Function iter_set::symmetric_difference_by_key

pub fn symmetric_difference_by_key<T, L, R, K, F>(
    a: L, 
    b: R, 
    key: F
) -> impl Iterator<Item = T> where
    L: IntoIterator<Item = T>,
    R: IntoIterator<Item = T>,
    K: Ord,
    F: FnMut(&T) -> K, 

Take the symmetric_difference of two sets represented by sorted, deduplicated iterators, using a key extraction function.

See symmetric_difference.