| // run-pass | |
| #![allow(dead_code)] | |
| #![feature(rustc_private)] | |
| extern crate serialize; | |
| use serialize::{Encodable, Decodable}; | |
| use std::fmt::Display; | |
| pub trait Entity : Decodable + Encodable + Sized { | |
| type Key: Clone + Decodable + Encodable + ToString + Display + Eq + Ord + Sized; | |
| fn id(&self) -> Self::Key; | |
| fn find_by_id(id: Self::Key) -> Option<Self>; | |
| } | |
| pub struct DbRef<E: Entity> { | |
| pub id: E::Key, | |
| } | |
| impl<E> DbRef<E> where E: Entity { | |
| fn get(self) -> Option<E> { | |
| E::find_by_id(self.id) | |
| } | |
| } | |
| fn main() {} |