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#include "DataFormats/Common/interface/setIsMergeable.h"
#include "DataFormats/Common/interface/WrapperBase.h"
#include "DataFormats/Provenance/interface/ProductDescription.h"
#include "FWCore/Utilities/interface/BranchType.h"
#include "FWCore/Utilities/interface/getAnyPtr.h"
#include "TClass.h"
#include <memory>
namespace edm {
void setIsMergeable(ProductDescription& desc) {
// Save some time here with the knowledge that the isMergeable
// data member can only be true for run or lumi products.
// It defaults to false. Also if it is true that means it
// was already set.
// Set it only for branches that are present
if (desc.present() and (desc.branchType() == InRun or desc.branchType() == InLumi)) {
if (!desc.isMergeable()) {
TClass* wrapperBaseTClass = TypeWithDict::byName("edm::WrapperBase").getClass();
TClass* tClass = desc.wrappedType().getClass();
void* p = tClass->New();
int offset = tClass->GetBaseClassOffset(wrapperBaseTClass);
std::unique_ptr<WrapperBase> wrapperBase = getAnyPtr<WrapperBase>(p, offset);
if (wrapperBase->isMergeable()) {
desc.setIsMergeable(true);
}
}
}
}
} // namespace edm
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