This is the "right" approach - speaking from experience after having tried both ways (10-90 vs 90-10). The general structure is that your application is built a

This is the "right" approach - speaking from experience after having tried both ways (10-90 vs 90-10). The general structure is that your application is built as a DAG with the nodes representing C++ functions (not methods on classes), with edges representing arbitrary datastructures (not objects), with the graph being constructed and hooked up in python and executed using a library like TBB