Method with_value_mut

src/models/common.rs:656–663

(&self, k: &K, f: F)

    }

    pub fn with_value_mut<F, R>(&self, k: &K, f: F) -> Option<R>
    where
        F: Fn(&mut V) -> R,
    {
        let index = self.hash_key(k);
        let mut ht = self.hash_table_list[index].lock().unwrap();
        ht.get_mut(k).map(f)
    }

    pub fn map_m<F>(&self, f: F)
    where