Failure to Distinguish Overloading from Default Initialization

Hi all,
I got a code in the net.
I executed that one , it is working fine..I did not understand how it is working..
can anybody explain me?
code is..

c12.h

Code:

#ifndef C12_H
#define C12_H
#include <iostream.h>
class C1 {
  public:
    void f1( int arg = 0 ) {cout<<"inside f1"<<endl;}
    //
};

class C2 {
  public:
    void f2() {cout<<"inside f2"<<endl;}
    void f2( int) {cout<<"inside f2(int)"<<endl;}
    // ...
};

#endif

c12.cpp file

Code:

// Failure to Distinguish Overloading from Default Initialization 


#include "c12.h"

int main() {
	C1 c1;
	c1.f1(0);
	c1.f1();


	C2 c2;
	c2.f2(0);
	c2.f2();

	//void (C1::*pmf1)() = &C1::f1; //error!
	void (C2::*pmf2)() = &C2::f2;
	
	return 0;
}

Regards,
sharmila.

 

Hi Shabbir,
My doubt is if we uncomment void (C1::*pmf1)() = &C1::f1; it showing error?But the samething is working fine for C2..the only difference is f1() is taking default argument.The error it is showing is
error C2440: 'initializing' : cannot convert from 'void (__thiscall C1::*)(int)' to 'void (__thiscall C1::*)(void)'
Here it is not recognizing default argument..why it is so..


Thanks and regards,
sharmila.

 

Hi shabbir,
It will happen in overloading.But for class C1 we did not write any constructor, so it will invoke default one.Here it is able to create C1 object but unable to assign function for function pointer.

Regards,
sharmila.