pub struct VacantEntry<'a, K, V> where
    K: 'a,
    V: 'a, 
{ base: RustcVacantEntry<'a, K, V, Global>, }
Expand description

A view into a vacant entry in a HashMap. It is part of the Entry enum.

Fields

base: RustcVacantEntry<'a, K, V, Global>

Implementations

Gets a reference to the key that would be used when inserting a value through the VacantEntry.

Examples
use std::collections::HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();
assert_eq!(map.entry("poneyland").key(), &"poneyland");

Take ownership of the key.

Examples
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();
}

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);
source

pub fn insert_entry(self, value: V) -> OccupiedEntry<'a, K, V>

🔬 This is a nightly-only experimental API. (entry_insert)

Sets 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);

Trait Implementations

Formats the value using the given formatter. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.