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    Great answer. This is the kind of thing I was looking for. Commented Feb 14, 2013 at 16:31
  • @AndyProwl What about to combine in one namespace - class and friend functions? Friend fuctions are non-members then they give better encapsulation than static member functions. Scott Meyers recommends non-member functions in Item 23. And here: cpptips.com/nmemfunc_encap Commented Aug 7, 2018 at 9:11