From b62c193a37ef9c244d092a7fbbbe9ce087ccaa5e Mon Sep 17 00:00:00 2001
From: tmadlener <thomas.madlener@desy.de>
Date: Tue, 12 Sep 2023 13:47:56 +0200
Subject: [PATCH] Introduce preprocessor symbol for more gradual transition

---
 .../include/k4EDM4hep2LcioConv/k4EDM4hep2LcioConv.h           | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/k4EDM4hep2LcioConv/include/k4EDM4hep2LcioConv/k4EDM4hep2LcioConv.h b/k4EDM4hep2LcioConv/include/k4EDM4hep2LcioConv/k4EDM4hep2LcioConv.h
index 7118309b..1a896007 100644
--- a/k4EDM4hep2LcioConv/include/k4EDM4hep2LcioConv/k4EDM4hep2LcioConv.h
+++ b/k4EDM4hep2LcioConv/include/k4EDM4hep2LcioConv/k4EDM4hep2LcioConv.h
@@ -57,6 +57,10 @@ namespace edm4hep {
 #include <UTIL/CellIDEncoder.h>
 #include <lcio.h>
 
+// Preprocessor symbol that can be used in downstream code to switch on the
+// namespace for the conversion
+#define EDM4HEP2LCIOCONV_NAMESPACE 1
+
 namespace EDM4hep2LCIOConv {
 
   template<typename T1, typename T2>