Re: [boost] [pimpl] Proposal. Determining interest.

From: Vladimir Batov (batov_at_[hidden])
Date: 2007-11-03 02:55:05

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.

Best,
Vladimir.

> Marc,
>
> I have re-read the Bridge pattern in GoF Pattern Bible. Their example is
> just what you describe in your example. I agree that having/supporting
> two separate hierarchies is an elegant solution to a few problems. Let
> me think how pimpl<> might support that.
>
> Best,
> Vladimir.