modify clustering to use the latest components

benchmarks/clustering/scripts/barrel_clusters.cxx

@@ -39,6 +39,13 @@ auto pt = [](std::vector<dd4pod::Geant4ParticleData> const& in) {
   }
   return result;
 };
+auto pid = [](ROOT::VecOps::RVec<dd4pod::Geant4ParticleData> const& in) {
+  std::vector<int> result;
+  for (size_t i = 0; i < in.size(); ++i) {
+    result.push_back(in[i].pdgID);
+  }
+  return result;
+};
 auto eta = [](ROOT::VecOps::RVec<dd4pod::Geant4ParticleData> const& in) {
   std::vector<float> result;
   ROOT::Math::PxPyPzMVector lv;
@@ -79,7 +86,7 @@ auto delta_E = [](std::vector<ROOT::Math::PxPyPzMVector> const& thrown, const st
 };
 
 
-void barrel_clusters(const char* in_fname = "topside/rec_barrel_clusters.root")
+int barrel_clusters(const char* in_fname = "topside/rec_barrel_clusters.root")
 {
   ROOT::EnableImplicitMT();
   ROOT::RDataFrame df("events", in_fname);