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dekker.one
1include "fzn_alternative.mzn";
2include "fzn_alternative_reif.mzn";
3
4/** @group globals.scheduling
5Alternative constraint for optional tasks. Task (\a s0,\a d0) spans the
6optional tasks (\a s[\p i],\a d[\p i]) in the array arguments
7and at most one can occur
8*/
9predicate alternative(var opt int: s0, var int: d0,
10 array[int] of var opt int: s,
11 array[int] of var int: d) =
12 assert(index_set(s) = index_set(d),
13 "alternative: index sets of third and fourth argument must be identical",
14 fzn_alternative(s0, d0, s, d)
15 );
16
17predicate alternative_reif(var opt int: s0, var int: d0,
18 array[int] of var opt int: s,
19 array[int] of var int: d, var bool: b) =
20 assert(index_set(s) = index_set(d),
21 "alternative: index sets of third and fourth argument must be identical",
22 fzn_alternative_reif(s0, d0, s, d, b)
23 );