mccSay I have an API that takes a callback, and I have two functions, one for callbacks with arguments and one for nullary callbacks. I must do it this way. What naming choice would you use to distinguish the two variants? I feel like "nullary" is obscurantist
Greg Bray 
@mcc I seem to recall reactive framework had action=no argument call back and function or consumer for callback with arguments. They sometimes also just used generic func0 func1 func2 ... funcN interfaces