Trait core::iter::TrustedLen
[−]
[src]
pub unsafe trait TrustedLen: Iterator { }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.
The iterator must produce exactly the number of elements it reported.
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<usize>impl TrustedLen for Range<isize>impl TrustedLen for Range<u8>impl TrustedLen for Range<i8>impl TrustedLen for Range<u16>impl TrustedLen for Range<i16>impl TrustedLen for Range<u32>impl TrustedLen for Range<i32>impl TrustedLen for Range<i64>impl TrustedLen for Range<u64>impl TrustedLen for RangeInclusive<usize>impl TrustedLen for RangeInclusive<isize>impl TrustedLen for RangeInclusive<u8>impl TrustedLen for RangeInclusive<i8>impl TrustedLen for RangeInclusive<u16>impl TrustedLen for RangeInclusive<i16>impl TrustedLen for RangeInclusive<u32>impl TrustedLen for RangeInclusive<i32>impl TrustedLen for RangeInclusive<i64>impl TrustedLen for RangeInclusive<u64>impl<T> TrustedLen for Empty<T>impl<T> TrustedLen for Once<T>impl<'a, I: TrustedLen + ?Sized> TrustedLen for &'a mut Iimpl<I> TrustedLen for Rev<I> where
I: TrustedLen + DoubleEndedIterator,impl<'a, I, T: 'a> TrustedLen for Cloned<I> where
I: TrustedLen<Item = &'a T>,
T: Clone,impl<A, B> TrustedLen for Chain<A, B> where
A: TrustedLen,
B: TrustedLen<Item = A::Item>,impl<A, B> TrustedLen for Zip<A, B> where
A: TrustedLen,
B: TrustedLen,impl<B, I, F> TrustedLen for Map<I, F> where
I: TrustedLen,
F: FnMut(I::Item) -> B,impl<I> TrustedLen for Enumerate<I> where
I: TrustedLen,impl<'a, A> TrustedLen for core::option::Iter<'a, A>impl<'a, A> TrustedLen for core::option::IterMut<'a, A>impl<A> TrustedLen for core::option::IntoIter<A>impl<'a, A> TrustedLen for core::result::Iter<'a, A>impl<'a, A> TrustedLen for core::result::IterMut<'a, A>impl<A> TrustedLen for core::result::IntoIter<A>impl<'a, T> TrustedLen for core::slice::Iter<'a, T>impl<'a, T> TrustedLen for core::slice::IterMut<'a, T>impl<'a> TrustedLen for Bytes<'a>