Example Domain

Jan Burse, created Aug 15. 2016
/**
* Prolog code for the little solver.
*
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:- use_module(library(minimal/delta)).
:- use_module(library(basic/lists)).
:- use_module(library(advanced/sets)).
% bound(+Atom, +Elem)
:- thread_local bound/2.
= bound(X, C),
bound(X, C), !.
zero <=
+ bound(X, _),
bound(X, _).
% domain(+Atom, +List)
:- thread_local domain/2.
zero <=
+ domain(_, []), !.
+ bound(X, C) <=
= domain(X, [C]), !.
= domain(X, D),
+ bound(X, C),
member(C, D), !.
zero <=
+ domain(X, _),
+ bound(X, _).
+ domain(X, F) <=
= domain(X, D),
- domain(X,E),
intersection(D, E, F).
% ?- use_module(library(minimal/hypo)).
% Yes
% ?- <= +domain(x,[1]), listing(bound/2), listing(domain/2).
% bound(x, 1).
% Yes
% ?- <= +domain(x,[1,2,3]), <= +domain(y,[2,3,4]),
% listing(bound/2), listing(domain/2).
% domain(x, [1,2,3]).
% domain(y, [2,3,4]).
% Yes
% ?- <= +domain(x,[1,2,3]), <= +domain(x,[2,3,4]),
% listing(bound/2), listing(domain/2).
% domain(x, [2,3]).
% Yes
% ?- <= +domain(x,[1,2,3]), <= +bound(x,4),
% listing(bound/2), listing(domain/2).
% No

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