On Fri, Oct 23, 2015 at 10:29:04AM -0400, Frediano Ziglio wrote:
> It would be much better to define a public structure like
>
> struct CursorChannel {
> CommonChannel common;
> };
>
> and a private one (in cursor-channel.c) like
>
> struct CursorChannel {
> CommonChannel common;
> ... any field needed ...
> }
>
> and define the macro as
>
> #define RED_CHANNEL(Channel) (&(Channel)->common.base)
This kind of macros does not work as soon as you introduce another level
of inheritance:
struct SpecializedCursorChannel {
CursorChannel parent;
/* more stuff */
};
You cannot use your RED_CHANNEL macro to get a RedChannel from a
SpecializedCursorChannel instance.
Christophe
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