egamma : Use std::array when the size is exactly known
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For the deltaEta,deltaPhi,deltaPhiRescaled we know the size == 4.
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Actually we were always resizing (not just reserve) to size 4 and not checking much afterwards
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Modify
egammaRecEvent/egammaRec.h
to this effect. -
Since I was touching it, move inline function inside an
.icc
since it fits better with the ATLAS style guidelines.
Had to do small changes in the 4 clients setting the deltaEta,deltaPhi,deltaPhiRescaled back to the xAODEgamma