// 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() {} |