RE: [boost] Totally Cool

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-09-27 02:50:38

Mattias Flodin wrote:
> On Thu, Sep 26, 2002 at 08:03:30PM -0400, David Abrahams wrote:
> > Have I mentioned recently how totally cool MPL's lambda facility is?
> > I can't believe I can do things like this, even with MSVC6. 
> > It makes my metaprograms SO much easier to manage!
> >
> >      mpl::logical_and<
> >         is_reference_to_class<add_reference<mpl::_> >
> >       , mpl::logical_not<
> >             is_reference_to_args<add_reference<mpl::_> >
> >         >
> >      >
> 
> Yes, way cool, but with a syntax that could scare a full-grown man. :)

You missed the point - it's exactly the syntax that is totally cool :). Let
me try again:

    and_<
          is_reference_to_class< add_reference<_> >
        , not_< is_reference_to_args< add_reference<_> > >
        >

// "ideal" version, for comparison purposes:
//  is_reference_to_class( add_reference(_) )
//  && !is_reference_to_args( add_reference(_) )

Now that's cool, isn't it? :)

Aleksey