Re: [boost] Fusion and constexpr, C++11 support entirely broken on develop

Subject: Re: [boost] Fusion and constexpr, C++11 support entirely broken on develop
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2014-10-06 12:07:52

On 06/10/14 01:19, Agustín K-ballo Bergé wrote:
> On 05/10/2014 07:44 p.m., Mathias Gaunard wrote:
>> Hi folks,
>>
>> I recently decided to move all of my code to C++11, and I usually use
>> the develop version of each library so that I can have the latest
>> developments and can easily contribute.
>>
>> However, Fusion appears to be fundamentally broken on develop whenever
>> C++11 is enabled with GCC. It works fine with C++03.
>>
>> I don't think this is a situation that should ever happen; while develop
>> is for libraries undergoing development, it shouldn't be totally broken
>> either.
>>
>> In particular, the problem is that it uses BOOST_CONSTEXPR in contexts
>> where C++11-constexpr is invalid, but where it is valid in C++14.
>>
>> Should there be a separate BOOST_CONSTEXPR14 macro?
>
> This is the motive for https://github.com/boostorg/config/pull/39

I see.
So the solution is BOOST_RELAXED_CONSTEXPR?

What about when constexpr becomes even more relaxed?