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Subject: Re: [boost] [preprocessor] Variadics suggestion
From: Dave Abrahams (dave_at_[hidden])
Date: 2012-10-10 10:53:18

on Wed Oct 10 2012, Paul Mensonides <> wrote:

> On 10/9/2012 6:07 PM, Dave Abrahams wrote:
>> What's the point of showing REPEAT here? It doesn't seem to be used
>> below. Are you just illustrating that you can build REPEAT and ENUM
>> using the same foundation?
> It is just a tacit illustration of generality and reusability. Doing
> the same ala Boost.Preprocessor has far greater implications. In fact,
> in Boost.Preprocessor, there are a relatively few number of core
> algorithms--each of which has its own recursion state. Then there are
> a few derived algorithms which are hacked to look like they use one of
> those states. Lastly, there are a bunch of algorithms implemented in
> terms of the more low-level ones. None of those are reentrant. The
> above redirection, on the other hand, has no usability consequences
> other than that a natively built REPEAT or ENUM would be /slightly/
> faster due to not passing around and invoking the separators.

Very nice :-)

Sorry, TL;DR on the rest of the message right now but I will try to come
back to it in coming days.

Dave Abrahams
BoostPro Computing                  Software Development        Training             Clang/LLVM/EDG Compilers  C++  Boost

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