Github user ajs6f commented on a diff in the pull request:
https://github.com/apache/jena/pull/337#discussion_r159261113
--- Diff: jena-base/src/main/java/org/apache/jena/atlas/lib/Pair.java ---
@@ -37,6 +40,30 @@
public A car() { return a ; }
public B cdr() { return b ; }
+ public static class OfSameType<T> extends Pair<T, T> {
+
--- End diff --
To be clear, it has to do with `Pair` insofar as it subclasses `Pair`. The
idea is to
1. restrict `Pair` to `Pair`s with both elements of the same type and
2. offer some convenience methods that only make sense when both halves of
a pair are the same type.
I've broken it out as a separate class, but I'm still up for turning it
into a couple of functions. I just don't want to do that until I understand
your third point better.
---
