Should I prefer private member functions, or functions in an unnamed namespace? [duplicate]

In the semi large projects where I usually work (more than 2 million lines of code) I would ban private class functions if I could. The reason being that a private class function is private but yet it’s visible in the header file. This means if I change the signature (or the comment) in anyway I’m rewarded sometimes with a full recompile which costs several minutes (or hours depending on the project).

Just say no to that and hide what’s private in the cpp file.

If I would start fresh on a large c++ project I would enforce PIMPL Idiom: to move even more private details into the cpp file.

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