include "fzn_span.mzn";
include "fzn_span_reif.mzn";

/** @group globals.scheduling
  Span constraint for optional tasks. Task (\a s0,\a d0) spans the optional
  tasks (\a s[\p i],\a d[\p i]) in the array arguments.
*/
predicate span(var opt int: s0, var int: d0,
               array[int] of var opt int: s,
               array[int] of var int: d) =
    assert(index_set(s) = index_set(d),
        "span: index sets of third and fourth argument must be identical",
        fzn_span(s0,d0,s,d)
    );