Re: [boost] Macro fo rBOOST_NO_NUMERIC_LIMITS_MAX_DIGITS10 or useBOOST_NO_NUMERIC_LIMITS_LOWEST

Subject: Re: [boost] Macro fo rBOOST_NO_NUMERIC_LIMITS_MAX_DIGITS10 or useBOOST_NO_NUMERIC_LIMITS_LOWEST
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2012-07-12 12:07:25

> -----Original Message-----
> From: boost-bounces_at_[hidden] [mailto:boost-bounces_at_[hidden]] On Behalf Of Paul A.
> Bristow
> Sent: Thursday, July 12, 2012 3:20 PM
> To: boost_at_[hidden]
> Subject: Re: [boost] Macro fo rBOOST_NO_NUMERIC_LIMITS_MAX_DIGITS10 or
> useBOOST_NO_NUMERIC_LIMITS_LOWEST
> 
> > -----Original Message-----
> > From: boost-bounces_at_[hidden]
> > [mailto:boost-bounces_at_[hidden]] On Behalf Of Marshall Clow
> > Sent: Thursday, July 12, 2012 3:02 PM
> > To: boost_at_[hidden]
> > Subject: Re: [boost] Macro fo rBOOST_NO_NUMERIC_LIMITS_MAX_DIGITS10 or
> > useBOOST_NO_NUMERIC_LIMITS_LOWEST
> >
> > On Jul 11, 2012, at 10:25 AM, Paul A. Bristow wrote:
> > >> On Jul 11, 2012, at 9:20 AM, John Maddock wrote:
> > >>
> > >>>> I have recently used BOOST_NO_NUMERIC_LIMITS_LOWEST to act as a
> > >>>> proxy for support of
> > >>>> numeric_limits<T>:: max_digits10 (as correctly suggested by John Maddock).
> > >>>>
> > >>>> Do we need yet another  new macro for this, say
> > >>>>
> > >>>> BOOST_NO_NUMERIC_LIMITS_MAX_DIGITS10
> > >>>>
> > >>>> or continue to use  BOOST_NO_NUMERIC_LIMITS_LOWEST as a proxy.
> > >>>>
> > >>>> I think the latter will suffice (despite its unfortunate name for this task).
> > >>>>
> > >>>> But I think an addition to the configuration macro reference docs would be useful.
> > >>>
> > >>> Actually, this is one C++11 macro that Marshall missed for renaming.
> > >>
> > >> I didn't touch that macro, because I didn't think it was a C++11 one.
> > >>
> > >> Looking back at the discussion from last month, I see a proposal to
> > >> add a new macro named BOOST_NO_NUMERIC_LIMITS_MAX_DIGITS10, and
> > >> when John asked for a patch, Paul contributed some bits, but not a
> > >> complete patch; and no one else
> did.
> > >>
> > >>> Maybe if we asked him nicely ;-)  he would volunteer to rename
> > >>> this one to
> > >> BOOST_NO_CXX11_NUMERIC_LIMITS?
> > >>
> > >> I don't think that this is a rename job.
> > >> If I've misread the discussion (or misunderstood the situation), please let me know.
> > >
> > > BOOST_NO_NUMERIC_LIMITS_LOWEST works as a proxy for
> > > BOOST_NO_NUMERIC_LIMITS_MAX_DIGITS10
> > >
> > > but there are other new things added at CX11 too, so really
> > > BOOST_NO_NUMERIC_LIMITS_LOWEST turns out to be a bad name.
> > >
> > > John suggests renaming BOOST_NO_NUMERIC_LIMITS_LOWEST  to
> > > BOOST_NO_CXX11_NUMERIC_LIMITS  (and I think this is a god idea to
> > > avoid adding the already long
> list
> > of macros).
> > >
> > > This macro BOOST_NO_CXX11_NUMERIC_LIMITS  will then deal with the
> > > need for BOOST_NO_NUMERIC_LIMITS_MAX_DIGITS10,
> > > BOOST_NO_NUMERIC_LIMITS_LOWEST  *and* all the other items added to numeric_limits at Cxx11.
> > >
> > > Hope this is clearer now.
> > >
> > > Paul
> > >
> > > PS And if this is done, we will need to update the docs.  I will do this if you wish.
> >
> > Ok, it's done (revision 79452).
> >
> > The new macro is named BOOST_NO_CXX11_NUMERIC_LIMITS, replacing
> > BOOST_NO_NUMERIC_LIMITS_LOWEST.
> > The old macro is still around, but set to the value of the new macro,
> > and is listed in the
> "deprecated
> > macros" section of the docs.
> >
> > Paul - please feel free to update the docs to explain how this works
> > (and update your code to use
> the new
> > macro, natch).

Docs updated and html rebuilt
Sending content: I:\boost-trunk\libs\config\doc\macro_reference.qbk  
Completed: At revision: 79456  

(in doing this I noted that the other two additions to numeric limits template for 16 and 32 bit
already have their own macros, so it would be logical to have a macro for max_digits10, so they are
all available individually or in a group using BOOST_NO_CXX11_NUMERIC_LIMITS.  But I suspect it's
not really worth it?

Paul

---
Paul A. Bristow,
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[phone]  07714330204
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