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