[][src]Trait std::iter::TrustedLen

pub unsafe trait TrustedLen: Iterator { }
🔬 This is a nightly-only experimental API. (trusted_len #37572)

An iterator that reports an accurate length using size_hint.

The iterator reports a size hint where it is either exact (lower bound is equal to upper bound), or the upper bound is None. The upper bound must only be None if the actual iterator length is larger than usize::MAX. In that case, the lower bound must be usize::MAX, resulting in a .size_hint of (usize::MAX, None).

The iterator must produce exactly the number of elements it reported or diverge before reaching the end.

Safety

This trait must only be implemented when the contract is upheld. Consumers of this trait must inspect .size_hint’s upper bound.

Implementors

impl TrustedLen for Range<i16>
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impl TrustedLen for Range<i32>
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impl TrustedLen for Range<i64>
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impl TrustedLen for Range<i8>
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impl TrustedLen for Range<isize>
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impl TrustedLen for Range<u16>
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impl TrustedLen for Range<u32>
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impl TrustedLen for Range<u64>
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impl TrustedLen for Range<u8>
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impl TrustedLen for Range<usize>
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impl TrustedLen for RangeInclusive<i16>
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impl TrustedLen for RangeInclusive<i32>
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impl TrustedLen for RangeInclusive<i64>
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impl TrustedLen for RangeInclusive<i8>
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impl TrustedLen for RangeInclusive<isize>
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impl TrustedLen for RangeInclusive<u16>
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impl TrustedLen for RangeInclusive<u32>
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impl TrustedLen for RangeInclusive<u64>
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impl TrustedLen for RangeInclusive<u8>
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impl TrustedLen for RangeInclusive<usize>
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impl<'a> TrustedLen for Bytes<'a>
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impl<'a, A> TrustedLen for std::option::Iter<'a, A>
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impl<'a, A> TrustedLen for std::option::IterMut<'a, A>
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impl<'a, A> TrustedLen for std::result::Iter<'a, A>
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impl<'a, A> TrustedLen for std::result::IterMut<'a, A>
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impl<'a, I> TrustedLen for &'a mut I where
    I: TrustedLen + ?Sized
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impl<'a, I, T> TrustedLen for Cloned<I> where
    I: TrustedLen<Item = &'a T>,
    T: 'a + Clone
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impl<'a, T> TrustedLen for Chunks<'a, T>
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impl<'a, T> TrustedLen for ChunksMut<'a, T>
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impl<'a, T> TrustedLen for ExactChunks<'a, T>
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impl<'a, T> TrustedLen for ExactChunksMut<'a, T>
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impl<'a, T> TrustedLen for std::slice::Iter<'a, T>
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impl<'a, T> TrustedLen for std::slice::IterMut<'a, T>
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impl<'a, T> TrustedLen for Windows<'a, T>
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impl<A> TrustedLen for Repeat<A> where
    A: Clone
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impl<A> TrustedLen for RangeFrom<A> where
    A: Step
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impl<A> TrustedLen for std::option::IntoIter<A>
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impl<A> TrustedLen for std::result::IntoIter<A>
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impl<A, B> TrustedLen for Chain<A, B> where
    A: TrustedLen,
    B: TrustedLen<Item = <A as Iterator>::Item>, 
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impl<A, B> TrustedLen for Zip<A, B> where
    A: TrustedLen,
    B: TrustedLen
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impl<A, F> TrustedLen for RepeatWith<F> where
    F: FnMut() -> A, 
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impl<B, I, F> TrustedLen for Map<I, F> where
    F: FnMut(<I as Iterator>::Item) -> B,
    I: TrustedLen
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impl<I> TrustedLen for Enumerate<I> where
    I: TrustedLen
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impl<I> TrustedLen for Rev<I> where
    I: TrustedLen + DoubleEndedIterator
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impl<I> TrustedLen for Take<I> where
    I: TrustedLen
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impl<T> TrustedLen for Empty<T>
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impl<T> TrustedLen for Once<T>
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impl<T> TrustedLen for std::vec::IntoIter<T>
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