| // Copyright 2012-2014 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 to_str { |
| fn to_string_(&self) -> String; |
| } |
| |
| impl to_str for isize { |
| fn to_string_(&self) -> String { self.to_string() } |
| } |
| |
| impl<T:to_str> to_str for Vec<T> { |
| fn to_string_(&self) -> String { |
| format!("[{}]", |
| self.iter() |
| .map(|e| e.to_string_()) |
| .collect::<Vec<String>>() |
| .join(", ")) |
| } |
| } |
| |
| pub fn main() { |
| assert_eq!(1.to_string_(), "1".to_string()); |
| assert_eq!((vec!(2, 3, 4)).to_string_(), "[2, 3, 4]".to_string()); |
| |
| fn indirect<T:to_str>(x: T) -> String { |
| format!("{}!", x.to_string_()) |
| } |
| assert_eq!(indirect(vec!(10, 20)), "[10, 20]!".to_string()); |
| |
| fn indirect2<T:to_str>(x: T) -> String { |
| indirect(x) |
| } |
| assert_eq!(indirect2(vec!(1)), "[1]!".to_string()); |
| } |