1.0.0[][src]Struct std::collections::btree_map::OccupiedEntry

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

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]

Important traits for &'_ mut F
pub fn key(&self) -> &K1.10.0[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 F
pub 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 F
pub 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 F
pub 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

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

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

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

impl<'a, K, V> Sync for OccupiedEntry<'a, K, V> where
    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]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

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.

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]