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%
%  Main authors:
%     Guido Tack <tack@gecode.org>
%
%  Copyright:
%     Guido Tack, 2007
%
%  Last modified:
%     $Date: 2011-08-19 16:47:28 +0200 (Fri, 19 Aug 2011) $ by $Author: tack $
%     $Revision: 12318 $
%
%  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
%  without limitation the rights to use, copy, modify, merge, publish,
%  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
%  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
%  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
%  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
%  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
%
%
predicate range_gecode(array[int] of var int: x, int: xoff,
                       var set of int: s, var set of int: t);

predicate range(array[int] of var int: x, var set of int: s,
                                          var set of int: t) =
    assert(ub(s) subset index_set(x),
        "range: upper bound of 's' must be a subset of the index set of 'x'",
        if (min(index_set(x)) >= 0) then
            range_gecode(x,min(index_set(x)),s,t)
        else
            forall(i in ub(s)) (i in s -> x[i] in t) /\
            forall(i in ub(t)) (
                i in t -> exists(j in ub(s)) ( j in s /\ x[j] == i )
            )
        endif
    );