Are varargs functions discouraged in haskell?

[brandonchinn178]

ha and now we’re back to the original question

Defining the behaviour of a Num instance with other Num types and with itself

I would like to construct a type to handle simple error propagation. My type is: data Measurement a = Measurement !a !a One argument represents the value of the measurement and the other the error. I want to make it an instance of Num, but I want it to have this behaviour: – If I add it to a Num type, I only want the value to be added to the first argument k = Measurement 3.0 0.1 k + 3.0 -- should give Measurement 6.0 0.1 – if I add it to a Measurement, I want the sum of every argument k…

EDIT: OP, perhaps you might want to define the instances again, and just make newMeas, newMeas2, newMeas3 helpers for each arity you need. It’s a bit more boilerplate, but at least you won’t be exposing it to users