FusedIterator in core::iter - Rust
Description: An iterator that always continues to yield `None` when exhausted.

# Trait FusedIterator

1.26.0 · Source

    pub trait FusedIterator: Iterator { }

Expand description

An iterator that always continues to yield `None` when exhausted.

Calling next on a fused iterator that has returned `None` once is guaranteed to return `None` again. This trait should be implemented by all iterators that behave this way because it allows optimizing `Iterator::fuse()`.

Note: In general, you should not use `FusedIterator` in generic bounds if you need a fused iterator. Instead, you should just call `Iterator::fuse()` on the iterator. If the iterator is already fused, the additional `Fuse` wrapper will be a no-op with no performance penalty.

## Implementors§

1.26.0 · Source§

### impl FusedIterator for core::ascii::EscapeDefault

1.26.0 · Source§

### impl FusedIterator for core::char::EscapeDebug

1.26.0 · Source§

### impl FusedIterator for core::char::EscapeDefault

1.26.0 · Source§

### impl FusedIterator for core::char::EscapeUnicode

1.26.0 · Source§

### impl FusedIterator for ToLowercase

1.26.0 · Source§

### impl FusedIterator for ToUppercase

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### impl FusedIterator for core::ffi::c_str::Bytes<'_>

1.26.0 · Source§

### impl FusedIterator for core::str::Bytes<'_>

1.26.0 · Source§

### impl FusedIterator for CharIndices<'_>

1.26.0 · Source§

### impl FusedIterator for Chars<'_>

1.26.0 · Source§

### impl FusedIterator for EncodeUtf16<'_>

1.26.0 · Source§

### impl FusedIterator for Lines<'_>

1.26.0 · Source§

### impl FusedIterator for LinesAny<'_>

1.34.0 · Source§

### impl FusedIterator for SplitAsciiWhitespace<'_>

1.26.0 · Source§

### impl FusedIterator for SplitWhitespace<'_>

1.79.0 · Source§

### impl FusedIterator for Utf8Chunks<'_>

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### impl<'a> FusedIterator for Source<'a>

