Represents the assignments of a generalized assignment problem where each demand can be assigned to multiple supplies.
The set of supplies where each value is assigned to at least one demand.
Supplies that are not assigned to any demand.
The set of all demand objects.
The set of all demands that are assigned to at least one supply.
Data structure storing all demands that are not assigned to any supply.
Adds a new line to this Database . This line is returned and represents the assignment of the given demand to the given supply.
Returns the associated demand of the given assignment.
Returns the related supply of the given assignment.