Type Specification of net:getnameinfo()

Micael Karlberg micael.karlberg@REDACTED
Wed Jan 27 15:33:07 CET 2021


No, net is *not* planned to be removed!
I was talking about the ifdef'ing, nothing else.


From: Nalin Ranjan <ranjanified@REDACTED>
Sent: Wednesday, January 27, 2021 3:01 PM
To: Nicolas Martyanoff <khaelin@REDACTED>
Cc: Micael Karlberg <micael.karlberg@REDACTED>; Erlang-Questions Questions <erlang-questions@REDACTED>
Subject: Re: Type Specification of net:getnameinfo()

For this particular function its a delegation to prim_net:getnameinfo/2<https://protect2.fireeye.com/v1/url?k=84aecd19-db35f434-84ae8d82-8692dc8284cb-c2634a3f89b46f21&q=1&e=b2b6d2f6-9676-43a2-901a-9a8708bb6c75&u=https%3A%2F%2Fgithub.com%2Ferlang%2Fotp%2Fblob%2Fmaster%2Ferts%2Fpreloaded%2Fsrc%2Fprim_net.erl%23L160> or erlang:error(notsup). Of course, apart from some argument match.


And Micael mentioned its destined to be removed in future. ��

नलिन रंजन

On Wed, Jan 27, 2021 at 9:13 AM Nalin Ranjan <ranjanified@REDACTED<mailto:ranjanified@REDACTED>> wrote:
Thanks a lot Nicolas.

Will go through, and then may be express my hunch that this is a way in which details are either leaking and/or is not sufficient at the level of a type spec. But who knows I endup correcting myself after a little follow up.

नलिन रंजन

On Tue, Jan 26, 2021, 10:05 PM Nicolas Martyanoff <khaelin@REDACTED<mailto:khaelin@REDACTED>> wrote:
On 2021-01-26 21:46, Nalin Ranjan wrote:
> 2. In this particular case of type specification, the only difference is in
> one of the parameters of the function. I was also wondering if we could
> have used a union instead to write the same type spec, it would have been
> simpler?
> For example,
> Instead of writing a type spec like this
>           SomeVar :: xxx_type().
> -else
>          SomeVar :: yyy_type().
> We could specify the same type spec as:
>         SomeVar :: xxx_type() | yyy_type().
> Any reason we preferred the former over the latter?

If Erlang is compiled without socket support, some types will not exist at
all. Using the preprocessor[1] makes it possible to provide specifications
with types which actually exist, with or without socket support.

[1] https://erlang.org/doc/reference_manual/macros.html<https://protect2.fireeye.com/v1/url?k=7959406e-26c27943-795900f5-8692dc8284cb-69c47e0211b63af4&q=1&e=b2b6d2f6-9676-43a2-901a-9a8708bb6c75&u=https%3A%2F%2Ferlang.org%2Fdoc%2Freference_manual%2Fmacros.html>

Nicolas Martyanoff
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