Trait std::iter::FusedIterator
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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 is 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
impl<I> FusedIterator for Box<I> where
I: FusedIterator + ?Sized,impl FusedIterator for ToLowercaseimpl<'a> FusedIterator for SplitWhitespace<'a>impl<I> FusedIterator for Utf16Encoder<I> where
I: FusedIterator<Item = char>,impl FusedIterator for ToUppercaseimpl<T> FusedIterator for std::collections::linked_list::IntoIter<T>impl<'a, T> FusedIterator for std::collections::linked_list::Iter<'a, T>impl<'a, K, V> FusedIterator for std::collections::btree_map::ValuesMut<'a, K, V>impl<'a, T> FusedIterator for std::collections::binary_heap::Drain<'a, T> where
T: 'a,impl<'a, K, V> FusedIterator for RangeMut<'a, K, V>impl<'a, T> FusedIterator for std::collections::btree_set::Union<'a, T> where
T: Ord,impl<'a, T> FusedIterator for std::collections::vec_deque::IterMut<'a, T>impl<T> FusedIterator for std::collections::vec_deque::IntoIter<T>impl<'a, T> FusedIterator for std::vec::Drain<'a, T>impl<'a, T> FusedIterator for std::collections::btree_set::Difference<'a, T> where
T: Ord,impl<'a, T> FusedIterator for std::collections::vec_deque::Drain<'a, T> where
T: 'a,impl<'a, T> FusedIterator for std::collections::btree_set::Iter<'a, T>impl<'a, T> FusedIterator for std::collections::btree_set::SymmetricDifference<'a, T> where
T: Ord,impl<'a, T> FusedIterator for std::collections::linked_list::IterMut<'a, T>impl<K, V> FusedIterator for std::collections::btree_map::IntoIter<K, V>impl<'a, K, V> FusedIterator for std::collections::btree_map::Iter<'a, K, V>impl<'a, K, V> FusedIterator for std::collections::btree_map::Values<'a, K, V>impl<'a, K, V> FusedIterator for std::collections::btree_map::IterMut<'a, K, V>impl<'a> FusedIterator for std::string::Drain<'a>impl<T> FusedIterator for std::vec::IntoIter<T>impl<'a, T> FusedIterator for std::collections::btree_set::Intersection<'a, T> where
T: Ord,impl<T> FusedIterator for std::collections::binary_heap::IntoIter<T>impl<'a, T> FusedIterator for std::collections::binary_heap::Iter<'a, T>impl<'a, K, V> FusedIterator for std::collections::btree_map::Keys<'a, K, V>impl<'a, K, V> FusedIterator for std::collections::btree_map::Range<'a, K, V>impl<T> FusedIterator for std::collections::btree_set::IntoIter<T>impl<'a, T> FusedIterator for std::collections::btree_set::Range<'a, T>impl<'a> FusedIterator for EncodeUtf16<'a>impl<'a, T> FusedIterator for std::collections::vec_deque::Iter<'a, T>impl<I> FusedIterator for Take<I> where
I: FusedIterator,impl<'a, T, P> FusedIterator for RSplitMut<'a, T, P> where
P: FnMut(&T) -> bool,impl<'a, A> FusedIterator for std::option::IterMut<'a, A>impl<'a, P> FusedIterator for RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,impl<'a, T, P> FusedIterator for RSplitNMut<'a, T, P> where
P: FnMut(&T) -> bool,impl<'a> FusedIterator for Bytes<'a>impl<I> FusedIterator for Cycle<I> where
I: Clone + Iterator,impl FusedIterator for std::char::EscapeDefaultimpl<I, P> FusedIterator for TakeWhile<I, P> where
I: FusedIterator,
P: FnMut(&<I as Iterator>::Item) -> bool,impl<'a, T> FusedIterator for std::slice::IterMut<'a, T>impl<I> FusedIterator for Peekable<I> where
I: FusedIterator,impl<'a> FusedIterator for Chars<'a>impl<'a, P> FusedIterator for std::str::RSplit<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,impl<A> FusedIterator for StepBy<A, RangeInclusive<A>> where
A: Clone + Step,impl<'a, T, P> FusedIterator for std::slice::SplitN<'a, T, P> where
P: FnMut(&T) -> bool,impl<'a, P> FusedIterator for Matches<'a, P> where
P: Pattern<'a>,impl<A> FusedIterator for RangeFrom<A> where
A: Step,
&'a A: Add<&'a A>,
<&'a A as Add<&'a A>>::Output == A,impl<'a, I> FusedIterator for &'a mut I where
I: FusedIterator + ?Sized,impl<I> FusedIterator for DecodeUtf8<I> where
I: FusedIterator<Item = u8>,impl<A, B> FusedIterator for Zip<A, B> where
A: FusedIterator,
B: FusedIterator,impl<A> FusedIterator for Repeat<A> where
A: Clone,impl<'a, P> FusedIterator for std::str::RSplitN<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,impl<I> FusedIterator for Rev<I> where
I: FusedIterator + DoubleEndedIterator,impl<'a> FusedIterator for LinesAny<'a>impl<I, P> FusedIterator for Filter<I, P> where
I: FusedIterator,
