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use crate::ops::Try;
#[unstable(feature = "std_internals", issue = "none")]
#[derive(Debug)]
pub struct ByRefSized<'a, I>(pub &'a mut I);
#[unstable(feature = "std_internals", issue = "none")]
impl<I: Iterator> Iterator for ByRefSized<'_, I> {
type Item = I::Item;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
self.0.next()
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.0.size_hint()
}
#[inline]
fn advance_by(&mut self, n: usize) -> Result<(), usize> {
self.0.advance_by(n)
}
#[inline]
fn nth(&mut self, n: usize) -> Option<Self::Item> {
self.0.nth(n)
}
#[inline]
fn fold<B, F>(self, init: B, f: F) -> B
where
F: FnMut(B, Self::Item) -> B,
{
self.0.fold(init, f)
}
#[inline]
fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R
where
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
{
self.0.try_fold(init, f)
}
}
#[unstable(feature = "std_internals", issue = "none")]
impl<I: DoubleEndedIterator> DoubleEndedIterator for ByRefSized<'_, I> {
#[inline]
fn next_back(&mut self) -> Option<Self::Item> {
self.0.next_back()
}
#[inline]
fn advance_back_by(&mut self, n: usize) -> Result<(), usize> {
self.0.advance_back_by(n)
}
#[inline]
fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
self.0.nth_back(n)
}
#[inline]
fn rfold<B, F>(self, init: B, f: F) -> B
where
F: FnMut(B, Self::Item) -> B,
{
self.0.rfold(init, f)
}
#[inline]
fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> R
where
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
{
self.0.try_rfold(init, f)
}
}