Fix using DataHandles of types that are not collections with IOSvc #370

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jmcarcell wants to merge 1 commit into main from fix-datawrapper

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jmcarcell commented Dec 23, 2025

BEGINRELEASENOTES

Fix crash when running with IOSvc and DataHandles of types that are not collections.

ENDRELEASENOTES

An example is GenAlg: https://github.com/HEP-FCC/k4Gen/blob/main/k4Gen/src/components/GenAlg.h#L45 that will put a DataWrapper<HepMC3::GenEvent> in the store. This will crash because collectionBase() returns a nullptr when the type is not a collection: https://github.com/key4hep/k4FWCore/blob/fix-readhandle/k4FWCore/include/k4FWCore/DataWrapper.h#L86


          Fix using DataHandles of types that are not collections with IOSvc

9971e81

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