Macro IlcTransitionCost

This macro defines a function that returns an instance of the class IlcTransitionCostObject. Such an object can be passed to the function IlcUnaryResource::addNextTransitionCost or IlcUnaryResource::addPrevTransitionCost. In that case, the object defines a transition cost function to be used by the sequence constraint on the invoking unary resource.

Notice that this transition cost is constant, that is, only the function IlcTransitionCostObject::getTransitionCost is defined and any call to IlcTransitionCostObject::getTransitionCostMin or IlcTransitionCostObject::getTransitionCostMax raises an error. Also note that the setup and teardown costs are zero.

Example

The call IlcTransitionCost(functionName) defines the following function:

 IlcTransitionCostObject functionNameObject(IloSolver s); 

The argument functionName should be a pointer to a function that takes two instances of the class IlcResourceConstraint as its arguments and returns an integer. Here is an example of such a function:

 IlcInt myTransCostFct(const IlcResourceConstraint rct1,
 		     const IlcResourceConstraint rct2)
 {
   return IlcAbs(rct1.getActivity().getTransitionType() -
 	       rct2.getActivity().getTransitionType());
 }

Now using that function and the call IlcTransitionCost(myTransCostFct), we can define the following function:

 IlcTransitionCostObject myTransCostFctObject(IloSolver s); 

This function can be used to define a transition cost for a unary resource resource:

 IlcUnaryResource resource(schedule);
 s.add(resource.makeSequenceConstraint());
 resource.addNextTransitionCost(IlcTransitionCost(myTransCostFct);