1.60.0 · Source§

### impl<'a> FusedIterator for EscapeAscii<'a>

1.34.0 · Source§

### impl<'a> FusedIterator for core::str::EscapeDebug<'a>

1.34.0 · Source§

### impl<'a> FusedIterator for core::str::EscapeDefault<'a>

1.34.0 · Source§

### impl<'a> FusedIterator for core::str::EscapeUnicode<'a>

1.26.0 · Source§

### impl<'a, I, T> FusedIterator for Cloned<I>
where I: FusedIterator<Item = &'a T>, T: Clone + 'a,

1.36.0 · Source§

### impl<'a, I, T> FusedIterator for Copied<I>
where I: FusedIterator<Item = &'a T>, T: Copy + 'a,

1.26.0 · Source§

### impl<'a, P> FusedIterator for RMatchIndices<'a, P>
where P: Pattern<Searcher<'a>: ReverseSearcher<'a>>,

1.26.0 · Source§

### impl<'a, P> FusedIterator for RMatches<'a, P>
where P: Pattern<Searcher<'a>: ReverseSearcher<'a>>,

1.26.0 · Source§

### impl<'a, P> FusedIterator for core::str::RSplit<'a, P>
where P: Pattern<Searcher<'a>: ReverseSearcher<'a>>,

1.26.0 · Source§

### impl<'a, P> FusedIterator for core::str::RSplitN<'a, P>
where P: Pattern<Searcher<'a>: ReverseSearcher<'a>>,

1.26.0 · Source§

### impl<'a, P> FusedIterator for RSplitTerminator<'a, P>
where P: Pattern<Searcher<'a>: ReverseSearcher<'a>>,

1.26.0 · Source§

### impl<'a, P: Pattern> FusedIterator for MatchIndices<'a, P>

1.26.0 · Source§

### impl<'a, P: Pattern> FusedIterator for Matches<'a, P>

1.26.0 · Source§

### impl<'a, P: Pattern> FusedIterator for core::str::Split<'a, P>

1.51.0 · Source§

### impl<'a, P: Pattern> FusedIterator for core::str::SplitInclusive<'a, P>

1.26.0 · Source§

### impl<'a, P: Pattern> FusedIterator for core::str::SplitN<'a, P>

1.26.0 · Source§

### impl<'a, P: Pattern> FusedIterator for SplitTerminator<'a, P>

1.26.0 · Source§

### impl<'a, T, P> FusedIterator for core::slice::RSplitN<'a, T, P>
where P: FnMut(&T) -> bool,

1.26.0 · Source§

### impl<'a, T, P> FusedIterator for RSplitNMut<'a, T, P>
where P: FnMut(&T) -> bool,

1.26.0 · Source§

### impl<'a, T, P> FusedIterator for core::slice::SplitN<'a, T, P>
where P: FnMut(&T) -> bool,

1.26.0 · Source§

### impl<'a, T, P> FusedIterator for SplitNMut<'a, T, P>
where P: FnMut(&T) -> bool,

1.77.0 · Source§

### impl<'a, T: 'a, P> FusedIterator for ChunkBy<'a, T, P>
where P: FnMut(&T, &T) -> bool,

1.77.0 · Source§

### impl<'a, T: 'a, P> FusedIterator for ChunkByMut<'a, T, P>
where P: FnMut(&T, &T) -> bool,

1.26.0 · Source§

### impl<A> FusedIterator for core::option::IntoIter<A>

1.26.0 · Source§

### impl<A> FusedIterator for core::option::Iter<'_, A>

1.26.0 · Source§

### impl<A> FusedIterator for core::option::IterMut<'_, A>

1.26.0 · Source§

### impl<A, B> FusedIterator for Chain<A, B>
where A: FusedIterator, B: FusedIterator<Item = A::Item>,

1.26.0 · Source§

### impl<A, B> FusedIterator for Zip<A, B>
where A: FusedIterator, B: FusedIterator,

1.28.0 · Source§

### impl<A, F: FnMut() -> A> FusedIterator for RepeatWith<F>

1.43.0 · Source§

### impl<A, F: FnOnce() -> A> FusedIterator for OnceWith<F>

1.26.0 · Source§

### impl<A: Clone> FusedIterator for Repeat<A>

1.82.0 · Source§

### impl<A: Clone> FusedIterator for RepeatN<A>

1.26.0 · Source§

### impl<A: Step> FusedIterator for Range<A>

1.26.0 · Source§

### impl<A: Step> FusedIterator for RangeFrom<A>

1.26.0 · Source§

### impl<A: Step> FusedIterator for RangeInclusive<A>

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### impl<A: Step> FusedIterator for IterRange<A>

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### impl<A: Step> FusedIterator for IterRangeFrom<A>

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### impl<A: Step> FusedIterator for IterRangeInclusive<A>

1.26.0 · Source§

### impl<B, I: FusedIterator, F> FusedIterator for FilterMap<I, F>
where F: FnMut(I::Item) -> Option<B>,

1.26.0 · Source§

### impl<B, I: FusedIterator, F> FusedIterator for Map<I, F>
where F: FnMut(I::Item) -> B,

1.26.0 · Source§

### impl<I> FusedIterator for Cycle<I>
where I: Clone + Iterator,

1.26.0 · Source§

### impl<I> FusedIterator for Enumerate<I>
where I: FusedIterator,

1.26.0 · Source§

### impl<I> FusedIterator for Fuse<I>
where I: Iterator,

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### impl<I> FusedIterator for Intersperse<I>
where I: FusedIterator, I::Item: Clone,

1.26.0 · Source§

### impl<I> FusedIterator for Rev<I>
where I: FusedIterator + DoubleEndedIterator,

1.26.0 · Source§

### impl<I> FusedIterator for Skip<I>
where I: FusedIterator,

1.26.0 · Source§

### impl<I> FusedIterator for Take<I>
where I: FusedIterator,

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### impl<I, F, R, const N: usize> FusedIterator for MapWindows<I, F, N>
where I: Iterator, F: FnMut(&[I::Item; N]) -> R,

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### impl<I, G> FusedIterator for IntersperseWith<I, G>
where I: FusedIterator, G: FnMut() -> I::Item,

