Comments on: GObject Private Data (again)

By: Tim Janik

Tim Janik — Wed, 30 Nov -0001 00:00:00 +0000

Mark, what you say about the offset is not true.
For two objects of different types, both deriving from a common parent, (say P<-A and P<-B), the offsets for getting at the P-private data are likely to be different for instances A*a; and B*b; simply because sizeof(A) is most often != sizeof (B). that’s why gtype.h only provides g_type_instance_get_private() (and because of other nastiness during object construction).

By: Mark McLoughlin

Mark McLoughlin — Wed, 30 Nov -0001 00:00:00 +0000

Ah, excellent point – I hadn’t considered subtypes at all.

By: Philip Van Hoof

Philip Van Hoof — Wed, 30 Nov -0001 00:00:00 +0000

Are these *priv-data backwards ABI compatibility issues documented or explained? If not, somebody should IMHO really do that :p. I can imagine new libraries (like libsexy) will be developed. It would be better if the authors or those new libraries make sure they make the right decisions about *priv-data handling.