pub fn merge_join_by<I, J, F, T>(
    left: I,
    right: J,
    cmp_fn: F
) -> MergeJoinBy<<I as IntoIterator>::IntoIter, <J as IntoIterator>::IntoIter, F> 
where I: IntoIterator, J: IntoIterator, F: FnMut(&<I as IntoIterator>::Item, &<J as IntoIterator>::Item) -> T, T: OrderingOrBool<<I as IntoIterator>::Item, <J as IntoIterator>::Item>,
Expand description

Return an iterator adaptor that merge-joins items from the two base iterators in ascending order.

IntoIterator enabled version of [Itertools::merge_join_by].