Re: [sigc] sigc::trackable::~trackable() is not virtual

[Murray Cumming <murrayc murrayc com>]

On Thu, 2006-10-26 at 12:06 -0400, Paul Davis wrote:
> see this note in trackable.h:
> 
>   /*virtual ~trackable() {} */  /* we would need a virtual dtor for
> users
>                                    who insist on using "trackable*" as
>                                    pointer type for their own derived
> objects */
> 
> and smile :)

In case you haven't figured it out yet by looking at gtkmm:

The answer for you is probably to create your own base class that
derives in turn from sigc::trackable. That class can 
- derive virtually from sigc::trackable, solving your MI problems higher
up in the chain, probably meaning that you don't need to use virtual
inheritance anywhere else if it's just the ObjectBase class that it is a
common base.
- have a virtual destructor, allowing you to use it polymorphically.

For instance:
http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/classGlib_1_1ObjectBase.html
 
-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com