[erlang-questions] Somebody please correct my -callback understanding

[Damian Dobroczyński]

Dnia śro, 14 gru 2011, 19:52:17 Damian Dobroczyński pisze:
> Dnia śro, 14 gru 2011, 19:38:33 Daniel Luna pisze:
>> 2011/12/14 Damian Dobroczyński <qoocku@REDACTED>:
>>> Wow, It's a miracle! I've just found the answer and (what I understand)
>>> a bug. IT IS "-behavior (...)" which is perfectly understood by the
>>> compiler but not by by the dialyzer! Dialyzer expects "-behaviour (...)"
>>> (note the different spelling).
>>
>> This is not a bug.  Erlang has always used 'behaviour' (and
>> 'behaviour_info').  See
>> http://en.wikipedia.org/wiki/American_and_British_English_spelling_differences#-our.2C_-or
>>
>> As a side note, Erlang allows for any user defined elements starting with -.
>>
>> If you for example add the following line to your code
>>
>> -my_own_local_thing(whatever_data).
>>
>> then this is fully legal Erlang, and its effect is seen if you run
>> Module:module_info()
>>
>> [...
>> {attributes,[{behaviour,[supervisor]},
>>               {my_own_local_thing,[whatever_data]}]},
>> ...]
>>
>> Cheers,
>>
>> Daniel
>
> From Erlang Reference Manual:
>
> """
> -behaviour(Behaviour).
>
> The atom Behaviour gives the name of the behaviour, which can be a user 
> defined behaviour or one of the OTP standard behaviours gen_server, 
> gen_fsm, gen_event or supervisor.
>
> The spelling behavior is also accepted."""" <--- HERE
>
> It's a bug. Besides as I mentioned, the compiler perfectly understand 
> the attribute "-behavior" giving me warnings about missing callbacks. 
> So, compiler understand and behave correctly with "-behavior" - 
> dialyzer don't.
>
> (Unfortunately (or maybe not) my code if full of "behaviors" ;) just 
> because it is accepted and understood not even deprecated).
>
> -- D.
>

I've just looked into "Erlang. Programming" by Cesarini & Thompson 
(2009), page 271, an example of gen_server (usr.el listining):

(...)
-behavior(gen_server).
(...)


Well, thats enough for me to be completely comvinced it's not a weird 
thing to write "-behavior (...)". I think it's in common, especially 
for Americans.

-- D.