Trait std::iter::TrustedLen
[−]
[src]
pub unsafe trait TrustedLen: Iterator { }
Unstable (
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
.
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<T> TrustedLen for IntoIter<T>
impl<'a, I> TrustedLen for &'a mut I where I: TrustedLen + ?Sized
impl<I> TrustedLen for Rev<I> where I: TrustedLen + DoubleEndedIterator
impl<'a, I, T> TrustedLen for Cloned<I> where I: TrustedLen<Item=&'a T>, T: 'a + 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 F: FnMut(I::Item) -> B, I: TrustedLen
impl<I> TrustedLen for Enumerate<I> where I: TrustedLen
impl<'a, A> TrustedLen for Iter<'a, A>
impl<'a, A> TrustedLen for IterMut<'a, A>
impl<A> TrustedLen for IntoIter<A>
impl<'a, A> TrustedLen for Iter<'a, A>
impl<'a, A> TrustedLen for IterMut<'a, A>
impl<A> TrustedLen for IntoIter<A>
impl<'a, T> TrustedLen for Iter<'a, T>
impl<'a, T> TrustedLen for IterMut<'a, T>
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>