Re: [Boost-users] Need boost's help with poor design

From: Robert Dailey (rcdailey_at_[hidden])
Date: 2008-03-26 11:51:37

On Wed, Mar 26, 2008 at 9:53 AM, Steven Watanabe <watanabesj_at_[hidden]>
wrote:

> AMDG
>
> Robert Dailey wrote:
> > I love the logic presented here. boost::variant has always been
> > confusing to me, but I took the time just now to read over the
> > documentation for it a few times and I get it now. However, the issue
> > still remains in how to organize all of my signals. In your example
> > you have all of the signals manually typed out into separate
> > variables, whereas I would rather have them in some sort of container,
> > such as a map.
>
> How about this:
>
> typedef boost::mpl::vector<WalkPacket, ChatPacket, QuestPacket>
> packet_types;
> typedef boost::mpl::transform<boost::signal1<void, _> >::type signals;
> typedef boost::mpl::inherit_linearly<signals, static_visitor<>,
> mpl::inherit<_, _> >::type SignalVisitor;

Would you mind going over what exactly this is doing? I'm having a hard time
wrapping my head around it. The documentation isn't helping much either, as
I've never used these before and the descriptions are very confusing.

I also didn't see a version of mpl::transform that only took 1 template
argument. Is this correct?