Fix visithierarchy

Author: franzpoeschel

include/openPMD/backend/BaseRecord.hpp

@@ -366,6 +366,16 @@ class BaseRecord
      */
     bool scalar() const;
 
+    template <typename Visitor>
+    void visitHierarchy(Visitor &&v)
+    {
+        v(*this);
+        for (auto &p : *this)
+        {
+            p.second.visitHierarchy(v);
+        }
+    }
+
 private:
     void flush(std::string const &, internal::FlushParams const &) final;
     virtual void

include/openPMD/backend/Container.hpp

@@ -268,7 +268,7 @@ class Container : virtual public Attributable
         v(*this);
         for (auto &p : *this)
         {
-            p.second.visitHierarchy();
+            p.second.visitHierarchy(v);
         }
     }