[erlang-questions] package namespaces question

Enrique Marcote <>
Tue Nov 10 20:39:32 CET 2009


Hola Angel,

Try importing gs.

Saludos,

Enrique


El 10/11/2009, a las 20:10, Angel Alvarez escribió:

> Hi Guys!
> 
> Im currently reading erlang archives from 2004
> 
> On 10/05/2004 Someone talked about package namespaces ("Is erlang too small" thread) so i decided to just test this "new2 erlang knowledge.
> 
> iv just borrowed some little code from a gs article... :-)
> 
> the module starts like this:
> 
> 
> -module(gui).
> -export([init/0]).
> 
> init() ->
>    S = gs:start(),
>    Win = gs:create(window, S, [{width, 350}, {height, 100}]),
>    gs:create(button, quit, Win, [{label, {text, "Quit"}}, {x, 0}]),
> ...
> 
> so on the erlang shell gui:init(). just runs the example..
> So i changed the module to use package style names...
> 
> 
> -module(angel.tests.gui).
> -export([init/0]).
> 
> init() ->
>    S = gs:start(),
>    Win = gs:create(window, S, [{width, 350}, {height, 100}]),
>    gs:create(button, quit, Win, [{label, {text, "Quit"}}, {x, 0}]),
> ...
> 
> and moved the gui.erl to $PWD/angel/test/gui.erl
> 
> 
>> :~/Datos/Docs/Personal/Erlang/Code/angel/test> erlc gui.erl
>> cd ../../
>> :~/Datos/Docs/Personal/Erlang/Code/ 
> 
> but now firing at the shell results in :
> 
> :~/Datos/Docs/Personal/Erlang/Code> erl
> Erlang R13B01 (erts-5.7.2) [source] [rq:1] [async-threads:0] [hipe] [kernel-poll:false]
> 
> Eshell V5.7.2  (abort with ^G)
> 1> angel.test.gui:init().
> ** exception error: undefined function 'angel.test.gs':start/0
>     in function  'angel.test.gui':init/0
> 
> What's wrong? 
> Is needed the same convention on the rest of modules 
> after you start using package name styles?
> 
> 
> From http://www.erlang.se/publications/packages.html
> 
> "m2:g(X) becomes a call to foo.bar.m2 
> 
> If this is not what was intended, the call can be written explicitly, as in 
>    -module(foo.bar.m1).
>    -export([f/1]).
> 
>    f(X) -> fee.fie.foe.m2:g(X)."
> 
> it seems bit embarrasing, i think is why perhaps no one is using this feature 5 years later...
> 
> 
> Thanks Angel
> -- 
> No imprima este correo si no es necesario. El medio ambiente está en nuestras manos.
> ->>-----------------------------------------------
>    Clist UAH a.k.a Angel
> ---------------------------------[www.uah.es]-<<--
> 
> Tú lo compras, yo lo copio. Todo legal.
> 
> ________________________________________________________________
> erlang-questions mailing list. See http://www.erlang.org/faq.html
> erlang-questions (at) erlang.org
> 



More information about the erlang-questions mailing list