Re: [boost] Partial preprocessing for Fusion, et.al. (was: [netlib] Update: 0.9 will not be header-only)

Subject: Re: [boost] Partial preprocessing for Fusion, et.al. (was: [netlib] Update: 0.9 will not be header-only)
From: Dave Abrahams (dave_at_[hidden])
Date: 2010-12-06 09:59:46

At Mon, 6 Dec 2010 07:26:09 -0600,
Hartmut Kaiser wrote:
> 
> > On Dec 6, 2010, at 7:34 AM, "Hartmut Kaiser" <hartmut.kaiser_at_[hidden]>
> > wrote:
> > 
> > > What everybody is looking for is partial preprocessing, i.e. expansion
> > > of only some of the macros. Wave does not directly support this (does
> > > any
> > > preprocessor?)
> > 
> > Isn't that just a matter of injecting #undefs for the other macros?
> > Perhaps an easy hack to wave…
> 
> That won't do it. You want to properly handle #ifdef's (how do you
> do that with #undef'ed macros?) to keep platform specific code in
> place.

Then "expansion of only some of the macros" doesn't really capture
what you mean by "partial preprocessing." Am I missing something?

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