Variadic determine number of inputs?

[robertspark]

I have read this post +thread but it’s fairly complex for a novice dabbler like me

Getting data for variadic nodes

Is there a way to determine what the arity is for a node, or what level we are currently on? The reason I ask is I’m looking to implement an LCD node with variable number of lines. I will need to know total number of lines selected to initialize LCD, and I need to know what level I’m currently on to know which line of LCD to write to. In my case, I need to get this info from my C++ code; I would imagine it would be quite a bit harder to provide the info in a std patch not using C++ code… I gue…