Struct std::collections::btree_map::OccupiedEntry
1.0.0 · source · pub struct OccupiedEntry<'a, K, V, A = Global>{ /* private fields */ }
Expand description
A view into an occupied entry in a BTreeMap
.
It is part of the Entry
enum.
Implementations§
source§impl<'a, K, V, A> OccupiedEntry<'a, K, V, A>
impl<'a, K, V, A> OccupiedEntry<'a, K, V, A>
1.12.0 · sourcepub fn remove_entry(self) -> (K, V)
pub fn remove_entry(self) -> (K, V)
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"]);
Runsourcepub fn get(&self) -> &V
pub fn get(&self) -> &V
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);
}
Runsourcepub fn get_mut(&mut self) -> &mut V
pub fn get_mut(&mut self) -> &mut V
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);
Runsourcepub fn into_mut(self) -> &'a mut V
pub fn into_mut(self) -> &'a mut V
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);
Runsourcepub fn insert(&mut self, value: V) -> V
pub fn insert(&mut self, value: V) -> V
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);
Runsourcepub fn remove(self) -> V
pub fn remove(self) -> V
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"]);
RunTrait Implementations§
Auto Trait Implementations§
impl<'a, K, V, A> RefUnwindSafe for OccupiedEntry<'a, K, V, A>
impl<'a, K, V, A> Send for OccupiedEntry<'a, K, V, A>
impl<'a, K, V, A> Sync for OccupiedEntry<'a, K, V, A>
impl<'a, K, V, A> Unpin for OccupiedEntry<'a, K, V, A>where
A: Unpin,
impl<'a, K, V, A = Global> !UnwindSafe for OccupiedEntry<'a, K, V, A>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more