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dekker.one
1predicate fzn_span_reif(var opt int: s0, var int: d0,
2 array[int] of var opt int: s,
3 array[int] of var int: d,
4 var bool: b) =
5 b <-> (
6 (occurs(s0) <-> exists(i in index_set(s))(occurs(s[i]))) /\
7 s0 = min(s) /\
8 (absent(s0) -> d0 = 0) /\
9 s0 ~+ d0 = max([s[i] ~+ d[i] | i in index_set(s)])
10 );