Struct std::collections::hash_map::VacantEntry 1.0.0[−][src]
pub struct VacantEntry<'a, K: 'a, V: 'a> { /* fields omitted */ }Expand description
A view into a vacant entry in a HashMap.
It is part of the Entry enum.
Implementations
Sets the value of the entry with the VacantEntry’s key,
and returns a mutable reference to it.
Examples
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);RunSets the value of the entry with the VacantEntry’s key,
and returns an OccupiedEntry.
Examples
#![feature(entry_insert)]
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_entry(37);
}
assert_eq!(map["poneyland"], 37);Run