Re: [boost] [C++0x] More config macros needed

Subject: Re: [boost] [C++0x] More config macros needed
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-05-12 17:11:24

Beman Dawes wrote:
On Monday, May 11, 2009 10:15 PM
>
> GCC 4.3 and even more so 4.4 have implemented significant portions of
> the C++0x core language, and provide lots of C++0x standard library
> components too.
>
> Microsoft 2010 beta 1 will ship "real soon", and it too will have some
> major C++0x core language features, and also some C++0x standard
> library components.
>
> Thus we need more config macros, particularly those aimed at the
> standard library. A possible approach:
>
> BOOST_NO_CONCEPTS     // needed to tell if headers have been
> conceptized
>
> BOOST_NO_*_HDR             // for each new C++0x header; * is
> name of header
>
> For example, BOOST_NO_CHRONO_HDR is defined unless header
> <chrono> is present.

I noticed the need for such macros, too, at BoostCon.  I was thinking we need one for each feature.

   BOOST_NO_AUTO
   BOOST_NO_DECLTYPE
   BOOST_NO_REFREF
   BOOST_NO_VARIADICS
   etc.

The only reason I can think of to provide one for each header is so that Boost headers can include standard headers rather than compatibility code.  Is that what you had in mind?  If so, then the header macros should only be undefined when the corresponding header is complete.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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