# 1.26.0[−][src]Trait std::iter::FusedIterator

    pub trait FusedIterator: Iterator { }

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 for some significant optimizations.

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

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`impl FusedIterator for std::ascii::EscapeDefault`

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`impl FusedIterator for EscapeDebug`

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`impl FusedIterator for std::char::EscapeDefault`

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`impl FusedIterator for EscapeUnicode`

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`impl FusedIterator for ToLowercase`

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`impl FusedIterator for ToUppercase`

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`impl<'a> FusedIterator for Ancestors<'a>`

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`impl<'a> FusedIterator for Components<'a>`

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`impl<'a> FusedIterator for std::path::Iter<'a>`

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`impl<'a> FusedIterator for Bytes<'a>`

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`impl<'a> FusedIterator for CharIndices<'a>`

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`impl<'a> FusedIterator for Chars<'a>`

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`impl<'a> FusedIterator for EncodeUtf16<'a>`

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`impl<'a> FusedIterator for Lines<'a>`

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`impl<'a> FusedIterator for LinesAny<'a>`

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`impl<'a> FusedIterator for SplitAsciiWhitespace<'a>`

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`impl<'a> FusedIterator for SplitWhitespace<'a>`

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`impl<'a> FusedIterator for std::string::Drain<'a>`

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`impl<'a, A> FusedIterator for std::option::Iter<'a, A>`

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`impl<'a, A> FusedIterator for std::option::IterMut<'a, A>`

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`impl<'a, I> FusedIterator for &'a mut I where I: FusedIterator + ?Sized,`

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

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`impl<'a, K> FusedIterator for std::collections::hash_set::Drain<'a, K>`

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`impl<'a, K> FusedIterator for std::collections::hash_set::Iter<'a, K>`

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`impl<'a, K, V> FusedIterator for std::collections::btree_map::Iter<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::btree_map::IterMut<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::btree_map::Keys<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::btree_map::Range<'a, K, V>`

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`impl<'a, K, V> FusedIterator for RangeMut<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::btree_map::Values<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::btree_map::ValuesMut<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::hash_map::Drain<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::hash_map::Iter<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::hash_map::IterMut<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::hash_map::Keys<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::hash_map::Values<'a, K, V>`

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`impl<'a, K, V> FusedIterator for std::collections::hash_map::ValuesMut<'a, K, V>`

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

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

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

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

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`impl<'a, P> FusedIterator for std::str::RSplit<'a, P> where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,`

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`impl<'a, P> FusedIterator for std::str::RSplitN<'a, P> where P: Pattern<'a>, <P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,`

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

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`impl<'a, P> FusedIterator for std::str::Split<'a, P> where P: Pattern<'a>,`

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`impl<'a, P> FusedIterator for std::str::SplitN<'a, P> where P: Pattern<'a>,`

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

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`impl<'a, T> FusedIterator for std::collections::binary_heap::Drain<'a, T> where T: 'a,`

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`impl<'a, T> FusedIterator for std::collections::binary_heap::Iter<'a, T>`

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`impl<'a, T> FusedIterator for std::collections::btree_set::Difference<'a, T> where T: Ord,`

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`impl<'a, T> FusedIterator for std::collections::btree_set::Intersection<'a, T> where T: Ord,`

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`impl<'a, T> FusedIterator for std::collections::btree_set::Iter<'a, T>`

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`impl<'a, T> FusedIterator for std::collections::btree_set::Range<'a, T>`

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`impl<'a, T> FusedIterator for std::collections::btree_set::SymmetricDifference<'a, T> where T: Ord,`

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`impl<'a, T> FusedIterator for std::collections::btree_set::Union<'a, T> where T: Ord,`

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`impl<'a, T> FusedIterator for std::collections::linked_list::Iter<'a, T>`

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`impl<'a, T> FusedIterator for std::collections::linked_list::IterMut<'a, T>`

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`impl<'a, T> FusedIterator for std::collections::vec_deque::Drain<'a, T> where T: 'a,`

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`impl<'a, T> FusedIterator for std::collections::vec_deque::Iter<'a, T>`

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`impl<'a, T> FusedIterator for std::collections::vec_deque::IterMut<'a, T>`

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`impl<'a, T> FusedIterator for std::result::Iter<'a, T>`

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`impl<'a, T> FusedIterator for std::result::IterMut<'a, T>`

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`impl<'a, T> FusedIterator for Chunks<'a, T>`

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`impl<'a, T> FusedIterator for ChunksMut<'a, T>`

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`impl<'a, T> FusedIterator for ExactChunks<'a, T>`

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`impl<'a, T> FusedIterator for ExactChunksMut<'a, T>`

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`impl<'a, T> FusedIterator for std::slice::Iter<'a, T>`

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`impl<'a, T> FusedIterator for std::slice::IterMut<'a, T>`

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`impl<'a, T> FusedIterator for Windows<'a, T>`

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`impl<'a, T> FusedIterator for std::vec::Drain<'a, T>`

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`impl<'a, T, P> FusedIterator for std::slice::RSplit<'a, T, P> where P: FnMut(&T) -> bool,`

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

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

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

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`impl<'a, T, P> FusedIterator for std::slice::Split<'a, T, P> where P: FnMut(&T) -> bool,`

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

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

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

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`impl<'a, T, S> FusedIterator for std::collections::hash_set::Difference<'a, T, S> where T: Eq + Hash, S: BuildHasher,`

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`impl<'a, T, S> FusedIterator for std::collections::hash_set::Intersection<'a, T, S> where T: Eq + Hash, S: BuildHasher,`

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`impl<'a, T, S> FusedIterator for std::collections::hash_set::SymmetricDifference<'a, T, S> where T: Eq + Hash, S: BuildHasher,`

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`impl<'a, T, S> FusedIterator for std::collections::hash_set::Union<'a, T, S> where T: Eq + Hash, S: BuildHasher,`

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`impl<A> FusedIterator for Repeat<A> where A: Clone,`

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`impl<A> FusedIterator for std::ops::Range<A> where A: Step,`

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`impl<A> FusedIterator for RangeFrom<A> where A: Step,`

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`impl<A> FusedIterator for RangeInclusive<A> where A: Step,`

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`impl<A> FusedIterator for std::option::IntoIter<A>`

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`impl<A, B> FusedIterator for Chain<A, B> where A: FusedIterator, B: FusedIterator<Item = <A as Iterator>::Item>,`

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

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

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

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

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`impl<I> FusedIterator for Box<I> where I: FusedIterator + ?Sized,`

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

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

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

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`impl<I> FusedIterator for Peekable<I> where I: FusedIterator,`

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

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

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

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

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

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

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

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

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

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`impl<K> FusedIterator for std::collections::hash_set::IntoIter<K>`

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`impl<K, V> FusedIterator for std::collections::btree_map::IntoIter<K, V>`

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`impl<K, V> FusedIterator for std::collections::hash_map::IntoIter<K, V>`

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`impl<T> FusedIterator for std::collections::binary_heap::IntoIter<T>`

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`impl<T> FusedIterator for std::collections::btree_set::IntoIter<T>`

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`impl<T> FusedIterator for std::collections::linked_list::IntoIter<T>`

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`impl<T> FusedIterator for std::collections::vec_deque::IntoIter<T>`

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`impl<T> FusedIterator for Empty<T>`

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`impl<T> FusedIterator for Once<T>`

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`impl<T> FusedIterator for std::result::IntoIter<T>`

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`impl<T> FusedIterator for std::vec::IntoIter<T>`

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