GetClass() vs getClass() returns differents pointer

[damienmarchal]

It is unclear to me why GetClass() and getClass() are not returning the same pointer.
To me this indicate that there is two 'duplicated' BaseClass while only one is needed.

The side effect is that you cannot make class comparison by using BaseClass pointer comparison.

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[hugtalbot]

what about this @damienmarchal ? have you investigated further ?

[damienmarchal]

Yes, I reported that in the PR related to BaseClass refactoring.
To my understanding Sofa is "broken by design" on that aspect.

Broken because the code that create the class object is using template with inner static object to create a singleton. This means that in every .cpp, the templated functions are generated, but, as they have static object in them...they are actually different (which is a kind of ODR violation). This is not a real problem when all the corresponding .cpp are assembled in a single programe because the linker implements a mecanisme to detect "the duplicated templates instances" and pick one. But there is no such runtime "unification" when working with dynamically loaded shared libraries (plugin) which can cause a lot of troubles.

Changing that means refactoring the whole class introspection system.