Arity of funs

Bjorn Gustavsson <>
Wed Mar 15 11:11:31 CET 2000


There is no way to find out the arity of a fun.

There are, however, erlang:fun_info/1,2 BIFs that return some information
about a fun, but not the arity. (These BIFs are meant to be used for
debugging purposes, not for use in applications.)

/Bjorn

Tony Pedley <> writes:

> 
> Content-type: text/plain ; charset = us-ascii
> 
> Hi,
> Well I've searched the OTP book, trawled the erlang questions archive(very good by the way, however
> there should
> be an all button on the Available Subdirectories) and I still can't work out how to do it.
> 
> How do you extract the arity of a Fun? e.g How do I do this
> 
> F = fun(X,Y,Z) -> end,
> 
> X = get_fun_arity(F).
> 
> 3
> 
> All the best
> 
> Tony
> 
> --
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