Mathematica: How to check if no argument is supplied to a function? -


how check if no argument supplied function?

for example, if have:

  f[x_integer]:=1   f[x_]:=message[errm::err, x]

and call f no argument:

   f[]

'nothing happens', want force specific (error-)condition.

( background: making munit tests packages , oo-system classes. )

this?

f[x_integer] := 1 f[x_] := message[errm::err, x] f[] := message[errm::err]

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