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