use std::iter::IntoIterator;
use std::rc::Rc;
use std::cell::RefCell;
#[derive(Debug)]
pub struct RcIter<I> {
pub rciter: Rc<RefCell<I>>,
}
pub fn rciter<I>(iterable: I) -> RcIter<I::IntoIter>
where I: IntoIterator
{
RcIter { rciter: Rc::new(RefCell::new(iterable.into_iter())) }
}
impl<I> Clone for RcIter<I> {
#[inline]
clone_fields!(rciter);
}
impl<A, I> Iterator for RcIter<I>
where I: Iterator<Item = A>
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
self.rciter.borrow_mut().next()
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let (_, hi) = self.rciter.borrow().size_hint();
(0, hi)
}
}
impl<I> DoubleEndedIterator for RcIter<I>
where I: DoubleEndedIterator
{
#[inline]
fn next_back(&mut self) -> Option<I::Item> {
self.rciter.borrow_mut().next_back()
}
}
impl<'a, I> IntoIterator for &'a RcIter<I>
where I: Iterator
{
type Item = I::Item;
type IntoIter = RcIter<I>;
fn into_iter(self) -> RcIter<I> {
self.clone()
}
}