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to_str.rs
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to_str.rs
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// Copyright 2012-2013 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.
/*!
The `ToStr` trait for converting to strings
*/
use fmt;
/// A generic trait for converting a value to a string
pub trait ToStr {
/// Converts the value of `self` to an owned string
fn to_str(&self) -> ~str;
}
/// Trait for converting a type to a string, consuming it in the process.
pub trait IntoStr {
/// Consume and convert to a string.
fn into_str(self) -> ~str;
}
impl<T: fmt::Show> ToStr for T {
fn to_str(&self) -> ~str { format!("{}", *self) }
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_simple_types() {
assert_eq!(1i.to_str(), ~"1");
assert_eq!((-1i).to_str(), ~"-1");
assert_eq!(200u.to_str(), ~"200");
assert_eq!(2u8.to_str(), ~"2");
assert_eq!(true.to_str(), ~"true");
assert_eq!(false.to_str(), ~"false");
assert_eq!(().to_str(), ~"()");
assert_eq!((~"hi").to_str(), ~"hi");
}
#[test]
fn test_vectors() {
let x: ~[int] = ~[];
assert_eq!(x.to_str(), ~"[]");
assert_eq!((~[1]).to_str(), ~"[1]");
assert_eq!((~[1, 2, 3]).to_str(), ~"[1, 2, 3]");
assert!((~[~[], ~[1], ~[1, 1]]).to_str() ==
~"[[], [1], [1, 1]]");
}
}