Trait nom::lib::std::iter::TrustedLen
[−]
[src]
pub unsafe trait TrustedLen: Iterator { }
🔬 This is a nightly-only experimental API. (
trusted_len
)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.
Implementations on Foreign Types
impl<'a, I> TrustedLen for &'a mut I where
I: TrustedLen + ?Sized,
[src]
I: TrustedLen + ?Sized,
Implementors
impl TrustedLen for Range<u8>
impl TrustedLen for Range<i8>
impl<B, I, F> TrustedLen for Map<I, F> where
F: FnMut(<I as Iterator>::Item) -> B,
I: TrustedLen,impl TrustedLen for RangeInclusive<i8>
impl TrustedLen for RangeInclusive<usize>
impl<'a, T> TrustedLen for nom::lib::std::slice::IterMut<'a, T>
impl TrustedLen for Range<u64>
impl<A, B> TrustedLen for Zip<A, B> where
A: TrustedLen,
B: TrustedLen,impl<'a, A> TrustedLen for nom::lib::std::result::Iter<'a, A>
impl<'a, A> TrustedLen for nom::lib::std::option::Iter<'a, A>
impl<'a, T> TrustedLen for nom::lib::std::slice::Iter<'a, T>
impl<A> TrustedLen for Repeat<A> where
A: Clone,impl TrustedLen for RangeInclusive<i32>
impl TrustedLen for RangeInclusive<u16>
impl<A, F> TrustedLen for RepeatWith<F> where
F: FnMut() -> A,impl<A, B> TrustedLen for Chain<A, B> where
A: TrustedLen,
B: TrustedLen<Item = <A as Iterator>::Item>,impl<I> TrustedLen for Enumerate<I> where
I: TrustedLen,impl<I> TrustedLen for Rev<I> where
I: TrustedLen + DoubleEndedIterator,impl TrustedLen for Range<usize>
impl<'a, A> TrustedLen for nom::lib::std::option::IterMut<'a, A>
impl TrustedLen for RangeInclusive<u64>
impl<'a, I, T> TrustedLen for Cloned<I> where
I: TrustedLen<Item = &'a T>,
T: 'a + Clone,impl TrustedLen for RangeInclusive<u8>
impl TrustedLen for RangeInclusive<i64>
impl TrustedLen for RangeInclusive<isize>
impl<A> TrustedLen for nom::lib::std::option::IntoIter<A>
impl TrustedLen for RangeInclusive<i16>
impl TrustedLen for RangeInclusive<u32>
impl TrustedLen for Range<u16>
impl TrustedLen for Range<i32>
impl TrustedLen for Range<u32>
impl<A> TrustedLen for nom::lib::std::result::IntoIter<A>
impl TrustedLen for Range<i16>
impl<I> TrustedLen for Take<I> where
I: TrustedLen,impl<A> TrustedLen for RangeFrom<A> where
A: Step,impl<'a, A> TrustedLen for nom::lib::std::result::IterMut<'a, A>
impl<T> TrustedLen for Empty<T>
impl<'a> TrustedLen for Bytes<'a>
impl TrustedLen for Range<isize>
impl TrustedLen for Range<i64>
impl<T> TrustedLen for Once<T>
impl<T> TrustedLen for nom::lib::std::vec::IntoIter<T>