[erlang-questions] Trouble with init/1 spec

Martin Bjorklund <>
Wed Mar 24 17:22:51 CET 2010


Jay Nelson <> wrote:
> I am having trouble specifying an init/1 function.  This should be a
> problem for most gen_xxx applications that use records for State, so I
> must have not used the right query terms to search the archives.
> Here is my init/1 function for a gen_fsm:
> -spec init(list()) -> {ok, ?RECONNECT, #twfsm_state{}}.
> init([Server, Port, User, Pwd]) ->
>     {ok, ?RECONNECT,
>      #twfsm_state{server=Server, port=Port, user=User, pwd=Pwd}}.
> The problem is that I cannot figure out how to specify that I really
> am passing in a list of the type [string(), non_neg_integer(),
> string(), string()].  Declaring it as list(any()) means the fields on
> the record have to all be declared any().  As long as my port field is
> declared non_neg_integer() in the record definition, I can't get past
> the dialyzer warning.

Make the argument to init/1 a 4-tuple instead of a list.


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