| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| |
| trait Deserializer { |
| fn read_int(&self) -> isize; |
| } |
| |
| trait Deserializable<D:Deserializer> { |
| fn deserialize(d: &D) -> Self; |
| } |
| |
| impl<D:Deserializer> Deserializable<D> for isize { |
| fn deserialize(d: &D) -> isize { |
| return d.read_int(); |
| } |
| } |
| |
| struct FromThinAir { dummy: () } |
| |
| impl Deserializer for FromThinAir { |
| fn read_int(&self) -> isize { 22 } |
| } |
| |
| pub fn main() { |
| let d = FromThinAir { dummy: () }; |
| let i: isize = Deserializable::deserialize(&d); |
| assert_eq!(i, 22); |
| } |