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Diffstat (limited to '')
-rw-r--r-- | library/core/src/iter/adapters/cloned.rs | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/library/core/src/iter/adapters/cloned.rs b/library/core/src/iter/adapters/cloned.rs index aba24a79d..914ff86c1 100644 --- a/library/core/src/iter/adapters/cloned.rs +++ b/library/core/src/iter/adapters/cloned.rs @@ -1,7 +1,7 @@ use crate::iter::adapters::{ zip::try_get_unchecked, TrustedRandomAccess, TrustedRandomAccessNoCoerce, }; -use crate::iter::{FusedIterator, TrustedLen}; +use crate::iter::{FusedIterator, TrustedLen, UncheckedIterator}; use crate::ops::Try; /// An iterator that clones the elements of an underlying iterator. @@ -140,3 +140,16 @@ where T: Clone, { } + +impl<'a, I, T: 'a> UncheckedIterator for Cloned<I> +where + I: UncheckedIterator<Item = &'a T>, + T: Clone, +{ + unsafe fn next_unchecked(&mut self) -> T { + // SAFETY: `Cloned` is 1:1 with the inner iterator, so if the caller promised + // that there's an element left, the inner iterator has one too. + let item = unsafe { self.it.next_unchecked() }; + item.clone() + } +} |