[erlang-questions] What is the best location to place common type specs?

Zhemzhitsky Sergey <>
Thu Jul 5 14:25:10 CEST 2012

Hello Loïc,

Thanks a lot for suggestions. 

Best Regards,

-----Original Message-----
From: Loïc Hoguin [mailto:] 
Sent: Thursday, July 05, 2012 4:11 PM
To: Zhemzhitsky Sergey
Subject: Re: [erlang-questions] What is the best location to place common type specs?


Your specs should belong to a single module. module1:myrec() isn't the same type as module2:myrec().

A bit off-topic but I wouldn't use a record over multiple modules (even though I've done it in the past, this is getting fixed). It's better to have your record belong to one module, make it opaque and to add functions to manipulate it without having to know what's in it. This way you can modify your record only in one place and not have to worry about breaking code everywhere.

On 07/05/2012 02:07 PM, Zhemzhitsky Sergey wrote:
> Hi guys,
> I have multiple .hrl files with multiple records. I’d like to define 
> separate types for these records and their fields.
> These records will be used across multiple modules, and I’m wondering 
> whether it is legal to define type specs in the hrl files?
> Or would it be better to have a separate module with exported common 
> type specs?
> Best Regards,
> Sergey
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Loïc Hoguin
Erlang Cowboy
Nine Nines

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