1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! The trait for types that can be created from strings
15 /// A trait to abstract the idea of creating a new instance of a type from a
18 /// Parses a string `s` to return an optional value of this type. If the
19 /// string is ill-formatted, the None is returned.
20 fn from_str(s: &str) -> Option<Self>;
23 /// A utility function that just calls FromStr::from_str
24 pub fn from_str<A: FromStr>(s: &str) -> Option<A> {