[omniORB] basic parameter passing question

[Luke Deller]

On Thu, 2005-12-01 at 11:37 +0100, Lolke B. Dijkstra wrote:
> Again:
> 
> 1.  isdn::BChannelControlClient_var retval = bchan->getControl();
> 2.  return retval._retn();
> 
> 1. the call to bchan->getControl() returns a pointer to an object that 
> is that assigned to retval so reval becomes the owner

No, in Anthony's code bchan->getControl() returns a reference to a _var
object, not a _ptr.  The constructor of retval will actually duplicate
the contained object reference for itself.

> 2. you return the internal pointer and instruct retval to give up ownership
> 
> 
> In:
> 
>    return isdn::BChannelControlClient::_duplicate(bchan->getControl());
> 
> you also call bchan->getControl() but you do not assign the pointer to a ref, so nothing takes ownership of the return value of bchan->getControl() hence your leak.

Again, bchan->getControl() returns a _var& , not a _ptr, so this
explanation does not apply; it should not leak.

As I suggested in my last email, this confusion seems to have arisen due
to the unconventional return type in Anthony's getControl() function.

Regards,
Luke.


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