Enum std::collections::hash_map::RawEntryMut   [−][src]
pub enum RawEntryMut<'a, K: 'a, V: 'a, S: 'a> {
    Occupied(RawOccupiedEntryMut<'a, K, V, S>),
    Vacant(RawVacantEntryMut<'a, K, V, S>),
}Expand description
A view into a single entry in a map, which may either be vacant or occupied.
This is a lower-level version of Entry.
This enum is constructed through the raw_entry_mut method on HashMap,
then calling one of the methods of that RawEntryBuilderMut.
Variants
Occupied(RawOccupiedEntryMut<'a, K, V, S>)An occupied entry.
Tuple Fields of Occupied
0: RawOccupiedEntryMut<'a, K, V, S>Vacant(RawVacantEntryMut<'a, K, V, S>)A vacant entry.
Tuple Fields of Vacant
0: RawVacantEntryMut<'a, K, V, S>Implementations
pub fn or_insert(self, default_key: K, default_val: V) -> (&'a mut K, &'a mut V) where
    K: Hash,
    S: BuildHasher, 
pub fn or_insert(self, default_key: K, default_val: V) -> (&'a mut K, &'a mut V) where
    K: Hash,
    S: BuildHasher, 
Ensures a value is in the entry by inserting the default if empty, and returns mutable references to the key and value in the entry.
Examples
#![feature(hash_raw_entry)]
use std::collections::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
map.raw_entry_mut().from_key("poneyland").or_insert("poneyland", 3);
assert_eq!(map["poneyland"], 3);
*map.raw_entry_mut().from_key("poneyland").or_insert("poneyland", 10).1 *= 2;
assert_eq!(map["poneyland"], 6);pub fn or_insert_with<F>(self, default: F) -> (&'a mut K, &'a mut V) where
    F: FnOnce() -> (K, V),
    K: Hash,
    S: BuildHasher, 
pub fn or_insert_with<F>(self, default: F) -> (&'a mut K, &'a mut V) where
    F: FnOnce() -> (K, V),
    K: Hash,
    S: BuildHasher, 
Ensures a value is in the entry by inserting the result of the default function if empty, and returns mutable references to the key and value in the entry.
Examples
#![feature(hash_raw_entry)]
use std::collections::HashMap;
let mut map: HashMap<&str, String> = HashMap::new();
map.raw_entry_mut().from_key("poneyland").or_insert_with(|| {
    ("poneyland", "hoho".to_string())
});
assert_eq!(map["poneyland"], "hoho".to_string());Provides in-place mutable access to an occupied entry before any potential inserts into the map.
Examples
#![feature(hash_raw_entry)]
use std::collections::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
map.raw_entry_mut()
   .from_key("poneyland")
   .and_modify(|_k, v| { *v += 1 })
   .or_insert("poneyland", 42);
assert_eq!(map["poneyland"], 42);
map.raw_entry_mut()
   .from_key("poneyland")
   .and_modify(|_k, v| { *v += 1 })
   .or_insert("poneyland", 0);
assert_eq!(map["poneyland"], 43);