This function returns a resource constraint predicate whose operator(const IlcResourceConstraint& rc) returns IlcTrue if and only if the immediately preceding activity of the activity of rc is known. In case rc represents a virtual node, it is assumed that it represents the virtual sink node, and the evaluation of the predicate returns IlcTrue if and only if the teardown node (that is, the node that directly precedes the virtual sink node), is known. This predicate is implemented using IlcResourceConstraint::hasPrevRC.

This functions exists with either an IloEnv or an IloSolver as argument.