Re: [Boost-users] MPL Library

From: Cromwell Enage (sponage_at_[hidden])
Date: 2004-10-26 22:24:05

Hello, there!

--- Edward Diener <eddielee_at_[hidden]> wrote:
> I have bit the bullet and am attempting to get my
> head around the MPL library.  I realize there is a
> book out by Messieurs Abrahams and Gurtovoy, I
> believe, but I thought I would tackle the boost
> documentation first.  A few questions:
> 
> 1) Is the documentation up to date?

Not yet.

> 2) There are three separate documents to study, it
> seems, all giving information about the MPL library,
> a white paper circa 2002, a reference, and a
> mini-tutorial.  Is the information in these in sync
> with each other?

Not yet.  The differences between the MPL version
described in the white paper and the new one described
in the reference are summarized at
<http://www.mywikinet.com/mpl/mpl_1_32_changelog.html>.

> The reason I ask is that the white
> paper/mini-tutorial mentions if_<> and apply_if<>
but
> the reference does not mention them at all.  Are
they
> just understood intrinsic metafunctions that need no
> reference, or what?

The reference itself is not yet finished.  The white
paper will stand you in good stead wrt these two
metafunctions, as long as you replace all instances of
apply_if with eval_if, as per the changelog.

> 3) A number of the topics in the reference
> documentation mentioned in generalized overviews of
> the various sections have no specific links.  Does
> this mean that they were never implemented?  Seems
> dubious in a number of cases.

Mostly it's as I said above: unfinished reference
docs.  However, I'm trying to help out with at least
one topic--rational constants--that is not yet
implemented.

> I would seriously like to figure out how MPL works
> and play around with it, but I feel stymied with
what
> is in the boost docs.

Yeah, most of the knowledge I've acquired about MPL so
far came from studying the headers and playing with
the various metafunctions.  Right now I'm treating the
boost docs as supplemental aids.

Let me know how I can help further!

                              Cromwell Enage

                
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