]>
git.proxmox.com Git - rustc.git/blob - vendor/itertools-0.8.2/src/concat_impl.rs
3 /// Combine all an iterator's elements into one element by using `Extend`.
5 /// `IntoIterator`-enabled version of `.concat()`
7 /// This combinator will extend the first item with each of the rest of the
8 /// items of the iterator. If the iterator is empty, the default value of
9 /// `I::Item` is returned.
12 /// use itertools::concat;
14 /// let input = vec![vec![1], vec![2, 3], vec![4, 5, 6]];
15 /// assert_eq!(concat(input), vec![1, 2, 3, 4, 5, 6]);
17 pub fn concat
<I
>(iterable
: I
) -> I
::Item
18 where I
: IntoIterator
,
19 I
::Item
: Extend
<<<I
as IntoIterator
>::Item
as IntoIterator
>::Item
> + IntoIterator
+ Default
21 iterable
.into_iter().fold1(|mut a
, b
| { a.extend(b); a }
).unwrap_or_else(|| <_
>::default())