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Avoid operators in the global namespace

Gerhard Raven requested to merge do-not-dump-functions-in-global-namespace-when-that-is-not-necessary into master

Avoid putting operators with MuonLayout as argument(s) in the global namespace

  • instead, make them 'hidden friends' and let ADL do its job
  • this avoids getting long error messages of possible overloads that are available, but not applicable if you write any code which uses '==', '!=' or '<<' using types for which those operators are not yet defined...
Edited by Rosen Matev

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