[PWGCF] Fix MC only processing (#16888)

Author: ariedel-cern

PWGCF/Femto/Core/mcBuilder.h

@@ -184,16 +184,19 @@ class McBuilder
   void fillMcCollision(T1 const& mcCol, T2& mcProducts)
   {
     float centrality = -1;
+    float multiplicity = -1;
     if constexpr (modes::isFlagSet(system, modes::System::kPP)) {
       centrality = mcCol.centFT0M();
+      multiplicity = mcCol.multMCNParticlesEta08();
     }
     if constexpr (modes::isFlagSet(system, modes::System::kPbPb)) {
       centrality = mcCol.centFT0C();
+      multiplicity = mcCol.multMCNParticlesEta08();
     }
 
     mcProducts.producedMcCollisions(
       mcCol.posZ(),
-      mcCol.multMCNParticlesEta08(),
+      multiplicity,
       centrality);
     mCollisionMap.emplace(mcCol.globalIndex(), mcProducts.producedMcCollisions.lastIndex());
   }

PWGCF/Femto/TableProducer/femtoProducer.cxx

@@ -166,7 +166,7 @@ struct FemtoProducer {
         (!doprocessTracksV0sRun3ppMc && !doprocessTracksKinksRun3ppMc &&
          !doprocessTracksV0sCascadesRun3ppMc && !doprocessTracksV0sKinksRun3ppMc &&
          !doprocessTracksRun3ppMc && !doprocessTracksRun3PbPbMc && !doprocessTracksV0sRun3PbPbMc &&
-         !doprocessRun3ppMcOnly)) {
+         !doprocessMcOnly)) {
       LOG(fatal) << "At least one mc table is enabled, but wrong process function is enabled. Breaking...";
     }
 
@@ -531,18 +531,18 @@ struct FemtoProducer {
 
   // process generator level only input (for MCGEN datasets)
   // do not preslice mcParticles tables for each collision, otherwise the finding of the partonic mother can fail
-  void processRun3ppMcOnly(consumeddata::Run3PpMcGenCollisions const& mcCols, consumeddata::Run3McGenParticles const& mcParticles)
+  void processMcOnly(o2::aod::McCollisions const& mcCols, o2::aod::McParticles const& mcParticles)
   {
     mcBuilder.reset(mcParticles);
     for (const auto& mcCol : mcCols) {
-      mcBuilder.fillMcCollision<modes::System::kPP_Run3_MC>(mcCol, mcProducts);
+      mcBuilder.fillMcCollision<modes::System::kMC>(mcCol, mcProducts);
       auto particlesThisCollision = mcParticles.sliceBy(perMcCollision, mcCol.globalIndex());
       for (const auto& mcParticle : particlesThisCollision) {
-        mcBuilder.fillMcParticle<modes::System::kPP_Run3_MC>(mcParticle, mcParticles, mcCol, mcProducts);
+        mcBuilder.fillMcParticle<modes::System::kMC>(mcParticle, mcParticles, mcCol, mcProducts);
       }
     }
   }
-  PROCESS_SWITCH(FemtoProducer, processRun3ppMcOnly, "Provide generated particles", false);
+  PROCESS_SWITCH(FemtoProducer, processMcOnly, "Provide generated particles", false);
 };
 
 o2::framework::WorkflowSpec defineDataProcessing(o2::framework::ConfigContext const& cfgc)