[erlang-questions] OO programming style in Erlang?

Adam Lindberg <>
Tue Jan 23 16:13:46 CET 2007


As a side topic regarding OO and Erlang ways of thinking, here's a
good article about Erlang and concurrency. It touches object
orientation and comparisons with Java for example, and is somewhat of
a mind opener. :-)

http://www.defmacro.org/ramblings/concurrency.html

On 1/22/07, Sean Hinde <> wrote:
>
> On 22 Jan 2007, at 11:39, Ulf Wiger wrote:
>
> > Den 2007-01-22 11:52:35 skrev Ladislav Lenart <>:
> >
> >> *Question:* Is there a way such polymorphism can be
> >> achieved in Erlang without actually merging (see above)
> >> the modules that should behave polymorphically?
> >
> > No universally agreed upon common method, no,
> > if I understood your question correctly.
> >
> > Xmerl, for example, introduced a notion of module
> > inheritance, with which one were supposed to extend
> > the functionality of export callbacks. See e.g.
> > http://jungerl.cvs.sourceforge.net/jungerl/jungerl/lib/xmerl/src/
> > xmerl.erl?revision=1.2&view=markup
> > mainly lines 267-313.
> > (or the OTP source tree for a more current version.)
> >
> > I don't know if anyone has actually made use of it.
>
> I suspect not.
>
> IMO the most important thing to take away from this discussion is
> that OO style is not the normal or best way to program in Erlang.
>
> Try not to think of erlang processes as simply repositories of state
> - they are so much more than that.. Model each real world activity as
> an erlang process, and have each process maintain as much state as it
> needs to function as that real world process.
>
> The API into the process would not typically be get/set operations,
> but real world calls like make_sale() or purchase(). It can all be at
> a much higher level using Erlang.
>
> If you also follow the other advice in Ulf's post you will be getting
> there :-)
>
> Sean
>
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-- 
Adam Lindberg
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