tree 2c7b060f1d6f7a7f0c6684c1e59e1adff9395433
parent 5e00a6c873981f87165adfecf29ad0ecc2c2c5df
author Michael Haggerty <mhagger@alum.mit.edu> 1505322955 +0200
committer Junio C Hamano <gitster@pobox.com> 1505369947 +0900

ref_iterator: keep track of whether the iterator output is ordered

References are iterated over in order by refname, but reflogs are not.
Some consumers of reference iteration care about the difference. Teach
each `ref_iterator` to keep track of whether its output is ordered.

`overlay_ref_iterator` is one of the picky consumers. Add a sanity
check in `overlay_ref_iterator_begin()` to verify that its inputs are
ordered.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>