C ++串联和分层运算符

Question

I would like to make a shortcut for making similar function calls

int g[2];

void f1() {
   g[0] = 1;
}

void f2() {
  g[1] = 2;
}

void (*f)();

Since functions f1, f2 have some common pattern, can I make a shortcut through C++ concatenation (##) and strinization (#) operator or something else to have something like:

for (int i = 0; i < 2; i++) {
   // have to do something to get the function name formed like f1, f2
   // and then assign f to f1 or f2 and call f, based on value of i
   // need help in this portion
}

Answer 1

template<size_t i>
void f()
{
    g[i-1] = i;
}

f<1>();
f<2>();

Answer 2

You can use the following approach by using an array of function pointers

for (int i = 0; i < 2; i++) {
   void ( *pf[] )() = { f1, f2 };
   pf[i]();
}