How to do the equivalent of a ProArray containing element which are a ProArray of double with sequences ?
I don't understand your question. Do you want to push sequences of doubles inside a ProArray structure?
It didn't make sense ... so you could create a sequence for that (don't know what you want):
//not tested : )
double d = 2.0;
xdoublesequence_ptr xds = xdoublesequence::create();
It's a shared_pointer so don't delete or free it ^.^