Private class functions vs Functions in unnamed namespace

Question

I\'ve found myself that I tend not to have private class functions. If possible, all candidates to private class function rather I put in to unnamed namespace and pass all n

Answer 1

I've done this in the past, and it has always ended badly. You cannot pass class objects to the functions, as they need to access the private members, presumably by reference (or you end up with convoluted parameter lists) so you cannot call public class methods. And you can't call virtual functions, for the same reason. I strongly believe (based on experience) that this is A Bad Idea.

Bottom line: This sounds like the kind of idea that might work where the implementation "module" has some special access to the class, but this is not the case in C++.