The term extractable object comes from the fact that an instance of IloSolver extracts pertinent information from the modeling object in a form appropriate to that search algorithm for use in solving the problem.

All extractable classes are derived from a common base class IloExtractable, documented in the IBM ILOG Solver Reference Manual. Concert Technology provides a wealth of extractable classes that allow you to define variables, ranges, columns, various kinds of constraints, and objective functions. The most prominent extractable classes include: IloModel, IloNumVar, IloObjective, IloConstraint and IloRange.

You can construct an extractable object only within an environment; in other words, you must pass an instance of IloEnv as a parameter to the constructor of an extractable object. The environment manages services for the extractable object, such as memory management.

For more information about extractable objects, see the IBM ILOG Concert Technology User's Manual.