pub enum Entry<'a, K: 'a, V: 'a> {
Vacant(VacantEntry<'a, K, V>),
Occupied(OccupiedEntry<'a, K, V>),
}
A view into a single entry in a map, which may either be vacant or occupied. This enum is constructed from the entry method on BTreeMap.
Vacant(VacantEntry<'a, K, V>)A vacant Entry
Occupied(OccupiedEntry<'a, K, V>)An occupied Entry
impl<'a, K: Ord, V> Entry<'a, K, V>
[src]
fn or_insert(self, default: V) -> &'a mut VEnsures a value is in the entry by inserting the default if empty, and returns a mutable reference to the value in the entry.
use std::collections::BTreeMap;
let mut map: BTreeMap<&str, usize> = BTreeMap::new();
map.entry("poneyland").or_insert(12);
assert_eq!(map["poneyland"], 12); fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut VEnsures a value is in the entry by inserting the result of the default function if empty, and returns a mutable reference to the value in the entry.
use std::collections::BTreeMap;
let mut map: BTreeMap<&str, String> = BTreeMap::new();
let s = "hoho".to_string();
map.entry("poneyland").or_insert_with(|| s);
assert_eq!(map["poneyland"], "hoho".to_string()); fn key(&self) -> &KReturns a reference to this entry's key.
use std::collections::BTreeMap;
let mut map: BTreeMap<&str, usize> = BTreeMap::new();
assert_eq!(map.entry("poneyland").key(), &"poneyland"); impl<'a, K: 'a + Debug + Ord, V: 'a + Debug> Debug for Entry<'a, K, V>
fn fmt(&self, f: &mut Formatter) -> ResultFormats the value using the given formatter.
© 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/collections/btree_map/enum.Entry.html