[Evolution-hackers] Problems with camel

[Søren Hansen]

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ons, 02 03 2005 kl. 09:38 +0800, skrev Not Zed:
> > > And that means actually subclassing it, you can't just create it and
> > > override the virtual methods manually.
> > Ok, this might be more of a GObject question, but why? I realize now
> > that I'm not *supposed* to instantiate it, but I don't understand that
> > it fails.
> It has nothing to do with GObject.  It is unclear what failed, I
> presume it just crashed because you didn't build a concrete class.

Maybe it's just me being too much of and old school C programmer, but
"abstract", "concrete", "class" and "object" are not words in my regular
C programming vocabulary. Hence, I don't expect the programming langauge
or compiler to make sure that I can't create "instances" of "objects"
considered "abstract".=20
Obviously, there's something I don't understand.. :-)
The way I see it:
* CamelSession is a struct containing some fields.
* Among others, it contains a CamelSessionClass as the first field.
* A CamelSessionClass is a struct containing some fields.
* One of these fields is a function pointer called get_password.

When I create a new object of type CamelSession, I'd expect to be able
to access the get_password field, regardless of what it says in a
comment at the top of camel-session.h. :-)

> Well, you must also remember camel is just an internal library, it has
> incomplete documentation for external use, and neither is the api
> guaranteed to be stable yet.

I know. I'm doing this any becuase I want to get to know Camel. It makes
it easier to understand the Evolution code, I think.
Also, I'm considering using camel as is, and I'm willing maintain the
glue code, so it shouldn't be too much of a problem if I can understand
Camel.

--=20
S=C3=B8ren Hansen <sh@warma.dk>

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