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.
impl<'a, K, V> OccupiedEntry<'a, K, V> where
K: Ord,
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fn key(&self) -> &K
Gets a reference to the key in the entry.
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"); fn remove_entry(self) -> (K, V)
Take ownership of the key and value from the map.
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"]); fn get(&self) -> &V
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Gets a reference to the value in the entry.
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);
} fn get_mut(&mut self) -> &mut V
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Gets a mutable reference to the value in the entry.
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!(map["poneyland"], 22); fn into_mut(self) -> &'a mut V
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Converts the entry into a mutable reference to its value.
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); fn insert(&mut self, value: V) -> V
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Sets the value of the entry with the OccupiedEntry's key, and returns the entry's old value.
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); fn remove(self) -> V
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Takes the value of the entry out of the map, and returns it.
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"]); impl<'a, K, V> Debug for OccupiedEntry<'a, K, V> where
K: 'a + Ord + Debug,
V: 'a + Debug,
fn fmt(&self, f: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html