Re:

[Yann Leydier <yann leydier info>]

You can also use std::tr1::shared_ptr. This not (yet) standard C++ but 
is present in most compilers (gcc 4, visual studio 2008 and 2010…).

When C++0x is released, you'll just have to replace "std::tr1" with "std::".

yann

On 28/01/11 15:19, Culpian Camilo Martin wrote:
> El vie, 28-01-2011 a las 15:11 +0100, Krzesimir Nowak escribió:
> > 2011/1/28 Culpian Camilo Martin<camiloculpian gmail com>:
> > > El vie, 28-01-2011 a las 14:46 +0100, Krzesimir Nowak escribió:
> > > > 2011/1/28 Culpian Camilo Martin<camiloculpian gmail com>:
> > > > > ok, i'll try it, i have had some troubles doing this:
> > > > >
> > > > > class foo
> > > > > {
> > > > >         static ref_ptr<foo>  create
> > > > >         (
> > > > >                 return ref_ptr<foo>(new foo());
> > > > >         );
> > > > >         foo();
> > > > >         ~foo();
> > > > >         ref_ptr<foo>  set_something()
> > > > >         {
> > > > >                 //set something
> > > > >
> > > > >                 return ref_ptr<foo>(this);
> > > > >                 //for using foo->set_something()->set_something();
> > > > >                 // oviously the ref_ptr delete "this", and cause a segfault
> > > > >                 // any idea how can avoid this?
> > > > >         }
> > > > > }
> > > >
> > > > Would be good to show what is this ref_ptr class...
> > > >
> > > > If the below code segfaults then maybe copy constructor of ref_ptr
> > > > does not increment reference count.
> > > >
> > > > ref_ptr<foo>  f = foo::create();
> > > > f->set_something()->set_something();
> > >
> > > the problem is not when i do this:
> > >
> > > ref_ptr<foo>  f = foo::create();
> > > f->set_something()->set_something();
> > >
> > > the problem is when i do this:
> > >
> > > class foo_b : public foo
> > > {
> > >         static ref_ptr<foo_b>  create()
> > >         {
> > >                 return ref_ptr<foo_b>(new foo_b());
> > >         }
> > >         foo_b();
> > >         ~foo_b();
> > > }
> > >
> > > when i do:
> > >
> > > foo_b foob = foo_b::create();
> > > foob->set_something(); //here ref_ptr delete the object member class
> > > foo... this is what i can't do right.
> >
> > Now I see. An option would be:
> > 1. returning void instead of ref_ptr to this.
> > 2. coding the reference count inside foo_b, instead of in ref_ptr.
> >
> > I would opt for first solution.
> yes, but if i extend from Glib::Object, and i use Glib::RefPtr, wouldn't
> be a better and elegant solution? or it is not possible?
>
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