In the Callable Library, ILOG CPLEX defines a few special data types for specific ILOG CPLEX objects, as you see in Table 4.1. The types starting with CPXC represent the corresponding pointers to constant (const) objects
Table 4.1 Special Data Types in the ILOG CPLEX Callable Library
Data type |
Is a pointer to |
Declaration |
Set by calling |
|---|
CPXENVptr CPXCENVptr |
ILOG CPLEX environment |
CPXENVptr env; | |
CPXLPptr CPXCLPptr |
problem object |
CPXLPptr lp; | |
CPXNETptr CPXCNETptr |
problem object |
CPXNETptr net; | |
CPXCHANNELptr |
message channel |
CPXCHANNELptr channel; | |
.
When any of these special variables are set to a value returned by an appropriate routine, that value can be passed directly to other ILOG CPLEX routines that require such parameters. The actual internal type of these variables is a memory address (that is, a pointer); this address uniquely identifies the corresponding object. If you are programming in a language other than C, you should choose an appropriate integer type or pointer type to hold the values of these variables.
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