On Saturday November 3 2007 07:55, Vladimir Batov wrote:
Marc,
Just uploaded v0.6 which supports building of two separate class hierarchies -- separately for interfaces and for implementations as described in GoF Pattern Bible for the Bridge pattern.
The interface hierarchy is built as
struct Base : public pimpl<Base>::pointer_semantics {...};
struct Derived : public Base {...}
etc.
The implementation hierarchy is still hidden and is built as
template<> struct pimpl<Base>::implementation {...};
template<> struct pimpl<Derived>::implementation : public pimpl<Base>::implementation {...};
etc.
Marc, let me know if that looks right for your purpose as I myself have no use for deep inheritance trees to test them out. <snip>
I've been more thinking about the attached scenario. I'm not sure it's worth it, since the savings don't seem to be large compared to hand-written code, and the need to spell out the forwarding Base(implementation*) is a bit ugly (maybe that can be solved in C++0x?), but that should give you the idea. Maybe someone better at template magic than I am can coerce this into a workable thing. The need for verboseness in referring to pimpl<Class>::implementation strikes me as a likely candidate for improvement, e.g. Thanks, Marc -- Marc Mutz - marc@kdab.com, mutz@kde.org - Klarälvdalens Datakonsult AB Platform-independent software solutions - www.kdab.com info@kdab.com