Re: [boost] [config] BOOST_STATIC_CONSTEXPR in C++11 vs C++14

Subject: Re: [boost] [config] BOOST_STATIC_CONSTEXPR in C++11 vs C++14
From: John Maddock (jz.maddock_at_[hidden])
Date: 2017-08-22 18:03:31

On 22/08/2017 17:18, Gary Furnish via Boost wrote:
> I'd take a look at making something like BOOST_CONSTEXPR_AND_CONST
> similarly to BOOST_CONSTEXPR_OR_CONST using BOOST_CXX14_CONSTEXPR.
> See http://www.boost.org/doc/libs/1_65_0/libs/config/doc/html/boost_config/boost_macro_reference.html
> But I'd name it something like BOOST_COMPILETIME_CONSTANT because
> BOOST_CONSTEXPR_AND_CONST would seem to imply always constexpr and
> const, which is not what you want.  Really though you want to get
> other people who are more knowledgeable then I am involved if you want
> to add a cross-library macro, so maybe make one for your use case to
> test it.

Actually I think it's a lot simpler than this: when it was added, 
|BOOST_CONSTEXPR_OR_CONST did what it says, and what it's documented to 
do - namely declare something const or constexpr (which implied const at 
the time).  Subsequently it's been broken by C++14 where constexpr no 
longer implies const.  It just needs updating is all, and fixing that 
will automatically fix ||BOOST_STATIC_CONSTEXPR as well.  See 
https://github.com/boostorg/config/pull/182.|

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