Struct std::collections::hash_map::OccupiedEntry1.0.0 [] [src]

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

A view into an occupied entry in a HashMap. It is part of the Entry enum.

Methods

impl<'a, K, V> OccupiedEntry<'a, K, V>
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1.10.0
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Gets a reference to the key in the entry.

Examples

use std::collections::HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();
map.entry("poneyland").or_insert(12);
assert_eq!(map.entry("poneyland").key(), &"poneyland");Run

1.12.0
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Take the ownership of the key and value from the map.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::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();
}

assert_eq!(map.contains_key("poneyland"), false);Run

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Gets a reference to the value in the entry.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::new();
map.entry("poneyland").or_insert(12);

if let Entry::Occupied(o) = map.entry("poneyland") {
    assert_eq!(o.get(), &12);
}Run

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Gets a mutable reference to the value in the entry.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::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!(map["poneyland"], 22);Run

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Converts the OccupiedEntry into a mutable reference to the value in the entry with a lifetime bound to the map itself.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::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

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Sets the value of the entry, and returns the entry's old value.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::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

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Takes the value out of the entry, and returns it.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::new();
map.entry("poneyland").or_insert(12);

if let Entry::Occupied(o) = map.entry("poneyland") {
    assert_eq!(o.remove(), 12);
}

assert_eq!(map.contains_key("poneyland"), false);Run

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🔬 This is a nightly-only experimental API. (map_entry_replace #44286)

Replaces the entry, returning the old key and value.

Examples

#![feature(map_entry_replace)]
use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<String, u32> = HashMap::new();
map.insert("poneyland".to_string(), 15);

if let Entry::Occupied(entry) = map.entry("poneyland".to_string()) {
    let (old_key, old_value): (String, u32) = entry.replace(16);
    assert_eq!(old_key, "poneyland");
    assert_eq!(old_value, 15);
}

assert_eq!(map.get("poneyland"), Some(&16));Run

Trait Implementations

impl<'a, K: 'a + Debug, V: 'a + Debug> Debug for OccupiedEntry<'a, K, V>
1.12.0
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Formats the value using the given formatter.