pointer to member function

[mchome]

I want to use in my class a pointer to function.
I could not find a way.
This is a simple example that explains the difficulty:

class C{
  public:
    int First (int i, int j){return i;}
    int Second(int i, int j){return j;}
    int Fun(int);
};
int C::Fun(int i){
  int (C::*pFun)(int, int);
  if(i==1)
    pFun=&C::First;
  else
    pFun=&C::Second;
  return pFun(1,2); //ERROR
}

class C{
  public:
    int First (int i, int j){return i;}
    int Second(int i, int j){return j;}
    int Fun(int);
};
int C::Fun(int i){
  int (C::*pFun)(int, int);
  if(i==1)
    pFun=&C::First;
  else
    pFun=&C::Second;
  return pFun(1,2); //ERROR
}

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this causes an error message to be displayed.
I cannot find a way to solve this. On the other hand the non-member version works correctly, as follows:

int First(int i, int j);
int Second(int i, int j);
int First(int i, int j){ return i;}
int Second(int i, int j){ return j;}
 
int main (int argc, const char * argv[])
{
  int i=1;
  float x;
  int (*fun)(int, int);
  if(i==1)
     fun=First;
  else
     fun=Second;
  x=fun(1,2); //OK
}

int First(int i, int j);
int Second(int i, int j);
int First(int i, int j){ return i;}
int Second(int i, int j){ return j;}

int main (int argc, const char * argv[])
{
  int i=1;
  float x;
  int (*fun)(int, int);
  if(i==1)
     fun=First;
  else
     fun=Second;
  x=fun(1,2); //OK
}

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Does anyone have any suggestion to give?