Re: [eclipse-clp-users] Constraints on structures

Dear Joachim,

    Thanks for the answer. It worked.


I have one more issue. I am trying the following.

search([A[year of book], B[year of book]],0,input_order,indomain_split,complete,[]).

I want to be able to search for multiple variables within the structure using search. May be the syntax does not allow me to do so. I had to settle down for this.
search([Y, Z],0,input_order,indomain_split,complete,[]),
where Y and Z are references to the structure variables. Since I need to generate clp code, it demands a generic solution and it would be more effort with the latter approach.


Please suggest. 

Cheers,

Shrirang

:-lib(ic).
:- local struct( others(dvds, ratings) ).
:- local struct( see(others, stars) ).
:- local struct( book(author, title, year, publisher, cost, details, see) ).
top(ListOfBooks):-
  ListOfBooks = [
     D, A, B, C
 ],
  A = book{see:Z, title:"tom sawyer", author:twain},
  
  B = book{see:Z, title:"tintin and the destination moon", author:herge},
  
  B[year of book] :: -100 .. 100,
  
  A[year of book] #> 10,
  
  A[year of book] #< 20,
  
  A[cost of book] #> A[year of book],
  
  A[cost of book] #< 30,
  
  %book{year:Y} = A,
  
   %Y #> 10,
   
   %book{year:Z} = B,
  
   %Z #> 15,
  
  %search([Y, Z],0,input_order,indomain_split,complete,[]),
  
  
  search(A[cost of book],0,input_order,indomain_split,complete,[]).
  
  %search([A[year of book], B[year of book]],0,input_order,indomain_split,complete,[]).



________________________________________
From: Joachim Schimpf [jschimpf_at_...311...]
Sent: 04 December 2014 02:12:53
To: eclipse-clp-users_at_lists.sourceforge.net
Subject: Re: [eclipse-clp-users] Constraints on structures

On 03/12/14 09:10, Edgaonkar, Shrirang wrote:
> Dear clp users,
>
>    I have the following structure. I would like to have constraint on year like
> A:year > 10 and then have eclipse resolve the constraint.
>
> :-lib(ic).
>
> :- local struct( others(dvds, ratings) ).
> :- local struct( see(others, stars) ).
> :- local struct( book(author, title, year, publisher, cost, details, see) ).
>
> top(ListOfBooks):-
>    ListOfBooks = [
>       D, A, B, C
>   ],
>    A = book{see:Z, title:"tom sawyer", author:twain, cost:23.34}.
>

Some ways to do that (assuming A is a book{} structure):

     book{year:Y} = A,         % extract the year field from the book structure A
     Y #> 10.

or

     arg(year of book, A, Y),  % extract the year field from the book structure A
     Y #> 10.

or

     A[year of book] #> 10.


-- Joachim





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