P: FnMut(&<I as Iterator>::Item) -> bool,impl<'a, T, P> FusedIterator for std::slice::RSplitN<'a, T, P> where
P: FnMut(&T) -> bool,impl<A> FusedIterator for std::ops::Range<A> where
A: Step,
&'a A: Add<&'a A>,
<&'a A as Add<&'a A>>::Output == A,impl<'a, P> FusedIterator for std::str::SplitN<'a, P> where
P: Pattern<'a>,impl<I, U, F> FusedIterator for FlatMap<I, U, F> where
F: FnMut(<I as Iterator>::Item) -> U,
I: FusedIterator,
U: IntoIterator,impl<A> FusedIterator for RangeInclusive<A> where
A: Step,
&'a A: Add<&'a A>,
<&'a A as Add<&'a A>>::Output == A,impl<I> FusedIterator for Skip<I> where
I: FusedIterator,impl<A> FusedIterator for StepBy<A, Range<A>> where
A: Clone + Step,impl<'a, P> FusedIterator for RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,impl<B, I, F> FusedIterator for Map<I, F> where
F: FnMut(<I as Iterator>::Item) -> B,
I: FusedIterator,impl<'a, T, P> FusedIterator for std::slice::RSplit<'a, T, P> where
P: FnMut(&T) -> bool,impl<I> FusedIterator for Enumerate<I> where
I: FusedIterator,impl FusedIterator for EscapeDebugimpl<T> FusedIterator for Empty<T>impl<T> FusedIterator for Once<T>impl<'a> FusedIterator for CharIndices<'a>impl<'a, A> FusedIterator for std::option::Iter<'a, A>impl FusedIterator for EscapeUnicodeimpl<'a, T> FusedIterator for ChunksMut<'a, T>impl<A, B> FusedIterator for Chain<A, B> where
A: FusedIterator,
B: FusedIterator<Item = <A as Iterator>::Item>,impl<'a, P> FusedIterator for SplitTerminator<'a, P> where
P: Pattern<'a>,impl<'a, P> FusedIterator for RMatches<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,impl<I> FusedIterator for Fuse<I> where
I: Iterator,impl<'a, P> FusedIterator for MatchIndices<'a, P> where
P: Pattern<'a>,impl<'a, T, P> FusedIterator for SplitMut<'a, T, P> where
P: FnMut(&T) -> bool,impl<'a, T, P> FusedIterator for SplitNMut<'a, T, P> where
P: FnMut(&T) -> bool,impl<A> FusedIterator for std::option::IntoIter<A>impl<'a, P> FusedIterator for std::str::Split<'a, P> where
P: Pattern<'a>,impl<'a> FusedIterator for Lines<'a>impl<'a, T> FusedIterator for std::slice::Iter<'a, T>impl<'a, T> FusedIterator for std::result::IterMut<'a, T>impl<B, I, F> FusedIterator for FilterMap<I, F> where
F: FnMut(<I as Iterator>::Item) -> Option<B>,
I: FusedIterator,impl<I, F> FusedIterator for Inspect<I, F> where
F: FnMut(&<I as Iterator>::Item) -> (),
I: FusedIterator,impl<'a, I, T> FusedIterator for Cloned<I> where
I: FusedIterator<Item = &'a T>,
T: 'a + Clone,impl<'a, T> FusedIterator for std::result::Iter<'a, T>impl<I, P> FusedIterator for SkipWhile<I, P> where
I: FusedIterator,
P: FnMut(&<I as Iterator>::Item) -> bool,impl<'a, T> FusedIterator for Chunks<'a, T>impl<'a, T> FusedIterator for Windows<'a, T>impl<A> FusedIterator for StepBy<A, RangeFrom<A>> where
A: Clone,
&'a A: Add<&'a A>,
<&'a A as Add<&'a A>>::Output == A,impl<'a, T, P> FusedIterator for std::slice::Split<'a, T, P> where
P: FnMut(&T) -> bool,impl<T> FusedIterator for std::result::IntoIter<T>impl FusedIterator for std::ascii::EscapeDefaultimpl<'a, K, V> FusedIterator for std::collections::hash_map::Iter<'a, K, V>impl<'a, K, V> FusedIterator for std::collections::hash_map::IterMut<'a, K, V>impl<K, V> FusedIterator for std::collections::hash_map::IntoIter<K, V>impl<'a, K, V> FusedIterator for std::collections::hash_map::Keys<'a, K, V>impl<'a, K, V> FusedIterator for std::collections::hash_map::Values<'a, K, V>impl<'a, K, V> FusedIterator for std::collections::hash_map::ValuesMut<'a, K, V>impl<'a, K, V> FusedIterator for std::collections::hash_map::Drain<'a, K, V>impl<'a, K> FusedIterator for std::collections::hash_set::Iter<'a, K>impl<K> FusedIterator for std::collections::hash_set::IntoIter<K>impl<'a, K> FusedIterator for std::collections::hash_set::Drain<'a, K>impl<'a, T, S> FusedIterator for std::collections::hash_set::Intersection<'a, T, S> where
T: Eq + Hash,
S: BuildHasher,impl<'a, T, S> FusedIterator for std::collections::hash_set::Difference<'a, T, S> where
T: Eq + Hash,
S: BuildHasher,impl<'a, T, S> FusedIterator for std::collections::hash_set::SymmetricDifference<'a, T, S> where
T: Eq + Hash,
S: BuildHasher,impl<'a, T, S> FusedIterator for std::collections::hash_set::Union<'a, T, S> where
T: Eq + Hash,
S: BuildHasher,impl<'a> FusedIterator for std::path::Iter<'a>impl<'a> FusedIterator for Components<'a>