These functions return a goal which tests if the current variable instantiation is consistent with a metaheuristic.

If specified, nid is used to communicate the index and the delta of a neighbor supplied by goals IloScanDeltas and IloScanNHood.

Conversely, when no delta is specified, these functions return a goal that calls mh.test(solver, IloSolution()). If the testing method does not cause a failure and returns IloTrue, the goal succeeds. Otherwise it fails.