C / C++ / MFC

#define CHOOSE_FUNCTION(i, f1, f2) do { if((i) == 0) (f1)(); else (f2)(); } while(0)

CHOOSE_FUNCTION(i, fun2, fun3);
CHOOSE_FUNCTION(j, fun4, fun5);
// etc...

#pragma warning(disable:4786)

#include <iostream>
#include <map>
#include <functional>

using namespace std;

typedef void (*func)();

void fun1()
{
    cout << "a" << endl;
}

void fun2()
{
    cout << "b" << endl;
}

int main()
{
    std::map<int,func> m;
    m[1] = &fun1;
    m[2] = &fun2;
    m[1]();
    m[2]();
    return 0;
}

void a_get();
void b_get();
void a_set();
void b_set();

void get()
{
  if (a)
     a_get();
  else
     b_get();
}

void set()
{
   if (a)
      a_set();
   else
      b_set();
}

template <fun1, fun2>
{
  if (a)
    fun1;
  if (b)
    fun2;
}
template<&a_get, &b_get> get;
template<&a_set, &b_set> set;

template <void f1(), void f2>
class call_fun 
{	
        call_fun () {};
public:
	call_fun (char c) 
        {	
		if('A' == c)
		{
			cout << "call_fun: A selected" << endl;
			f1();
		}
		else
		{
			cout << "call_fun: not A selected" << endl;
			f2();
		}
	};
};
void fun11()
{
	cout << "Hello from fun11" << endl;
}

void fun12()
{
	cout << "Hello from fun12" << endl;
}

void fun21()
{
	cout << "Hello from fun21" << endl;
}

void fun22()
{
	cout << "Hello from fun22" << endl;
}


int main()
{
	call_fun<&fun11, &fun12> a ('A');
	call_fun<&fun11, &fun12> b ('B'); 
	
	cout << endl;

	call_fun<&fun21, &fun22> c('A');
	call_fun<&fun21, &fun22> d('B'); 

	return 0;
}