[eclipse-users] R: R: ec_cleanup() segmentation fault

From: Giuseppe Di Guglielmo <giuseppe.diguglielmo_at_...95...>
Date: Thu, 07 Feb 2008 18:44:33 +0100
Hi Kish,
I will restructure my application to support constraints on ECLiPSe side. 

Can I ask you how can I retrieve a value from ECLiPSe if I post the
constraints in this way: post_goal("X < 2") ? 

These are some works of my group based on ECLiPSe, are you interested to
support us?
http://www.pld.ttu.ee/~jaan/PDF/p146.pdf

Giuseppe


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> -----Messaggio originale-----
> Da: Kish Shen [mailto:kisshen@...5...]
> Inviato: Thursday, February 07, 2008 3:45 PM
> A: Giuseppe Di Guglielmo
> Cc: eclipse-users@...2...
> Oggetto: Re: [eclipse-users] R: ec_cleanup() segmentation fault
> 
> Hi Guiseppe,
> 
> 
> Giuseppe Di Guglielmo wrote:
> > Hi Kish,
> > thanks.
> >
> > Does exist a way to submit via a C/C++ API to ECLiPSe constraints
> > dynamically created?
> >
> > Let us imagine a post_goal function which receives a string rather than
a
> > complex ECLiPSe data-structure, in this way I could write
> > post_goal("x<2");
> > or
> > post_goal(my_constraint);
> >
> >
> 
> The C++ interface does allow you to post a string as a goal which will
> be parsed by ECLiPSe,:
> 
> void post_goal(const char *)
> 
> which iw described on the same page in the Embedding and Interfacing
> manual that I mentioned in my last reply to you:
> 
> http://www.eclipse-clp.org/doc/embedding/embroot067.html
> 
> Note that
> 
> 1) the string must be in correct ECLiPSe syntax (so your "x<2" is
> incorrect, because variables should begin with upper case letters, e.g.
> "X < 2"). This may be a little difficult to do correctly from your C++
> program, if you have complicated expressions.
> 
> 2) Each post_goal() is parsed individually when they are executed, so
> variables in one post_goal will not be linked to another post_goal().
> 
> post_goal("X > 3");
> post_goal("X > 4");
> 
> the two Xs are different variables.
> 
> So this probably does not do what you want to do, unless you use a
> single post_goal to post all the constraints and collect the results you
> want back as well.
> 
> In short, you are better off writing most of the program on the ECLiPSe
> side. Is there any reason why you can't dynamically generate the
> constraints on the ECLiPSe side? I think the best way to approach your
> problem is to write an ECLiPSe program which has a top-level query that
> is called from your C++ code, which just passes the information needed
> by the ECLiPSe program to generate the constraints you want, and to
> return the result you want, *all in one goal* that you call with a
> single post_goal().
> 
> It is difficult to give a relevant example that suit your needs without
> knowing more about how your constraints are generated. However, examples
> of what can be passed in your post_goal includes:
> 
> 1) the filename giving the file that contains the information to
> generate the constraints you need, if your constraint/problem is
> specified in a file.
> 
> 2) some flat representation of your constraints (e.g. "op(<) var(X)
> int(2)" for X < 2) that can be easily parsed by your ECLiPSe program, if
> your constraints are generated by some C++ application.
> 
> Cheers,
> 
> Kish
> 
> 
> > where my_constraint is built runtime as a string.
> >
> > Giuseppe
> >
> >
> >
----------------------------------------------------------------------------
> > Giuseppe Di Guglielmo       Dept. of Computer Science - University of
> > Verona
> >                                Strada le Grazie, 15 - 37134 Verona -
Italy
> >
> > Phone Office:   +39 045 8027049         Fax:    +39 045 8027068
> > Phone Home:     +39 045 6152251         Mobile: +39 347 0493371
> >
> > WWW: http://profs.sci.univr.it/~diguglielmo
> >
> > email: giuseppe.diguglielmo@...95...
> > email: diguglielmo@...96...          Skype: giuseppe.diguglielmo
> >
> >
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> >
> >
> > This e-mail message is intended for the addressee(s) only and may
contain
> > confidential and or privileged information.  If you are not the intended
> > recipient of this e-mail message, you should not read, copy, forward or
> > otherwise distribute or further disclose the information in it. If you
have
> > received this e-mail message in error, please contact the originator of
this
> > e-mail message via e-mail and delete all copies of this message from
your
> > computer or network, thank you.
> >
> >
> >
> >
> >
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Received on Thu Feb 07 2008 - 17:44:46 CET

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