[C++-sig] implicitly_convertible / virtual base class
david.abrahams at rcn.com
Tue Jun 4 00:14:36 CEST 2002
From: "Achim Domma" <achim.domma at syynx.de>
> I realized this solution some minutes after sending the mail. First I
> thought I would have to write an implicitly_convertible for each class,
> derived from DrawableBase. But with 'bases<DrawableBase> defined and a
> conversion from DrawableBase to Drawable it works fine now. This solves
> of my problems.
> > Or, we could define
> > template <class T>
> > def_implicit(args<T>);
> I would prefer this one.
So far I am leaning towards an interface that works more like C++ (implicit
is the default, "explicit_" is explicitly specified). I think people
writing wrappers will typically be looking over their C++ interface, so it
would be most natural to write:
> I have no problem writing down that the ctor should
> be available for implicit conversion, but it would be much more intuitive
> do it directly on the class, than to specify it somewhere else via
> > Oh, BTW, patches to implement this would be welcome ;-)
> I'm developing in C++ for some years now, but I fear it's not good enough
> for boost. Anyway, if you think it's not to hard to do, I would try it at
> least. Could you give me a starting point?
It would be faster to implement it myself. However, the documentation will
be a PITA as usual. Would you like to contribute a doc patch?
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