[erlang-questions] Erlang/OTP R15B has been released

Lukas Larsson lukas@REDACTED
Thu Dec 15 10:21:43 CET 2011

OTP-9621 is the ticket number relating to this change.

OTP-9621  Add '-callback' attributes in stdlib's behaviours

	      Replace the behaviour_info(callbacks) export in stdlib's
	      behaviours with -callback' attributes for all the callbacks.
	      Update the documentation with information on the callback
	      attribute Automatically generate 'behaviour_info' function
	      from '-callback' attributes

	      'behaviour_info(callbacks)' is a special function that is
	      defined in a module which describes a behaviour and returns a
	      list of its callbacks.

	      This function is now automatically generated using the
	      '-callback' specs. An error is returned by lint if user
	      defines both '-callback' attributes and the behaviour_info/1
	      function. If no type info is needed for a callback use a
	      generic spec for it. Add '-callback' attribute to language

	      Behaviours may define specs for their callbacks using the
	      familiar spec syntax, replacing the '-spec' keyword with
	      '-callback'. Simple lint checks are performed to ensure that
	      no callbacks are defined twice and all types referred are

	      These attributes can be then used by tools to provide
	      documentation to the behaviour or find discrepancies in the
	      callback definitions in the callback module.

	      Add callback specs into 'application' module in kernel Add
	      callback specs to tftp module following internet
	      documentation Add callback specs to inets_service module
	      following possibly deprecated comments


On Thu, Dec 15, 2011 at 8:00 AM, Jack Moffitt <jack@REDACTED> wrote:
> > PS. It's of course not a big deal, but it's a bit of a pity that behaviour
> > callbacks was not listed in the R15B release highlights... It's a language
> > addition after all, which had to wait for quite a long time in order to be
> > included in a major instead of some minor release.
> I can't seem to find any mention of it in the README either. Would you
> mind pointing us to some documentation of this new feature? It sounds
> interesting.
> jack.
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