[erlang-questions] Module dependencies - from newbie

Bengt Kleberg <>
Tue Apr 29 13:24:51 CEST 2008


Have you considered using the same module name for the different
implementations and hot load the different modules when you want to try


On Tue, 2008-04-29 at 23:09 +1200, Francis Stephens wrote:
> I am currently having a problem finding a good way to manage some
> module dependencies.
> I have a single module which called 'formula'.  It looks very similar
> to the core dict module which allows users to create, query and modify
> their dict datastructures.  My formula module allows users to create,
> query and modify boolean formula.
> However, I am currently experimenting with different internal data
> structures for the formula module and would like to be able to swap
> them in and out of my program easily.  Currently there are a number of
> different modules which make function calls to the formula module and
> it seems that I would have to go and edit each function prefix for
> every call.
> My current options seem to be to me
> 1: Add a macro which will change the prefix for me at compile time.
> 2: Write each prefix as a Variable (Prefix:fun()) and pass in the
> appropriate module with each function call.  I believe those calls are
> significantly slower than non-variable prefixed function calls.
> 3: reorganise my code in a more sensible way.
> Currently I am still thinking about the code organisation in a very OO
> way and if there is a good Erlang approach to this kind of problem I
> would love to learn about it.
> Thanks in advance.
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