[Xcb] Xevent and XCBEvent

[Vincent Torri]

Hey :)

Is there any improvement about that problem ? I've almost finish a first
version of ecore xcb and i need this stuff

Vincent

On Mon, 23 May 2005, Barton C Massey wrote:

> Ah, I see.  I'd forgotten how C is broken, sadly.  Thanks
> much for the clarification.
>
>     Bart
>
> In message <1116896492.6929.24.camel at id.minilop.net> you wrote:
> > > > So an extra pad field could be produced in that manner by re-emitting
> > > > the entire structure inside sizeof.
> > >
> > > Why re-emit it rather than just reference it by type or tag?
> > > I'm not getting it...
> >
> > I know I wasn't particularly clear in describing this suggestion; let me
> > re-state it. If there's an alternative option I've missed I think it
> > will be easier to see given the sequence of my reasoning.
> >
> > We currently have some
> >
> >         typedef struct {
> >                 CARD8 kind;
> >                 CADR8 bar;
> >                 CARD16 sequence;
> >                 CARD32 baz;
> >         } XCBFooEvent;
> >
> > The above structure is 8 bytes, and we want to pad it to 32; given
> > knowledge of these numbers at code-generation time, we can do the
> > subtraction and insert
> >
> >                 char pad[24];
> >
> > at the end. But we don't currently know those numbers at code-generation
> > time. (I think we should, if only so we can generate documentation. But
> > I don't think it's a priority right now.) So we could output a temporary
> > copy of the structure without padding, then output the real one using
> > the first to get the padding right:
> >
> >         struct _XCBFooEvent {
> >                 CARD8 kind;
> >                 CADR8 bar;
> >                 CARD16 sequence;
> >                 CARD32 baz;
> >         };
> >
> >         typedef struct {
> >                 CARD8 kind;
> >                 CADR8 bar;
> >                 CARD16 sequence;
> >                 CARD32 baz;
> >                 char pad[32 - sizeof(struct _XCBFooEvent)];
> >         } XCBFooEvent;
> >
> > But it's silly to pollute namespaces that way. So the best I can think
> > of is describing the structure type inline in the sizeof invocation.
> >
> > Am I missing an option?
> >
> > --Jamey
> >
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> > http://lists.freedesktop.org/mailman/listinfo/xcb
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