Function pointers to member functions

[Nobody/Anonymous]

#include <iostream>
#include <cstdlib>

class foo
{
public:
    int bar(int i){return i;}

};

int main(int argc, char *argv[])
{
    int (*fnPtr)(int i);
    foo f;
    fnPtr = &foo::bar;
    cout << (*fnPtr)(3);
   
    system("PAUSE");
}

compiler output:
D:\Dev-Cpp\Untitled1.cpp [Warning] In function `int main(int, char **)':
15 D:\Dev-Cpp\Untitled1.cpp converting from `int (foo::*)(int)' to `int (*)(int)'

i copied this code from a tutorial, it SHOULD work, how can i disable the compiler warning, or get it to work?

[Nobody/Anonymous]

Ah Figured  it out.

[Nobody/Anonymous]

The wraning is there for a reason... you can't have a pointer to a member function without associating it with the class the member function is in. Whatever tutorial teaches you otherwise is wrong. The correct way to do it is as follows:

#include <iostream>
#include <stdlib.h>

class foo
{
public:
    int bar(int i) { return i; }
};

int main(int argc, char *argv[])
{
    int (foo::*fnPtr)(int i);
    foo f;
    fnPtr = &foo::bar;
    cout << (f.*fnPtr)(3) << endl;
   
    system("PAUSE");
    return 0;
}