Re: [boost] [config] Macro for null pointer

Subject: Re: [boost] [config] Macro for null pointer
From: Jeffrey Lee Hellrung, Jr. (jeffrey.hellrung_at_[hidden])
Date: 2012-12-07 17:06:06

On Fri, Dec 7, 2012 at 1:54 PM, Marshall Clow <mclow.lists_at_[hidden]> wrote:

> On Dec 7, 2012, at 12:14 PM, Daniel Russel <drussel_at_[hidden]> wrote:
>
> >
> >> Well, I think some individuals here (I'd put myself in that camp) are
> >> opposed to injecting anything into the global namespace if it can be
> >> helped, and here it certainly can be helped. So if we add a nullptr
> >> emulation in Boost, it's going to have to be paired with a using macro,
> a
> >> different name (i.e., boost::nullptr_), or both. If no one will use this
> >> utility given the latter imperfections, I'm fine with just dropping the
> >> proposal altogether and everyone can go back to using NULL or C++11.
> > Just to put in my vote for not putting anything in the global namespace
> but providing a "BOOST_USING_NULLPTR" macro. We keep our nullptr emulation
> in our library namespace too and would gladly switch to a boost one.
>
> We've already got:
>         BOOST_NO_CXX11_NULLPTR
>
>
> http://www.boost.org/doc/libs/1_52_0/libs/config/doc/html/boost_config/boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_c__11_features_not_supported

Yes, the definition of BOOST_USING_NULLPTR depends on whether
BOOST_NO_CXX11_NULLPTR is defined :) It's just a convenience macro
equivalent to

#ifndef BOOST_NO_CX11_NULLPTR
using ::boost::nullptr;
#endif

- Jeff