class and opCall

[BLS]

Hi,
in another context I ask what this piece of C++ code means ...
//C++
CPoint = {0}

bb explains that I can use :
CPoint p = {0,0};
Jarret adds
....except that if this isn't a static struct declaration, you have to 
write:
CPoint p = CPoint(0,0)
// Well I talked about a class instead a struct, but nevertheless

Okay, let's assume that my point class has three member vars as shown in 
the example.
How the compiler knwows, which member I mean ?
I think I have to implement opCall  explicit ...
class CPoint
{

   static CPoint opCall(int _x, int _y)
   {
     CPoint cp;
     cp.x = _x;
     cp.y = _y;
     return cp;
   }
private:
   int x;
   int z;  // extra member, just to demonstrate what I mean.
   int y;
}
...
to use CPoint as parameter

void movePoint(CPoint p, bool changecolor = true)
{
// do something
}
//use it as
movePoint(CPoint(10,2));

Do I miss something here ?

Next :
C++
class CFont
{
public:
   HFONT m_hFont;
   operator HFONT() {return m_hFont;}
}

Actually D doen't support this kind of operator overloading.
Do you see a chance that  opCall in conjunction with alias is a 
reasonable workaround ?

given opCall  :
opCall() {return this.m_hFont;}

and than something similar to :
alias opCall()  HFONT() ; // :( don't have the syntax in my mind

Thanks in advance Bjoern