pub struct OptionIterator<A> {
priv opt: Option<A>,
}An iterator that yields either one or zero elements
impl<A: Clone> Clone for OptionIterator<A>fn clone(&self) -> OptionIterator<A>Returns a copy of the value. The contents of owned pointers are copied to maintain uniqueness, while the contents of managed pointers are not copied.
impl<A: DeepClone> DeepClone for OptionIterator<A>fn deep_clone(&self) -> OptionIterator<A>Return a deep copy of the value. Unlike Clone, the contents of shared pointer types
are copied.
impl<A> Iterator<A> for OptionIterator<A>fn next(&mut self) -> Option<A>Advance the iterator and return the next value. Return None when the end is reached.
fn size_hint(&self) -> (uint, Option<uint>)Return a lower bound and upper bound on the remaining length of the iterator.
The common use case for the estimate is pre-allocating space to store the results.
impl<A> DoubleEndedIterator<A> for OptionIterator<A>fn next_back(&mut self) -> Option<A>Yield an element from the end of the range, returning None if the range is empty.
impl<A> ExactSize<A> for OptionIterator<A>
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