From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Thu, 19 Sep 2019 16:41:19 +0000 (+0200)
Subject: Add comment about an if
X-Git-Tag: v9.2.0-rc1~1073^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F8800%2Fhead;p=dealii.git

Add comment about an if
---

diff --git a/include/deal.II/base/index_set.h b/include/deal.II/base/index_set.h
index f4e6dfe24a..ef6a55d575 100644
--- a/include/deal.II/base/index_set.h
+++ b/include/deal.II/base/index_set.h
@@ -1693,6 +1693,11 @@ IndexSet::add_indices(const ForwardIterator &begin, const ForwardIterator &end)
 
       tmp_ranges.emplace_back(begin_index, end_index);
       p = q;
+
+      // if the starting index of the next go-around of the for loop is less
+      // than the end index of the one just identified, then we will have at
+      // least one pair of ranges that are not sorted, and consequently the
+      // whole collection of ranges is not sorted.
       if (p != end && *p < end_index)
         ranges_are_sorted = false;
     }