Re: Function pointer casts

[Morten Welinder <mortenw gnome org>]

> This code casts GCompareFunc to GCompareDataFunc.  As I understand, casting
> function pointers in C is not allowed.

You're right, of course, but considering that the signal code
depends heavily on casting function pointers with no obvious
completely standard-sanctioned substitute, there's really
no reason to single out this particular cast.  In practice
it works just fine anyway where you are likely to get
glib/gobject to run anyway.

The same problem occurs in any code using dlsym, such
as GModule.  To use that you need to cast a data pointer to
a function pointer which isn't allowed (unless the thing you
cast is a null pointer constant and then it isn't really that
interesting).

Morten