Struct scc::hash_cache::OccupiedEntry

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pub struct OccupiedEntry<'h, K, V, H = RandomState>where
    H: BuildHasher,
{ /* private fields */ }

Expand description

OccupiedEntry is a view into an occupied cache entry in a HashCache.

Implementations§

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impl<'h, K, V, H> OccupiedEntry<'h, K, V, H>
where K: Eq + Hash, H: BuildHasher,

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pub fn key(&self) -> &K

Gets a reference to the key in the entry.

§Examples

use scc::HashCache;

let hashcache: HashCache<u64, u32> = HashCache::default();

assert_eq!(hashcache.entry(29).or_default().1.key(), &29);

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

Takes ownership of the key and value from the HashCache.

§Examples

use scc::HashCache;
use scc::hash_cache::Entry;

let hashcache: HashCache<u64, u32> = HashCache::default();

hashcache.entry(11).or_put(17);

if let Entry::Occupied(o) = hashcache.entry(11) {
    assert_eq!(o.remove_entry(), (11, 17));
};

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pub fn get(&self) -> &V

Gets a reference to the value in the entry.

§Examples

use scc::HashCache;
use scc::hash_cache::Entry;

let hashcache: HashCache<u64, u32> = HashCache::default();

hashcache.entry(19).or_put(11);

if let Entry::Occupied(o) = hashcache.entry(19) {
    assert_eq!(o.get(), &11);
};

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

Gets a mutable reference to the value in the entry.

§Examples

use scc::HashCache;
use scc::hash_cache::Entry;

let hashcache: HashCache<u64, u32> = HashCache::default();

hashcache.entry(37).or_put(11);

if let Entry::Occupied(mut o) = hashcache.entry(37) {
    *o.get_mut() += 18;
    assert_eq!(*o.get(), 29);
}

assert_eq!(*hashcache.get(&37).unwrap().get(), 29);

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pub fn put(&mut self, val: V) -> V

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

§Examples

use scc::HashCache;
use scc::hash_cache::Entry;

let hashcache: HashCache<u64, u32> = HashCache::default();

hashcache.entry(37).or_put(11);

if let Entry::Occupied(mut o) = hashcache.entry(37) {
    assert_eq!(o.put(17), 11);
}

assert_eq!(*hashcache.get(&37).unwrap().get(), 17);

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pub fn remove(self) -> V

Takes the value out of the entry, and returns it.

§Examples

use scc::HashCache;
use scc::hash_cache::Entry;

let hashcache: HashCache<u64, u32> = HashCache::default();

hashcache.entry(11).or_put(17);

if let Entry::Occupied(o) = hashcache.entry(11) {
    assert_eq!(o.remove(), 17);
};