git subrepo clone git@github.com:Rconybea/xo-callback.git xo-callback

subrepo:
  subdir:   "xo-callback"
  merged:   "4e1849c7"
upstream:
  origin:   "git@github.com:Rconybea/xo-callback.git"
  branch:   "main"
  commit:   "4e1849c7"
git-subrepo:
  version:  "0.4.9"
  origin:   "???"
  commit:   "???"

xo-callback/src/callback/CallbackSet.cpp

@@ -0,0 +1,13 @@
+/* file CallbackSet.cpp
+ *
+ * author: Roland Conybeare, Sep 2022
+ */
+
+#include "CallbackSet.hpp"
+
+namespace xo {
+    namespace fn {
+    } /*namespace fn*/
+} /*namespace xo*/
+
+/* end CallbackSet.cpp */