[erlang-questions] Re: Using -spec for callbacks when defining behaviours

Ulf Wiger <>
Wed Mar 17 18:17:41 CET 2010


On Wed, 17 Mar 2010 17:26:38 +0100, Magnus Henoch  
<> wrote:

> How about using a separate clause of the behaviour_info function for
> type specs?  Like this:
>
> %% foo.erl
> -module(foo).
> -compile(export_all).
>
> behaviour_info(callbacks_with_types) ->
>     [{foo, 1, "-spec foo(A) -> A."},
>      {bar, 0, "-spec bar() -> 'ok'."}];
> behaviour_info(callbacks) ->
>     [{F,A} || {F,A,_Spec} <- behaviour_info(callbacks_with_types)].
>

Perhaps the clause could rather be

behaviour_info(specification) ->
    [{foo, 1, "-spec foo(A) -> A."}, ...].

The behaviour_info(callbacks) clause would only be needed
for backwards compatibility.

BR,
Ulf
-- 
Ulf Wiger
CTO, Erlang Solutions Ltd, formerly Erlang Training & Consulting Ltd
http://www.erlang-solutions.com
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