pub struct VacantEntry<'a, K: 'a, V: 'a> { /* fields omitted */ }
A view into a vacant entry in a HashMap. It is part of the Entry enum.
impl<'a, K: 'a, V: 'a> VacantEntry<'a, K, V>
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pub fn key(&self) -> &K
Gets a reference to the key that would be used when inserting a value through the VacantEntry.
use std::collections::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
assert_eq!(map.entry("poneyland").key(), &"poneyland"); pub fn into_key(self) -> K
Take ownership of the key.
use std::collections::HashMap;
use std::collections::hash_map::Entry;
let mut map: HashMap<&str, u32> = HashMap::new();
if let Entry::Vacant(v) = map.entry("poneyland") {
v.into_key();
} pub fn insert(self, value: V) -> &'a mut V
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Sets the value of the entry with the VacantEntry's key, and returns a mutable reference to it.
use std::collections::HashMap;
use std::collections::hash_map::Entry;
let mut map: HashMap<&str, u32> = HashMap::new();
if let Entry::Vacant(o) = map.entry("poneyland") {
o.insert(37);
}
assert_eq!(map["poneyland"], 37); impl<'a, K: 'a + Debug, V: 'a> Debug for VacantEntry<'a, K, V>
fn fmt(&self, f: &mut Formatter) -> Result
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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/hash_map/struct.VacantEntry.html