Reference particle #2187
Reference particle #2187
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REQUEST FOR PRODUCTION RELEASES: This will add The following labels are available |
| auto nparticles = T::mParticles.size(); | ||
| for (Int_t iparticle = 0; iparticle < nparticles; ++iparticle) { | ||
| auto particle = (TParticle)T::mParticles.at(iparticle); | ||
| const auto& particle = T::mParticles.at(iparticle); |
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Good if it works... but I don't see where this should make a difference.
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It makes a difference only in the log messages. By using the copy the Jpsi will have no daughters before and after the decay because we're not referring to the particle in the stack. By taking a reference instead we see that as expected the Jpsi has no daughters before decay (turned off by a cfg switch), but it does after.
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Yes I understand the difference in outcome but I don't understand why it should matter on the technical side. Clearly the copy constructor of TParticle must then be doing something weird.
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Particle was copied, not referenced, causing logging issue as reported here: https://its.cern.ch/jira/browse/O2-6485