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| author | kennytm <kennytm@gmail.com> | 2019-03-24 15:32:52 +0800 |
|---|---|---|
| committer | kennytm <kennytm@gmail.com> | 2019-03-24 19:00:10 +0800 |
| commit | cb2dde63d5cdcee619ad65de79029629ccee7604 (patch) | |
| tree | 8872664023450cea7a751b0f445e63e2b60379d2 /src/liballoc | |
| parent | 1d286f7918307f1b2bfa9a157070cc99c0465f30 (diff) | |
| parent | 739ba0417ae6477ffc9c5e8298b5075725d52420 (diff) | |
| download | rust-cb2dde63d5cdcee619ad65de79029629ccee7604.tar.gz rust-cb2dde63d5cdcee619ad65de79029629ccee7604.zip | |
Rollup merge of #59328 - koalatux:iter-nth-back, r=scottmcm
Implement specialized nth_back() for Box and Windows. Hi there, this is my first pull request to rust :-) I started implementing some specializations for DoubleEndedIterator::nth_back() and these are the first two. The problem has been discussed in #54054 and nth_back() is tracked in #56995. I'm stuck with the next implementation so I though I do a PR for the ones I'm confident with to get some feedback.
Diffstat (limited to 'src/liballoc')
| -rw-r--r-- | src/liballoc/boxed.rs | 3 | ||||
| -rw-r--r-- | src/liballoc/lib.rs | 1 |
2 files changed, 4 insertions, 0 deletions
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs index 9bce142b483..b2315c6a739 100644 --- a/src/liballoc/boxed.rs +++ b/src/liballoc/boxed.rs @@ -677,6 +677,9 @@ impl<I: DoubleEndedIterator + ?Sized> DoubleEndedIterator for Box<I> { fn next_back(&mut self) -> Option<I::Item> { (**self).next_back() } + fn nth_back(&mut self, n: usize) -> Option<I::Item> { + (**self).nth_back(n) + } } #[stable(feature = "rust1", since = "1.0.0")] impl<I: ExactSizeIterator + ?Sized> ExactSizeIterator for Box<I> { diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs index 440ce8ac5e8..90ff56814fb 100644 --- a/src/liballoc/lib.rs +++ b/src/liballoc/lib.rs @@ -115,6 +115,7 @@ #![feature(maybe_uninit, maybe_uninit_slice, maybe_uninit_array)] #![feature(alloc_layout_extra)] #![feature(try_trait)] +#![feature(iter_nth_back)] // Allow testing this library |