C / C++ / MFC

struct BinaryFunction<br />
{<br />
	double (*eval)(double, double);<br />
	char* sign;<br />
};<br />
<br />
double add(double a, double b)<br />
{<br />
	return (a+b);<br />
}<br />
<br />
double subtract(double a, double b)<br />
{<br />
	return (a-b);<br />
}<br />
<br />
int main(int argc, char* argv[])<br />
{<br />
	BinaryFunction** ppBFunctionList = new BinaryFunction*[2];<br />
	<br />
	char addSign[] = " + ";<br />
	BinaryFunction Add = { &add, addSign };<br />
	ppBFunctionList[0] = &Add;<br />
<br />
	char subSign[] = " - ";<br />
	BinaryFunction Sub = { &subtract, subSign };<br />
	ppBFunctionList[1] = ⋐<br />
<br />
	for (int i = 0; i < 2; i++) {<br />
		double dRes = (*ppBFunctionList[i]->eval)(3, 2);<br />
		printf("%.2f\n", dRes);<br />
	}<br />
<br />
	return 0;<br />
}

main ()
{
    BinaryFunction f [] = { {Add, "+"},
                            { Subtract, "-"},
                            { Power, "pow"},
                            { NULL, NULL}
                          };

    double dEval1 = DoAFunctionOne ("Add", 1.0, 2.0, f)
    double dEval2 = DoAFunctionTwo ("Add", 1.0, 2.0, &f)
}

double DoAFunctionOne (char *name, double A, double B, BinaryFunction *func)
{
    while (func && func->sign)
    {
        if (!lstrcmpi (name, func->sign))
        {
            if (!func->eval)
                break;
            return func->eval (A,B);
        }
        func++; // Move on to the next one...
    }

    // Raise an exception?
    return 0.0;
}
double DoAFunctionTwo (char *name, double A, double B, BinaryFunction **func)
{
    for (int n = 0; func && func [n]->sign; n++)
    {
        if (!lstrcmpi (name, func->sign))
        {
            if (!func [n]->eval)
                break;
            return func [n]->eval (A,B);
        }
    }

    // Raise an exception?
    return 0.0;
}

HDITEM MyItem = {0};
 
  MyItem.mask HDI_LPARAM;
  ...

<br />
//<br />
// Import database COM interface headers<br />
// See Microsoft Knowledge Base: Q253317 for warning messages.<br />
#pragma warning(push)<br />
#pragma warning(disable:4146 4192)<br />
<br />
#import "C:\Program Files\Common Files\system\ado\msadox.dll"<br />
#import "C:\Program Files\Common Files\System\ado\msado15.dll" rename ("EOF","ADOEOF") // ADO<br />
#import "C:\Program Files\Common Files\system\ado\msjro.dll" rename_namespace("JRODB") // Jet Replication Objects (JRO)<br />
<br />
using namespace ADODB;<br />
#pragma warning(pop)<br />

<br />
////////////////<br />
//	works OK<br />
#pragma warning (disable: 4146)<br />
// "ADO_X" works and without renaming EOF to adoEOF<br />
#import "d:\Program Files\Common Files\system\ado\msadox.dll"  rename_namespace("ADO_X") rename("EOF", "adoEOF")<br />
#import "d:\Program Files\Common Files\system\ado\msado15.dll" no_namespace rename("EOF", "adoEOF")<br />