[Qt-interest] About QScopedPointer

[Mihail Naydenov]

struct IUnknownRelease 
{
    static inline void cleanup(IUnknown* p)
    {
        if(!p)
            return;

        p->Release();
    }
};

QScopedPointer<IamComInterface, IUnknownRelease> sp(p);

;)

----- Original Message ----
> From: Constantin Makshin <cmakshin at gmail.com>
> To: Qt Interest <qt-interest at qt.nokia.com>
> Sent: Sun, May 15, 2011 7:24:21 PM
> Subject: Re: [Qt-interest] About QScopedPointer
> 
> AFAIR, all COM objects are meant to be destroyed using their Release() 
method  
>and not C++'s "delete" operator. So using QScopedPointer doesn't seem to be a  
>[very] good idea.
> 
> On Friday 13 May 2011 19:10:28 Mihail Naydenov  wrote:
> > ----- Original Message ----
> > 
> > > From: Thiago  Macieira <thiago at kde.org>
> > > To: qt-interest at qt.nokia.com
> > >  Sent: Fri, May 13, 2011 4:33:00 PM
> > > Subject: Re: [Qt-interest] About  QScopedPointer
> > > 
> > > On Friday, 13 de May de 2011 03:33:45  Mihail Naydenov wrote:
> > > > Problem is  sometimes the pointer  is not initialized when constructed.
> > > > 
> > > >  It  is later initialized by some func(Data** data)
> > > > 
> > > > Now I will have  to do
> > > > 
> > >  > Data* p = NULL;
> > > > 
> > > > func(&p);
> >  > > 
> > > > QScopedPointer<Data, Release> sp(p);
> >  > > 
> > > > // use sp,  forget about p
> > > > 
> > > > Which is a bit cumbersome
> > > 
> > > Indeed.  But  you're attacking this problem from the wrong angle. You 
>should 
>
> > > change func  to be:
> > > 
> > >      func(QScopedPointer<Data>  &p)
> > > 
> > > So you  can just do:
> > >      QScopedPointer<Data>  d;
> > >     func(d);
> > 
> > Its is not my function,  of course. It is COM's CoCreateInstance()
>