Int main inside a class

Question

Simple question, how can I run a program having main inside a class? I have a code:

MojSwiat2.cpp:

int Main::main() {
    // code 
    return 0;
}

And MojSwiat2.h:

class Main {
public:
    int main();
};
Main run;
int Main::main() { // with this I have error: function int Main::main(void) already has a body
    run.main();
} // and without I got unresolved external symbol _main referenced in function __tmainCRTStartup

Reason I need to do this: Accessing protected members of class from main

Answer 1

By defining a normal main that only contains a call to your other function. Like this:

int main(int, char**) {
    return Main().main();
}

Answer 2

int main(int argc, char* argv[])
{
    Main m;
    return m.main();
}

or if Main::main is declared static

int main(int argc, char* argv[])
{
    return Main::main();
}

Answer 3

You still need to define main.

class my_app {
   int main(int argc, char* argv[])
   {
      // ...
   }
}

my_app app;

int main(int argc, char *argv[])
{
   return app.main(argc, argv);
}