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Fix Header info forwarding #15068

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Merged
sawenzel merged 1 commit into from
Feb 13, 2026
+8 −3
Merged

Fix Header info forwarding #15068

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11 changes: 8 additions & 3 deletions Generators/src/GeneratorHybrid.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -420,6 +420,7 @@ bool GeneratorHybrid::importParticles()
mMCEventHeader.clearInfo();
if (mCocktailMode) {
// in cocktail mode we need to merge the particles from the different generators
bool baseGen = true; // first generator of the cocktail is used as reference to update the event header information
for (auto subIndex : subGenIndex) {
LOG(info) << "Importing particles for task " << subIndex;
auto subParticles = gens[subIndex]->getParticles();
Expand All @@ -441,8 +442,10 @@ bool GeneratorHybrid::importParticles()
}

mParticles.insert(mParticles.end(), subParticles.begin(), subParticles.end());
// fetch the event Header information from the underlying generator
gens[subIndex]->updateHeader(&mMCEventHeader);
if (baseGen) {
gens[subIndex]->updateHeader(&mMCEventHeader);
baseGen = false;
}
mInputTaskQueue.push(subIndex);
mTasksStarted++;
}
Expand Down Expand Up @@ -481,7 +484,9 @@ bool GeneratorHybrid::importParticles()
void GeneratorHybrid::updateHeader(o2::dataformats::MCEventHeader* eventHeader)
{
if (eventHeader) {
// we forward the original header information if any
// Forward the base class fields from FairMCEventHeader
static_cast<FairMCEventHeader&>(*eventHeader) = static_cast<FairMCEventHeader&>(mMCEventHeader);
// Copy the key-value store info
eventHeader->copyInfoFrom(mMCEventHeader);

// put additional information about
Expand Down