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Handle empty table when writing NanoAOD #37693

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Apr 26, 2022
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Handle empty table when writing NanoAOD #37693

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4 changes: 3 additions & 1 deletion PhysicsTools/NanoAOD/plugins/TableOutputBranches.h
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Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,9 @@ class TableOutputBranches {
int idx = tab.columnIndex(pair.name);
if (idx == -1)
throw cms::Exception("LogicError", "Missing column in input for " + m_baseName + "_" + pair.name);
pair.branch->SetAddress(const_cast<T *>(&tab.columnData<T>(idx).front())); // SetAddress should take a const * !
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front() returns a reference and should never be called if the container is empty.

pair.branch->SetAddress(
tab.size() == 0 ? static_cast<T *>(nullptr)
: const_cast<T *>(&tab.columnData<T>(idx).front())); // SetAddress should take a const * !
}
};

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