include/interval_set: use map::rbegin() for accessing the last element

better than

p = end();
p--;

more concise this way.

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/include/interval_set.h b/src/include/interval_set.h
index 2b6ba05d709c6c96001b4ee2e4a264e302f935dc..3ade9acae1171d814c544e9a7066e853f7ae00a7 100644 (file)
--- a/src/include/interval_set.h
+++ b/src/include/interval_set.h
@@ -430,9 +430,8 @@ class interval_set {
   }
   offset_type range_end() const {
     ceph_assert(!empty());
-    auto p = m.end();
-    p--;
-    return p->first+p->second;
+    auto p = m.rbegin();
+    return p->first + p->second;
   }
 
   // interval start after p (where p not in set)