Re: [boost] [config] Macro for "using" type alias defects

Subject: Re: [boost] [config] Macro for "using" type alias defects
From: Raffi Enficiaud (raffi.enficiaud_at_[hidden])
Date: 2018-04-26 06:14:49

Le 26/04/2018 à 01:23, Andrey Semashev via Boost a écrit :
> On 04/26/18 01:50, Raffi Enficiaud via Boost wrote:
>> Hi all,
>>
>> I was wondering if there is any macro in Boost.Config for advertising 
>> the defect of the "using" support from the compiler.
>>
>> I was reported this:
>>
>> https://github.com/boostorg/test/pull/140
>>
>> and at the time I wrote the thing, I thought that those guards would 
>> have been enough:
>>
>> https://github.com/boostorg/test/blob/35c9acf5bd38d625ebd45cf940c5b9a19aa2295b/include/boost/test/tree/test_case_template.hpp#L145-L147 
>>
>>
>> (auto, tuple and variadic template sounds to me more difficult to 
>> support than "using" template alias).
>>
>>
>> Would it make sense to have BOOST_NO_CXX11_TYPE_ALIAS?
> 
> Why not just use a typedef?
> 
> I would say, using a macro check would make the code less maintainable.

It is not that I do not want your PR :) Here is why

* the macro checks are already there, but apparently they did not 
capture all I needed.
* the compiler advertises the support of several C++11 feature, but the 
support seams to be missing in other aspects. I would prefer removing 
this new feature of Boost.Test totally for such compilers as it may 
pull something else that I need to change, or mislead the users.
* For a developer, typedef or using should be equivalent as this part of 
the code is C++11.

Thanks!
Raffi