C++ Polymorphism with no inheritance is by no means, somewhat advanced concept. But, this is just because it is (in C++) based on different concepts v.s. some other good and popular languages where it is in the foundations of the language design.
I think I have architected, designed and implemented, what might be (a bit) better Factory Pattern. Of course, I am pretty sure someone else has discovered the same variation.
Of all the patterns, very often, I was particularly bothered with “classical” aka legacy, Factory. Yes, once implemented, you can relatively easily make it create new “things”, but on the design and usability level, to me, it does not look very flexible and expandable.
Just how many times you have admitted to yourself it was rather foolish to think of globals in C++ as “a simple thing” 🙂 After all: What could possibly go wrong? If you know what I am talking about please proceed.
As it turns out many things can and will go wrong, with what you think of as C++ global variables and functions. I am sure every now and then, you are wondering why is this singleton not a singleton, why is this function called more than once, and how it is, that nobody seems to care?
After many years of various coding idioms, that handle static linkage and global variables, and the famous “Singleton Pattern” implementations, may I be so bold to remind you: you do not have to dance around these issues any more.