arrayset 3.1.1

An array-backed ordered set type.
Documentation 
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use core::iter::FusedIterator;

use super::{Compare, Item};

#[derive(Debug)]
pub struct SymmetricDifference<'a, T>(Compare<'a, T>);

impl<'a, T> SymmetricDifference<'a, T> {
    pub fn new(left: &'a [T], right: &'a [T]) -> Self {
        Self(Compare::new(left, right))
    }
}

impl<'a, T> Iterator for SymmetricDifference<'a, T>
where
    T: Ord,
{
    type Item = &'a T;

    fn next(&mut self) -> Option<Self::Item> {
        loop {
            match self.0.next() {
                Some(Item::Left(item) | Item::Right(item)) => return Some(item),
                Some(_) => (),
                None => return None,
            }
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        let left = self.0.left_len();
        let right = self.0.right_len();
        (left.abs_diff(right), left.checked_add(right))
    }
}

impl<'a, T> FusedIterator for SymmetricDifference<'a, T> where T: Ord {}