[Previous] [Next]

XSLPsetuserfuncaddress

Purpose

Change the address of a user function

Synopsis

int XPRS_CC XSLPsetuserfuncaddress(XSLPprob Prob, int nSLPUF, void *Address);

Arguments

Prob	The current SLP problem.
nSLPUF	The index of the user function.
Address	The address of the user function.

Example

The following example defines a user function via XSLPchguserfunc and then re-defines the address.

double InternalFunc(double *, int *);
int nUF;

XSLPchguserfunc(Prob, 0, NULL, 023, 1, 
                NULL, NULL, NULL);

XSLPgetintattrib(Prob,XSLP_UFS,&nUF);
XSLPaddnames(Prob,XSLP_USERFUNCNAMES,"Func1",
             nUF,nUF);

XSLPsetuserfuncaddress(Prob, nUF, InternalFunc);

Note that InternalFunc is defined as taking two arguments (double* and int*). This matches the ArgType setting in XSLPchguserfunc. The external function name is NULL because it is not required when the address is given.

Further information

nSLPUF is an Xpress-SLP index and always counts from 1. It is not affected by the setting of XPRS_CSTYLE.

The address of the function is changed to the one provided. XSLPsetuserfuncaddress should only be used for functions declared as of type DLL or VB. Its main use is where a user function is actually internal to the system rather than being provided in an external library. In such a case, the function is initially defined as an external function using XSLPloaduserfuncs, XSLPadduserfuncs or XSLPchguserfunc and the address of the function is then provided using XSLPsetuserfuncaddress.