| // Copyright 2015 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 Stringify { |
| fn to_string(&self) -> String; |
| } |
| |
| impl Stringify for u32 { |
| fn to_string(&self) -> String { format!("u32: {}", *self) } |
| } |
| |
| impl Stringify for f32 { |
| fn to_string(&self) -> String { format!("f32: {}", *self) } |
| } |
| |
| fn print<T: Stringify>(x: T) -> String { |
| x.to_string() |
| } |
| |
| fn main() { |
| assert_eq!(&print(5), "u32: 5"); |
| assert_eq!(&print(5.0), "f32: 5"); |
| } |