Re: [boost] typeof() substitute.

From: Anthony Williams (anthony.williamsNOSPAM_at_[hidden])
Date: 2002-10-30 06:22:10

Paul Mensonides writes:
 > 
 > ----- Original Message -----
 > From: "Anthony Williams" <anthony.williamsNOSPAM_at_[hidden]>
 > 
 > 
 > > David Abrahams writes:
 > >  >
 > >  > I'm at a seminar right now where Steve Dewhurst has presented his
 > >  > technique for implementing typeof. It has the nice feature that you
 > >  > only need to register UDTs, and the system is then able to cope with
 > >  > them in all other type contexts including arrays, pointers, function
 > >  > (pointers/references), etc., etc. This technique was also covered in a
 > >  > recent CUJ article. I imagine it /might/ save some significant amount
 > >  > of code in Boost.Lambda and Spirit's Phoenix extension to take
 > >  > advantage of this approach. I think implementing it with MPL would
 > >  > make it a lot easier. Thoughts?
 > >
 > > >From my memory of the CUJ article, I think you would need the
 > Preprocessor lib
 > > more than MPL. Maybe implementing it with the preprocessor lib and MPL
 > would
 > > actually make it work on some compilers :-)
 > 
 > Why would you need the PP lib?  I can't immediately recall anything from the
 > articles that suggests it off hand.  What are you referring to?

The length of the identifying number is limited by the number of expansions
Steve was willing to do --- this strikes me as a task for the preprocessor lib.

Anthony
-- 
Anthony Williams
Senior Software Engineer, Beran Instruments Ltd.
Remove NOSPAM when replying, for timely response.