Another question about wrapper design, in function gperl_new_object() where an
new wrapper is newly created:
......obj = (SV *)g_object_get_qdata (object, wrapper_quark);
if (!obj) { ...... // created a hash obj = (SV *)newHV ();
_gperl_attach_mg (obj, object); g_object_ref (object);
// created a SV wrapper for the hash sv = newRV_noinc (obj);
sv_bless (sv, stash); ......}......
Why don't bless the HV directly, but instead creating another SV wrapping the
HV, and bless that SV instead?Why use noinc to create the wrapper? Shouldn't
the SV wrapper holding a reference for HV?
Thanks!
> Date: Tue, 18 Oct 2011 09:35:43 +0200
> From: kaffeeti...@gmx.de
> To: gtk-perl-list@gnome.org
> Subject: Re: generic refcounted object perl binding
>
> On 18.10.2011 04:49, YangXi wrote:
> > Why the SV wrapper for a GObject keeps alive until both are freed?
>
> This is so that we always hand out an SV referencing the same HV for the
> same GObject. Glib::Object allows you to store your own data directly
> in the referenced hash, and this mechanism makes sure that you will find
> this data again when you look at the same GObject later, with no need to
> store the SV in between.
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