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% Main authors:
% Guido Tack <tack@gecode.org>
%
% Copyright:
% Guido Tack, 2007
%
% Last modified:
% $Date: 2012-03-19 01:56:37 +0100 (Mon, 19 Mar 2012) $ by $Author: tack $
% $Revision: 12583 $
%
% This file is part of Gecode, the generic constraint
% development environment:
% http://www.gecode.org
%
% Permission is hereby granted, free of charge, to any person obtaining
% a copy of this software and associated documentation files (the
% "Software"), to deal in the Software without restriction, including
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% distribute, sublicense, and/or sell copies of the Software, and to
% permit persons to whom the Software is furnished to do so, subject to
% the following conditions:
%
% The above copyright notice and this permission notice shall be
% included in all copies or substantial portions of the Software.
%
% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
% EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
% MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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% LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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%
%
predicate gecode_inverse_set(array[int] of var set of int: f,
array[int] of var set of int: invf, int: xoff, int: yoff);
predicate inverse_set(array[int] of var set of int: f,
array[int] of var set of int: invf) =
forall(i in index_set(f)) (
f[i] subset index_set(invf)
) /\
forall(j in index_set(invf)) (
invf[j] subset index_set(f)
) /\
if (min(index_set(f)) >= 0 /\ min(index_set(invf)) >= 0) then
gecode_inverse_set(f,invf,min(index_set(f)),min(index_set(invf)))
else
forall(i in index_set(f), j in index_set(invf)) (
(j in f[i] <-> i in invf[j])
)
endif;
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