C / C++ / MFC

#include <fstream><br />
#ifdef _DEBUG<br />
#define new DEBUG_NEW<br />
#endif

#ifdef _DEBUG<br />
#define new DEBUG_NEW<br />
#endif<br />
#include <fstream>

#include <iostream>
#include <string>

using namespace std;

int main()
{

// Global Variables
int userinput;
int sum = 0;
sum = sum + userinput;


// Start While loop
while (userinput != 0)
{
// Prompt User for input
cout << "Please enter a number. When you are finished, type 0 and press Enter." ;
cin >> ++userinput ;    

}
cout << "The sum is:" << sum << endl;
return 0;
}

class CTestClass
{
public:
  void AMethod(int x);
  BOOL BMethod(char y);
};

template<typename TParamType>
class TTestTemplate
{
  typedef void(CTestClass::* LPFN_AMETHOD)(TParamType);
  typedef BOOL(CTestClass::* LPFN_BMETHOD)(TParamType);

  bool fIsAFn;
  union {
    LPFN_AMETHOD fnA;
    LPFN_BMETHOD fnB;
  };
public:
  TTestTemplate(LPFN_AMETHOD pFn):fnA(pFn), fIsAFn(true ) {}
  TTestTemplate(LPFN_BMETHOD pFn):fnB(pFn), fIsAFn(false) {}

  void Call(CTestClass *pInstance, TParamType val);
};

template<typename TParamType>
void TTestTemplate<TParamType>::Call(CTestClass *pInstance, TParamType val)
{
  if (fIsAFn) (pInstance::*fnA)(val); //<---- !!!!!!!!!!!!!! THIS IS THE LINE !!!!!!!!!!!!!! -------------
  else (pInstance::*fnB)(val);
}