ILOG CPLEX C++ API 9.0 Reference Manual

ILOFLOAT, for continuous,
ILOINT, for integer,
ILOBOOL, for Boolean variables.
Program (QCP). If in addition to the quadratic constraints, there are discrete variables in
the problem (such as integer, Boolean, or semi-continuous variables), then it is known as
MIQCP.
◆ Objects of the class IloNumVar represent modeling variables. They are defined
by the lower and upper bounds of the variable, and the type of the variable. The type
of the variable can be one of these:
◆ Objects of the class IloSemiContVar represent semi-continuous variables. A
semi-continous variable 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.
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Objects of the class 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.
Objects of the class IloRange represent constraints of the form: lower bound
≤ expression ≤ upper bound. Any floating-point value or +/- IloInfinity can be
used for the bounds.
◆ Objects of the class IloConversion change the type of a variable in a model.
This class allows you to use the same variable with different types in different
models.
◆ Objects of the class IloModel represent models which consist of extractable
objects. They can be used to create submodels or additional models in a given
environment.
◆ Objects of the class IloSOS1 represent type 1 Special Ordered Sets (SOSs). A
type 1 SOS specifies that at most one variable from a set of variables may take a
nonzero value. Similarly, objects of the class IloSOS2 represent type 2 SOSs. A
type 2 SOS specifies 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).
◆ Objects of the class IloAnd are used in conjunction with objects of the class
IloSolution.
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 16