Method get

code/chapter09/lru.rs:74–81

(&mut self, key: &K)

    }

    fn get(&mut self, key: &K) -> Option<&V> {
        if self.contains(key) { self.access(key); }

        let entries = &self.entries;
        self.map.get(key).and_then(move |&i| {
            entries[i].val.as_ref()
        })
    }

    fn get_mut(&mut self, key: &K) -> Option<&mut V> {
        if self.contains(key) { self.access(key); }