Re: Cancel construction of GObject

[jcupitt gmail com]

On 27 November 2010 11:14, Jaroslav ÅmÃd <jardasmid 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