Re: padding to class structures

[James Henstridge <james daa com au>]

George wrote:

> I was talking to anders and realized that we may want to add signals and/or
> virtual methods in the future to widgets, and it'd be nice to do so without
> breaking binary compatibility.  So the idea would be to add padding to all
> the (non-deprecated) class structures in libgnome/libgnomeui for this.  This
> doesn't take up much memory since there is only once class structure per
> class so that's not an issue.
>
> But it does break bin-compat a bit now.  Though looking at the schedule we
> can still do this correct?  It would only break bincompat for people who
> derive the widgets, so I don't think it'd even be such a problem.
>
> If I don't hear back within a day or two, I'll commit it.
Note that for signals that don't require a class implementation (eg. 
ones used purely for notification), you don't need a slot in the class 
structure at all -- you can just pass NULL for the class closure (or 0 
as the signal offset).  It is still possible to connect to the signal 
and everything.

James.

--
Email: james daa com au
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