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);Run