std::collections::hash_map::Entry
Enum std::collections::hash_map::Entry
pub enum Entry<'a, K: 'a, V: 'a> {
Occupied(OccupiedEntry<'a, K, V>),
Vacant(VacantEntry<'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 HashMap.
Variants
Occupied(OccupiedEntry<'a, K, V>)An occupied entry.
Vacant(VacantEntry<'a, K, V>)A vacant entry.
Methods
impl<'a, K, V> Entry<'a, K, V>
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fn or_insert(self, default: V) -> &'a mut V
Ensures a value is in the entry by inserting the default if empty, and returns a mutable reference to the value 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["poneyland"], 12);
*map.entry("poneyland").or_insert(12) += 10;
assert_eq!(map["poneyland"], 22); fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut V
Ensures 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.
Examples
use std::collections::HashMap;
let mut map: HashMap<&str, String> = HashMap::new();
let s = "hoho".to_string();
map.entry("poneyland").or_insert_with(|| s);
assert_eq!(map["poneyland"], "hoho".to_string()); fn key(&self) -> &K1.10.0
Returns a reference to this entry's key.
Examples
use std::collections::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
assert_eq!(map.entry("poneyland").key(), &"poneyland"); Trait Implementations
impl<'a, K: 'a + Debug, V: 'a + Debug> Debug for Entry<'a, K, V>
1.12.0
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter.
impl<'a, K, V> Placer<V> for Entry<'a, K, V>
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type Place = EntryPlace<'a, K, V>
Place is the intermedate agent guarding the uninitialized state for Data. Read more
fn make_place(self) -> EntryPlace<'a, K, V>
Creates a fresh place from self.
© 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/hash_map/enum.Entry.html
