TrkG4UserActions: thread-checker fixes (!58015) · Merge requests · atlas / athena · GitLab

Frank Winklmeier requested to merge fwinkl/athena:trkg4 into master Nov 01, 2022

remove unnecessary mutables
make IGeantFollower[MS]Helper interfaces non-const to avoid mutables
replace macro with constexpr

Relates to ATLASSIM-3561.