D8204: Make parents and children Return References

[David Narváez]

narvaez created this revision.
narvaez added a reviewer: KDE Edu.

REVISION SUMMARY
  I will later use this to avoid some useless copy-on-assigns but this
  patch is just about the ObjectCalcer classes.

BRANCH
  object-calcer-member-ref

REVISION DETAIL
  https://phabricator.kde.org/D8204

AFFECTED FILES
  objects/object_calcer.cc
  objects/object_calcer.h

To: narvaez, #kde_edu
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