Re: Question about compiling of files lgt, pl and c++

[Paulo Moura]

On Segunda, Fev 17, 2003, at 15:04 Europe/Lisbon, CARLOS EGEA wrote:

> I have a problem when I want to link two files, a lgt
> file and a pl file. For instance.
>
> list.lgt
>
> :-object(list).
>
>    :-public(member/2).
>    :-public(ocu/3).
>
>     member(Element,[Element|_]).
>     member(Element,[_|List]):-
>        member(Element,List).
>     ocu(X,Y,Z):-ocurrencia(X,Y,Z).
> :-end_object.
>
>
> pru.pl
>
> ocurrencia(X,Y,Z):-Z is X+Y.

Write instead:

:-object(list).

   :-public(member/2).
   :-public(ocu/3).

    member(Element,[Element|_]).
    member(Element,[_|List]):-
       member(Element,List).
    ocu(X,Y,Z):-{ocurrencia(X,Y,Z)}.
:-end_object.

See the Logtalk documentation for a description of the {}/1 control 
construct.

> But If I have the next, it goes well.
>
> list.lgt
>
> :-object(list).
>
>    :-public(member/2).
>    :-public(ocu/3).
>
>     member(Element,[Element|_]).
>     member(Element,[_|List]):-
>        member(Element,List).
>     ocu(X,Y,Z):-append(X,Y,Z).
> :-end_object.
>
> append is un built-in predicate, but It is defines in
> other file and it goes well.

This second version of the list object works because append/3 is a 
built-in predicate (and detected as such by Logtalk).

Hope this helps,

Paulo


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Paulo Jorge Lopes de Moura
Dep. of Informatics                   Office 4.3  Ext. 3257
University of Beira Interior          Phone: +351 275319700
6201-001 Covilhã                      Fax:   +351 275319891
Portugal

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