: RefUnwindSafe,
K: RefUnwindSafe,
V: RefUnwindSafe,
impl<'a, K, V> Unpin for OccupiedEntry<'a, K, V>
impl<'a, K, V> Send for OccupiedEntry<'a, K, V> where
K: Send,
V: Send,
K: Send,
V: Send,
impl<'a, K, V> Sync for OccupiedEntry<'a, K, V> where
K: Sync,
V: Sync,
K: Sync,
V: Sync,
Blanket Implementations
impl<T> From<T> for T
[src]
impl<T, U> TryFrom<U> for T where
U: Into<T>,
[src]
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>
[src]
impl<T, U> Into<U> for T where
U: From<T>,
[src]
U: From<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
[src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
[src]
impl<T> Borrow<T> for T where
T: ?Sized,
[src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]
T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T
[src]
impl<T> Any for T where
T: 'static + ?Sized,
[src]
T: 'static + ?Sized,