Struct OccupiedEntry

pub struct OccupiedEntry<'a, K, V, A>
where
    A: Allocator + Clone,
{ /* private fields */ }

Implementations

impl<'a, K, V, A> OccupiedEntry<'a, K, V, A>

where A: Allocator + Clone,

pub fn key(&self) -> &K

Gets a reference to the key in the entry.

Examples

use xsl::collections::RBTreeMap;

let mut map: RBTreeMap<&str, usize> = RBTreeMap::new();
map.entry("poneyland").or_insert(12);
assert_eq!(map.entry("poneyland").key(), &"poneyland");

pub fn remove_entry(self) -> (K, V)

Take ownership of the key and value from the map.

Examples

use xsl::collections::rbtree_map::Entry;
use xsl::collections::RBTreeMap;

let mut map: RBTreeMap<&str, usize> = RBTreeMap::new();
map.entry("poneyland").or_insert(12);

if let Entry::Occupied(o) = map.entry("poneyland") {
    // We delete the entry from the map.
    o.remove_entry();
}

// If now try to get the value, it will panic:
// println!("{}", map["poneyland"]);

pub fn get(&self) -> &V

Gets a reference to the value in the entry.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::new();
match map.entry(&"poneyland") {
    Entry::Occupied(_) => panic!("entry was occupied"),
    Entry::Vacant(v) => v.insert(12),
};

if let Entry::Occupied(o) = map.entry("poneyland") {
    assert_eq!(o.get(), &12);
}

pub fn get_mut(&mut self) -> &mut V

Gets a mutable reference to the value in the entry.

If you need a reference to the OccupiedEntry which may outlive the destruction of the Entry value, see into_mut.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::new();
match map.entry(&"poneyland") {
    Entry::Occupied(_) => panic!("entry was occupied"),
    Entry::Vacant(v) => v.insert(12),
};

assert_eq!(map["poneyland"], 12);
if let Entry::Occupied(mut o) = map.entry("poneyland") {
    *o.get_mut() += 10;
    assert_eq!(*o.get(), 22);

    // We can use the same Entry multiple times.
    *o.get_mut() += 2;
}

assert_eq!(map["poneyland"], 24);

pub fn into_mut(self) -> &'a mut V

Converts the OccupiedEntry into a mutable reference to the value in the entry with a lifetime bound to the map itself.

If you need multiple references to the OccupiedEntry, see get_mut.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::new();
match map.entry(&"poneyland") {
    Entry::Occupied(_) => panic!("entry was occupied"),
    Entry::Vacant(v) => v.insert(12),
};

assert_eq!(map["poneyland"], 12);
if let Entry::Occupied(o) = map.entry("poneyland") {
    *o.into_mut() += 10;
}

assert_eq!(map["poneyland"], 22);

pub fn insert(&mut self, value: V) -> V

Sets the value of the entry, and returns the entry’s old value.

Examples

use std::collections::HashMap;
use std::collections::hash_map::Entry;

let mut map: HashMap<&str, u32> = HashMap::new();
match map.entry(&"poneyland") {
    Entry::Occupied(_) => panic!("entry was occupied"),
    Entry::Vacant(v) => v.insert(12),
};

if let Entry::Occupied(mut o) = map.entry("poneyland") {
    assert_eq!(o.insert(15), 12);
}

assert_eq!(map["poneyland"], 15);