1 // Copyright 2017 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 use iter::FromIterator;
13 /// Collapses all unit items from an iterator into one.
15 /// This is more useful when combined with higher-level abstractions, like
16 /// collecting to a `Result<(), E>` where you only care about errors:
20 /// let data = vec![1, 2, 3, 4, 5];
21 /// let res: Result<()> = data.iter()
22 /// .map(|x| writeln!(stdout(), "{}", x))
24 /// assert!(res.is_ok());
26 #[stable(feature = "unit_from_iter", since = "1.23.0")]
27 impl FromIterator<()> for () {
28 fn from_iter<I: IntoIterator<Item=()>>(iter: I) -> Self {
29 iter.into_iter().for_each(|()| {})