Function behind the constructor

SoundCardDevice::SoundCardDevice( const char* deviceName,
Sptr < Fifo < Sptr<SipProxyEvent> > > inputQ,
Sptr < Fifo < Sptr<SipProxyEvent> > > outputQ )
: ResGwDevice( deviceName, inputQ, outputQ ),
audioStack( 0 ),
inRtpPkt( 0 ),
ringbackFd( -1 )
{

function here...

}


I know this is a constructor, but what does it mean when functions:

ResGwDevice( deviceName, inputQ, outputQ ),
audioStack( 0 ),
inRtpPkt( 0 ),
ringbackFd( -1 )

included at the end of it?

That's an initialization list, each of the members are initialized with the value in the parentheses:

Code:

---

class test {
  int a, b, c;
public:
  test()
    : a(0), b(0), c(0)
  {}
};

---

The above constructor could also be written as:

Code:

---

test()
{
  a = 0;
  b = 0;
  c = 0;
}

---

-Prelude

int i = 10; //is initialize

int i;
i = 10; //is assignment.

The first one in the previous post is initialization and second one is assignment. You would get into lot of situations in c++ where you would not be allowed to assign but only initialize.. for eg constants members :)

PS: Please re-visit your previous post regarding
"Sptr<CallId> myId meaning ", I have tried to explain it better