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From: Arkadiy Vertleyb (vertleyb_at_[hidden])
Date: 2006-01-14 07:57:25

"Andy Little" <andy_at_[hidden]> wrote

> For each type, typeof registration is quite a heavyweight process,

Why is it heavyweight? Registering a type is just creating a couple of
template specializations -- that's it.

> so I want to
> only register those types that I Really need to. Currently this is not
the case
> so I get for example mpl::math::zero, mpl::math::denominator, etc etc,
etc, etc
> and the kitchen sink registered for me though I dont need registration for
> vast majority of these types, also bearing in mind that space in the
> vector is limited,

What do you mean by the "space in the typeof vector"? How is it related to
the number of registered types?

> so I dont think registering everything is a practical way to
> do it.

What do you mean by everything? I would recommend registering types and
templates that can be present in the types used by your users.

> It must be possible for me the user to be able to register each type
> (only if it becomes necessary.)
> Of coures the problem comes then because mpl works in terms of concepts
> than type-names, so I might get a int_, a integral_c, or a long_. , a
> rational or a simplified_rational. I dont really know a clean solution
to the
> problem of what to register if I use mpl, (maybe 'per concept
> would be OK) but I dont think registering everything at one go is a good
> solution.

I would register your own types/templates leaving mpl types/templates to
either mpl authors or users. Then again, you could wear an mpl hat and
register its types, but I don't think this should become a part of your


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