[erlang-questions] -spec for OTP

Kostis Sagonas kostis@REDACTED
Tue Dec 6 12:28:38 CET 2011

On 12/06/2011 12:04 PM, Andrzej Sliwa wrote:
> Hi,
> do you know guys where I can find -specs for application and other OTP
> behaviors (I mean callbacks & api specifications)?
> this is weird that we see on many presentations about start using specs
> in modern erlang code, but there is no specs in OTP behaviors :D

Callback specs for OTP behaviours is a language addition that will 
appear in the upcoming R15 release (scheduled for mid December).

There is a new attribute called -callback that specifies types that 
behaviour callbacks are supposed to have.  Given such information, one 
does not need to specify a behaviour_info/1 function anymore (at least 
as far as callbacks are concerned) since the compiler has been adapted 
to automatically generate this function. In addition, the dialyzer tool 
has been adapted to check behaviours.

As I wrote, this is coming in an OTP near you really soon now. In the 
meantime, if you are interested in this you can get a copy of the 
pre-release of R15 (from github) and see all behaviour modules 
containing such callback attributes and/or read the following paper:

	Typed callbacks for more robust behaviours


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