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1 | // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | #![feature(rustc_private)] | |
12 | ||
13 | extern crate serialize; | |
14 | ||
15 | use serialize::{Encodable, Decodable}; | |
16 | use std::fmt::Display; | |
17 | ||
18 | pub trait Entity : Decodable + Encodable + Sized { | |
19 | type Key: Clone + Decodable + Encodable + ToString + Display + Eq + Ord + Sized; | |
20 | ||
21 | fn id(&self) -> Self::Key; | |
22 | ||
23 | fn find_by_id(id: Self::Key) -> Option<Self>; | |
24 | } | |
25 | ||
26 | pub struct DbRef<E: Entity> { | |
27 | pub id: E::Key, | |
28 | } | |
29 | ||
30 | impl<E> DbRef<E> where E: Entity { | |
31 | fn get(self) -> Option<E> { | |
32 | E::find_by_id(self.id) | |
33 | } | |
34 | } | |
35 | ||
36 | fn main() {} |