Cancel construction of GObject
Is it possible to cancel construction in gobject-derived class? Lets say I have GMyObject derived from GObject. In its init function I need to spawn a thread. When that fails, I would like to cancel construction of the object (so that gobjectclass' finalize function would be called on the object and g_object_new would return null-pointer). I know I can create extra function, which would call g_type_new and spawn the thread then and destroy the object if it fails, but I would like my object to be instantiable by g_object_new and not force user to call extra initialization function and destroy the object if it fails. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Cancel construction of GObject
On 27 November 2010 11:14, Jaroslav Šmíd jardas...@gmail.com wrote: Is it possible to cancel construction in gobject-derived class? I don't think so. Lots of code (including code inside gobject) assumes that g_object_new() always returns a valid pointer. I handle this by having a more complicated init system. I have g_object_new() just doing basic mem alloc and setting up a start state, then I let parameters be set, then I have a virtual function called build(), which can fail, which constructs the full object. So make a subclass of GObject for your application (MyObject?) with a can-fail init system and make all your classes derive from that. My code is here, if you're curious: http://vips.svn.sourceforge.net/viewvc/vips/vips7/trunk/libvips/iofuncs/object.c?view=markup http://vips.svn.sourceforge.net/viewvc/vips/vips7/trunk/libvips/include/vips/object.h?view=markup John ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Cancel construction of GObject
On Sat, 27 Nov 2010 12:14:39 +0100 Jaroslav Šmíd jardas...@gmail.com wrote: Is it possible to cancel construction in gobject-derived class? Lets say I have GMyObject derived from GObject. In its init function I need to spawn a thread. When that fails, I would like to cancel construction of the object (so that gobjectclass' finalize function would be called on the object and g_object_new would return null-pointer). Have a look at the GInitable and GAsyncInitable interfaces. - Jannis ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Cancel construction of GObject
On 11/27/2010 05:32 PM, Jannis Pohlmann wrote: On Sat, 27 Nov 2010 12:14:39 +0100 Jaroslav Šmídjardas...@gmail.com wrote: Is it possible to cancel construction in gobject-derived class? Lets say I have GMyObject derived from GObject. In its init function I need to spawn a thread. When that fails, I would like to cancel construction of the object (so that gobjectclass' finalize function would be called on the object and g_object_new would return null-pointer). Have a look at the GInitable and GAsyncInitable interfaces. - Jannis ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list Cool, thanks. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
