elaborating more;-

the Fptr which is returned from the function points to a function which is a member function of a class

Code:
//compiled using devcpp (GCC compiler)
//this code shows how to return address of global function (add and subtract)
//want to know how to return address of a member function of a class (tAdd and tSubtract)
#include <cstdlib>
#include <iostream>

using namespace std;

int add(int a, int b);
int subtract(int a,int b);

class Temp
{
 public:
        int tAdd(int,int);
        int tSubtract(int,int);
//getFPtr will take a const char and return a function pointer 
        int (*getFPtr(const char opcode))(int,int);
 };

int main(int argc, char *argv[])
{
    Temp t;
    cout<<(t.getFPtr('-'))(20,10);//calling a function which returns a fptr
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

int (*Temp::getFPtr(const char opcode))(int,int)
{
     cout<<"int (*Temp::getFPtr(const char opcode))(int,int)"<<endl;
     if(opcode == '+')
     return &add;
     else if (opcode == '-')
     return &subtract;
}
int add(int a, int b)
{
    return a+b;
}

int subtract(int a,int b)
{
    return a-b;
}