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use std::borrow::Borrow; use std::rc::Rc; struct PStackEntry<T> { value: T, down: PStack<T>, } pub struct PStack<T>(Rc<Option<PStackEntry<T>>>); impl<T> PStack<T> { pub fn iter<'a>(&'a self) -> Iter<'a, T> { Iter(self) } } pub struct Iter<'a, T>(&'a PStack<T>); impl<'a, T> Iterator for Iter<'a, T> { type Item = &'a T; fn next(&mut self) -> Option<Self::Item> { match self.0.0.borrow() { None => None, Some(entry) => { self.0 = &entry.down; Some(&entry.value) } } } }
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