| 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(|()| {}) |
| } |
| } |
