[Discuss-gnuradio] Callback Function in Blocks for C++

Hello Everyone,

I am trying to build a new block from scratch, that allows me to change parameter values while the flowgraph is running.

I have found that for the .XML code i must use:

<callback>"Function"($XXX)</callback>

My question is, in the c++ code , besides creating the function and applying values to the parameter, do i need to do something else so the callback work?

Thanks for the response.