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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 09:26:03 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 09:26:03 +0000 |
commit | 9918693037dce8aa4bb6f08741b6812923486c18 (patch) | |
tree | 21d2b40bec7e6a7ea664acee056eb3d08e15a1cf /vendor/itertools-0.11.0/src/concat_impl.rs | |
parent | Releasing progress-linux version 1.75.0+dfsg1-5~progress7.99u1. (diff) | |
download | rustc-9918693037dce8aa4bb6f08741b6812923486c18.tar.xz rustc-9918693037dce8aa4bb6f08741b6812923486c18.zip |
Merging upstream version 1.76.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/itertools-0.11.0/src/concat_impl.rs')
-rw-r--r-- | vendor/itertools-0.11.0/src/concat_impl.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/vendor/itertools-0.11.0/src/concat_impl.rs b/vendor/itertools-0.11.0/src/concat_impl.rs new file mode 100644 index 000000000..f022ec90a --- /dev/null +++ b/vendor/itertools-0.11.0/src/concat_impl.rs @@ -0,0 +1,23 @@ +use crate::Itertools; + +/// Combine all an iterator's elements into one element by using [`Extend`]. +/// +/// [`IntoIterator`]-enabled version of [`Itertools::concat`]. +/// +/// This combinator will extend the first item with each of the rest of the +/// items of the iterator. If the iterator is empty, the default value of +/// `I::Item` is returned. +/// +/// ```rust +/// use itertools::concat; +/// +/// let input = vec![vec![1], vec![2, 3], vec![4, 5, 6]]; +/// assert_eq!(concat(input), vec![1, 2, 3, 4, 5, 6]); +/// ``` +pub fn concat<I>(iterable: I) -> I::Item + where I: IntoIterator, + I::Item: Extend<<<I as IntoIterator>::Item as IntoIterator>::Item> + IntoIterator + Default +{ + #[allow(deprecated)] //TODO: once msrv hits 1.51. replace `fold1` with `reduce` + iterable.into_iter().fold1(|mut a, b| { a.extend(b); a }).unwrap_or_default() +} |