Step 1.6: Static and dynamic dispatch

[ziimakc]

Resolves Step 1.6

Task

Given the following Storage abstraction and User entity:

trait Storage<K, V> {
    fn set(&mut self, key: K, val: V);
    fn get(&self, key: &K) -> Option<&V>;
    fn remove(&mut self, key: &K) -> Option<V>;
}

struct User {
    id: u64,
    email: Cow<'static, str>,
    activated: bool,
}

Implement UserRepository type with injectable Storage implementation, which can get, add, update and remove User in the injected Storage. Make two different implementations: one should use [dynamic dispatch][2] for Storage injecting, and the other one should use [static dispatch][1].

Solution

Implement UserRepository type with injectable Storage using static and dynamic dyspatch for storage. Add usage example and test.