Make EDM4hep to LCIO conversion a template library

k4EDM4hep2LcioConv/CMakeLists.txt

@@ -12,9 +12,16 @@ target_link_libraries(k4EDM4hep2LcioConv PUBLIC
   ${LCIO_LIBRARIES}
   EDM4HEP::edm4hep)
 
+set(public_headers
+  include/${PROJECT_NAME}/k4EDM4hep2LcioConv.h
+  include/${PROJECT_NAME}/k4EDM4hep2LcioConv.ipp
+  include/${PROJECT_NAME}/k4Lcio2EDM4hepConv.h
+  include/${PROJECT_NAME}/MappingUtils.h
+)
+
 set_target_properties(${PROJECT_NAME}
   PROPERTIES
-  PUBLIC_HEADER "include/${PROJECT_NAME}/k4EDM4hep2LcioConv.h;include/${PROJECT_NAME}/k4Lcio2EDM4hepConv.h;include/${PROJECT_NAME}/MappingUtils.h"
+  PUBLIC_HEADER "${public_headers}"
   )
 
 install(TARGETS k4EDM4hep2LcioConv

k4EDM4hep2LcioConv/include/k4EDM4hep2LcioConv/k4EDM4hep2LcioConv.h

@@ -36,6 +36,20 @@ namespace edm4hep {
 #include <edm4hep/TrackerHitPlaneCollection.h>
 #include <edm4hep/VertexCollection.h>
 
+#if __has_include("edm4hep/EDM4hepVersion.h")
+#include "edm4hep/EDM4hepVersion.h"
+#else
+  // Copy the necessary parts from  the header above to make whatever we need to work here
+#define EDM4HEP_VERSION(major, minor, patch) ((UINT64_C(major) << 32) | (UINT64_C(minor) << 16) | (UINT64_C(patch)))
+  // v00-07-02 is the last version without that still has TPCHits
+#if __has_include("edm4hep/TPCHitCollection.h")
+#define EDM4HEP_BUILD_VERSION EDM4HEP_VERSION(0, 7, 2)
+#else
+// v00-09 is the last version without the capitalization change of the track vector members
+#define EDM4HEP_BUILD_VERSION EDM4HEP_VERSION(0, 9, 0)
+#endif
+#endif
+
 // LCIO
 #include <IMPL/CalorimeterHitImpl.h>
 #include <IMPL/ClusterImpl.h>
@@ -168,4 +182,6 @@ namespace EDM4hep2LCIOConv {
 
 } // namespace EDM4hep2LCIOConv
 
+#include "k4EDM4hep2LcioConv/k4EDM4hep2LcioConv.ipp"
+
 #endif