Re: [Boost-users] [boost] TTI library updated in the sandbox

Subject: Re: [Boost-users] [boost] TTI library updated in the sandbox
From: Dave Abrahams (dave_at_[hidden])
Date: 2011-02-06 16:14:32

Couple o' things:

On Sun, Feb 6, 2011 at 12:39 PM, Edward Diener <eldiener_at_[hidden]> wrote:
> Features of the update include support for the older gcc 3.4.2 and 3.4.5,
> finer-grained introspection for the basic macro metafunctions, documentation
> examples, better and tighter design, and better use of Boost MPL methodology
> ( metafunctions are now passed as lambda expressions and metafunction
> globbing has been removed from the two metafunctions where it previously
> existed ). You can view the changes in the History section of the
> documentation.

FWIW, passing lambda expressions instead of metafunction classes is a
trade-off: it's more expressive, but will lengthen compile times.  For
the implementation of a boost library, it's probably better to err on
the side of speed.

> The TTI library is based on the type_traits_ext portion of the Concept
> Traits Library, with improvements and additions, and also lifts
> functionality, for the purposes of orthogonality, from Boost.MPL regarding
> introspection of types and templates.

Orthogonality in what sense?  Duplicating functionality seems like the
opposite of orthogonality.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com