pub struct OccupiedEntry<'a, K: 'a + Eq + Hash, V: 'a> { /* fields omitted */ }
A view into an occupied entry in a Cache
.
It is part of the Entry
enum.
Gets a reference to the key in the entry.
use cache_2q::{Cache, Entry};
let mut cache: Cache<&str, u32> = Cache::new(8);
cache.entry("poneyland").or_insert(12);
match cache.entry("poneyland") {
Entry::Vacant(_) => {
panic!("Should be occupied");
},
Entry::Occupied(occupied) => {
assert_eq!(occupied.key(), &"poneyland");
},
}
Gets a reference to the value in the entry.
use cache_2q::{Cache, Entry};
let mut cache: Cache<&str, u32> = Cache::new(8);
cache.entry("poneyland").or_insert(12);
if let Entry::Occupied(o) = cache.entry("poneyland") {
assert_eq!(o.get(), &12);
} else {
panic!("Entry should be occupied");
}
Gets a mutable reference to the value in the entry.
use cache_2q::{Cache, Entry};
let mut cache: Cache<&str, u32> = Cache::new(8);
cache.entry("poneyland").or_insert(12);
assert_eq!(*cache.get("poneyland").unwrap(), 12);
if let Entry::Occupied(mut o) = cache.entry("poneyland") {
*o.get_mut() += 10;
} else {
panic!("Entry should be occupied");
}
assert_eq!(*cache.get("poneyland").unwrap(), 22);
Converts the OccupiedEntry into a mutable reference to the value in the entry
with a lifetime bound to the cache itself.
use cache_2q::{Cache, Entry};
let mut cache: Cache<&str, u32> = Cache::new(8);
cache.entry("poneyland").or_insert(12);
assert_eq!(*cache.get("poneyland").unwrap(), 12);
if let Entry::Occupied(o) = cache.entry("poneyland") {
*o.into_mut() += 10;
} else {
panic!("Entry should be occupied");
}
assert_eq!(*cache.get("poneyland").unwrap(), 22);
Sets the value of the entry, and returns the entry's old value.
use cache_2q::{Cache, Entry};
let mut cache: Cache<&str, u32> = Cache::new(8);
cache.entry("poneyland").or_insert(12);
if let Entry::Occupied(mut o) = cache.entry("poneyland") {
assert_eq!(o.insert(15), 12);
} else {
panic!("Entry should be occupied");
}
assert_eq!(*cache.get("poneyland").unwrap(), 15);
Takes the value out of the entry, and returns it.
use cache_2q::{Cache, Entry};
let mut cache: Cache<&str, u32> = Cache::new(8);
cache.entry("poneyland").or_insert(12);
if let Entry::Occupied(o) = cache.entry("poneyland") {
assert_eq!(o.remove(), 12);
} else {
panic!("Entry should be occupied");
}
assert_eq!(cache.contains_key("poneyland"), false);
Formats the value using the given formatter. Read more