Hi,
Outputting c++ from the companion would be a great addition to GNU Radio. A small question: the possibility of having loops on the flowgraph is contemplated on this project? We've been using GNU Radio for teaching for some years now (highschool, undergraduate and graduate students), and such feature would be very useful and illustrative. For instance, when using a PLL, we have to resort to feedforward schemes or using the blocks already part of GNU Radio, but as a black box of sorts. Coding in c++ would be asking too much from students in a course where the focus is on communications, whereas the companion is simply perfect in terms of intuitiveness and ease of use.