1.26.0 · Source§

### impl<I, P> FusedIterator for SkipWhile<I, P>
where I: FusedIterator, P: FnMut(&I::Item) -> bool,

1.26.0 · Source§

### impl<I, P> FusedIterator for TakeWhile<I, P>
where I: FusedIterator, P: FnMut(&I::Item) -> bool,

1.29.0 · Source§

### impl<I, U> FusedIterator for Flatten<I>
where I: FusedIterator<Item: IntoIterator<IntoIter = U, Item = U::Item>>, U: Iterator,

1.26.0 · Source§

### impl<I, U, F> FusedIterator for FlatMap<I, U, F>
where I: FusedIterator, U: IntoIterator, F: FnMut(I::Item) -> U,

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### impl<I, const N: usize> FusedIterator for core::iter::ArrayChunks<I, N>
where I: FusedIterator,

1.26.0 · Source§

### impl<I: FusedIterator + ?Sized> FusedIterator for &mut I

1.26.0 · Source§

### impl<I: FusedIterator> FusedIterator for Peekable<I>

1.26.0 · Source§

### impl<I: FusedIterator, F> FusedIterator for Inspect<I, F>
where F: FnMut(&I::Item),

1.26.0 · Source§

### impl<I: FusedIterator, P> FusedIterator for Filter<I, P>
where P: FnMut(&I::Item) -> bool,

1.75.0 · Source§

### impl<I: Iterator<Item = u16> + FusedIterator> FusedIterator for DecodeUtf16<I>

1.26.0 · Source§

### impl<T> FusedIterator for core::result::IntoIter<T>

1.26.0 · Source§

### impl<T> FusedIterator for core::result::Iter<'_, T>

1.26.0 · Source§

### impl<T> FusedIterator for core::result::IterMut<'_, T>

1.26.0 · Source§

### impl<T> FusedIterator for Chunks<'_, T>

1.31.0 · Source§

### impl<T> FusedIterator for ChunksExact<'_, T>

1.31.0 · Source§

### impl<T> FusedIterator for ChunksExactMut<'_, T>

1.26.0 · Source§

### impl<T> FusedIterator for ChunksMut<'_, T>

1.26.0 · Source§

### impl<T> FusedIterator for core::slice::Iter<'_, T>

1.26.0 · Source§

### impl<T> FusedIterator for core::slice::IterMut<'_, T>

1.31.0 · Source§

### impl<T> FusedIterator for RChunks<'_, T>

1.31.0 · Source§

### impl<T> FusedIterator for RChunksExact<'_, T>

1.31.0 · Source§

### impl<T> FusedIterator for RChunksExactMut<'_, T>

1.31.0 · Source§

### impl<T> FusedIterator for RChunksMut<'_, T>

1.26.0 · Source§

### impl<T> FusedIterator for Windows<'_, T>

1.26.0 · Source§

### impl<T> FusedIterator for Empty<T>

1.26.0 · Source§

### impl<T> FusedIterator for Once<T>

1.34.0 · Source§

### impl<T, F> FusedIterator for Successors<T, F>
where F: FnMut(&T) -> Option<T>,

1.27.0 · Source§

### impl<T, P> FusedIterator for core::slice::RSplit<'_, T, P>
where P: FnMut(&T) -> bool,

1.27.0 · Source§

### impl<T, P> FusedIterator for RSplitMut<'_, T, P>
where P: FnMut(&T) -> bool,

1.26.0 · Source§

### impl<T, P> FusedIterator for core::slice::Split<'_, T, P>
where P: FnMut(&T) -> bool,

1.51.0 · Source§

### impl<T, P> FusedIterator for core::slice::SplitInclusive<'_, T, P>
where P: FnMut(&T) -> bool,

1.51.0 · Source§

### impl<T, P> FusedIterator for SplitInclusiveMut<'_, T, P>
where P: FnMut(&T) -> bool,

1.26.0 · Source§

### impl<T, P> FusedIterator for SplitMut<'_, T, P>
where P: FnMut(&T) -> bool,

1.40.0 · Source§

### impl<T, const N: usize> FusedIterator for core::array::IntoIter<T, N>

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### impl<T, const N: usize> FusedIterator for core::slice::ArrayChunks<'_, T, N>

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### impl<T, const N: usize> FusedIterator for ArrayChunksMut<'_, T, N>