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core::iter: Move ExactSizeIterator impls to each struct definition

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This commit is contained in:
Ulrik Sverdrup 2016-04-18 23:44:02 +02:00
parent 085fddac50
commit 1cd8d1e2b9
1 changed files with 19 additions and 19 deletions
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38
src/libcore/iter/mod.rs
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@ -333,25 +333,6 @@ mod range;
mod sources;
mod traits;
// All adaptors that preserve the size of the wrapped iterator are fine
// Adaptors that may overflow in `size_hint` are not, i.e. `Chain`.
#[stable(feature = "rust1", since = "1.0.0")]
impl<I> ExactSizeIterator for Enumerate<I> where I: ExactSizeIterator {}
#[stable(feature = "rust1", since = "1.0.0")]
impl<I: ExactSizeIterator, F> ExactSizeIterator for Inspect<I, F> where
F: FnMut(&I::Item),
{}
#[stable(feature = "rust1", since = "1.0.0")]
impl<I> ExactSizeIterator for Rev<I>
where I: ExactSizeIterator + DoubleEndedIterator {}
#[stable(feature = "rust1", since = "1.0.0")]
impl<B, I: ExactSizeIterator, F> ExactSizeIterator for Map<I, F> where
F: FnMut(I::Item) -> B,
{}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A, B> ExactSizeIterator for Zip<A, B>
where A: ExactSizeIterator, B: ExactSizeIterator {}
/// An double-ended iterator with the direction inverted.
///
/// This `struct` is created by the [`rev()`] method on [`Iterator`]. See its
@ -382,6 +363,10 @@ impl<I> DoubleEndedIterator for Rev<I> where I: DoubleEndedIterator {
fn next_back(&mut self) -> Option<<I as Iterator>::Item> { self.iter.next() }
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<I> ExactSizeIterator for Rev<I>
where I: ExactSizeIterator + DoubleEndedIterator {}
/// An iterator that clones the elements of an underlying iterator.
///
/// This `struct` is created by the [`cloned()`] method on [`Iterator`]. See its
@ -679,6 +664,10 @@ impl<A, B> DoubleEndedIterator for Zip<A, B> where
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<A, B> ExactSizeIterator for Zip<A, B>
where A: ExactSizeIterator, B: ExactSizeIterator {}
/// An iterator that maps the values of `iter` with `f`.
///
/// This `struct` is created by the [`map()`] method on [`Iterator`]. See its
@ -771,6 +760,10 @@ impl<B, I: DoubleEndedIterator, F> DoubleEndedIterator for Map<I, F> where
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<B, I: ExactSizeIterator, F> ExactSizeIterator for Map<I, F>
where F: FnMut(I::Item) -> B {}
/// An iterator that filters the elements of `iter` with `predicate`.
///
/// This `struct` is created by the [`filter()`] method on [`Iterator`]. See its
@ -966,6 +959,9 @@ impl<I> DoubleEndedIterator for Enumerate<I> where
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<I> ExactSizeIterator for Enumerate<I> where I: ExactSizeIterator {}
/// An iterator with a `peek()` that returns an optional reference to the next
/// element.
///
@ -1655,3 +1651,7 @@ impl<I: DoubleEndedIterator, F> DoubleEndedIterator for Inspect<I, F>
self.do_inspect(next)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<I: ExactSizeIterator, F> ExactSizeIterator for Inspect<I, F>
where F: FnMut(&I::Item) {}