IloNumVar are used to represent modeling variables. They are described by the lower and upper bounds for the variable, and a type which can be one of ILOFLOAT, ILOINT, or ILOBOOL for continuous, integer or boolean variables, respectively.
IloSemiContVar are used to represent semi-continuous variables, which may be 0 (zero) or may take a value within an interval defined by its semi-continuous lower and upper bounds. Semi-continuous variables are usually defined as continuous variables, but you can designate an instance of IloSemiContVar as integer by using the type indicator it inherits from IloNumVar.
IloObjective represent objective functions of optimization models. IloCplex deals with models containing at most one objective function, and the objective function must be linear, piecewise linear, or quadratic.
IloRange represent constraints of the form lower bound <= expression <= upper bound. Any floating point value or +/- IloInfinity can be used for the bounds.
IloConversion override the type of a variable in a model. This allows you to use the same variable with different types in different models.
IloModel represent models which consist of extractable objects. They can be used to create submodels or additional models in a given environment.
IloSOS1 represent type 1 Special Ordered Sets (SOS), which specify that at most one variable from a set of variables may take a nonzero value. Similarly, objects of the class IloSOS2 represent type 2 SOS, which specify that at most two variables from a set of variables may take nonzero values and that these two variables must be neighbors with respect to a specified order of the variables. SOS1 are rarely used and SOS2 are mostly used to model piecewise linear functions, for which Concert Technology provides direct support (with the class IloPiecewiseLinear).
IloAnd are used in conjunction with objects of the class IloSolution.
Refer to the ILOG Concert Technology Reference Manual for more information on these classes.
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