Hi Guys, I am trying to create a rational_sync_block class in an out of tree module, which is both an interpolator and decimator with a rational data rate. So I just wrote the class, almost exactly like how sync_interpolator is written. Then when I want to use this new base class in a derived real block named xxx_block in my out of tree module, then everything compiles, but the swig generation fails with an error message that xxx_block cannot be allocated because it is abstract type has an virtual work function. When I change the base type back to sync_interpolator, then swig is happy. I do not understand what is so special about gr::sync_interpolator, and why I cannot reproduce the sync_interpolator in a way that makes swig happy. Any ideas?
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