'**' at the end of a pattern matches everything

src/dds/util/glob.cpp

     } else {
         // An rglob pattern "**". Check by peeling of individual path elements
         const auto next_pat = std::next(pat_it);
+        if (next_pat == pat_stop) {
+            // The "**" is at the end of the glob. This matches everything.
+            return true;
+        }
         for (; elem_it != elem_stop; ++elem_it) {
             if (check_matches(elem_it, elem_stop, next_pat, pat_stop)) {
                 return true;

src/dds/util/glob.test.cpp

     CHECK(glob.match("foo/thing/bar/thing/baz.txt"));
     CHECK(glob.match("foo/bar/thing/baz.txt"));
     CHECK(glob.match("foo/bar/baz/baz.txt"));
+
+    glob = dds::glob::compile("doc/**");
+    CHECK(glob.match("doc/something.txt"));
 }