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Implement TrustedLen for Take<Repeat> and Take<RangeFrom>

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oberien
2018-01-18 18:40:08 +01:00
parent 3986539df6
commit a1809d5784
3 changed files with 9 additions and 0 deletions
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3
src/libcore/iter/mod.rs
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@@ -2322,6 +2322,9 @@ impl<I> ExactSizeIterator for Take<I> where I: ExactSizeIterator {}
#[unstable(feature = "fused", issue = "35602")] #[unstable(feature = "fused", issue = "35602")]
impl<I> FusedIterator for Take<I> where I: FusedIterator {} impl<I> FusedIterator for Take<I> where I: FusedIterator {}
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<I: TrustedLen> TrustedLen for Take<I> {}
/// An iterator to maintain state while iterating another iterator. /// An iterator to maintain state while iterating another iterator.
/// ///
/// This `struct` is created by the [`scan`] method on [`Iterator`]. See its /// This `struct` is created by the [`scan`] method on [`Iterator`]. See its

3
src/libcore/iter/range.rs
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@@ -325,6 +325,9 @@ impl<A: Step> Iterator for ops::RangeFrom<A> {
#[unstable(feature = "fused", issue = "35602")] #[unstable(feature = "fused", issue = "35602")]
impl<A: Step> FusedIterator for ops::RangeFrom<A> {} impl<A: Step> FusedIterator for ops::RangeFrom<A> {}
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<A: Step> TrustedLen for ops::RangeFrom<A> {}
#[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")] #[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")]
impl<A: Step> Iterator for ops::RangeInclusive<A> { impl<A: Step> Iterator for ops::RangeInclusive<A> {
type Item = A; type Item = A;

3
src/libcore/iter/sources.rs
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@@ -44,6 +44,9 @@ impl<A: Clone> DoubleEndedIterator for Repeat<A> {
#[unstable(feature = "fused", issue = "35602")] #[unstable(feature = "fused", issue = "35602")]
impl<A: Clone> FusedIterator for Repeat<A> {} impl<A: Clone> FusedIterator for Repeat<A> {}
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<A: Clone> TrustedLen for Repeat<A> {}
/// Creates a new iterator that endlessly repeats a single element. /// Creates a new iterator that endlessly repeats a single element.
/// ///
/// The `repeat()` function repeats a single value over and over and over and /// The `repeat()` function repeats a single value over and over and over and