Re: [boost] quince: queries in C++ expressions

Subject: Re: [boost] quince: queries in C++ expressions
From: Damien Buhl (damien.buhl_at_[hidden])
Date: 2014-07-21 14:45:51

On 07/16/2014 07:49 AM, Michael Shepanski wrote:
> On 16/07/2014 2:14 PM, Mostafa wrote:
>> On Tue, 15 Jul 2014 18:27:07 -0700, Michael Shepanski
>> <mps_at_[hidden]> wrote:
>>
>>> Quince, and the application code that uses it, need a C++11 compiler,
>>> and a pretty new one too: see
>>> http://quince-lib.com/preparation/prerequisites.html#preparation.prerequisites.a_good_c_compiler
>>> . On the other hand there is no requirement on users to learn any
>>> C++11 features. You can access all of quince's features by writing
>>> C++03 code, and feeding it to your late-model C++11 compiler.
>>
>> Thanks. It would help if that was explicitly mentioned in the
>> documentation.
> 
> http://quince-lib.com/queries_in_c_expressions/the_quincessential_dot_points.html
> does say "Quince is written in C++11".  :)
> 
> 
>> (g++ by default uses C++03.)
> 
> That's interesting. You're right, of course, and yet I didn't exert any
> effort to make it accept C++11. On my ubuntu machine I use Boost.Build,
> my user-config.jam contains this line:
>     using gcc : 4.7 : g++-4.7 ;
> and somehow gcc gets invoked with the commandline option -std=c++11.
> 
> 
>> Out of curiosity, does the library *need* to be written in C++11, and,
>> if so, why?
> 
> If I tried to rewrite it in C++03, its length would multiply, if only
> because of the need to replace variadic templates by a combinatorial
> explosion of overloads.
> 
> But your question was about *need*, so perhaps the uses of decltype are
> more relevant. I do not think I could rewrite them to avoid decltype.
> (Maybe somebody else could, but I found it hard enough without any such
> constraint.)

As I'm currently doing it for Boost.Fusion, your macro to adapt the
types could take advantage of Boost.TypeOf which would be your
replacement for decltype :
http://www.boost.org/doc/libs/1_55_0/doc/html/typeof.html

But C++11-only is fine for me. :)

> 
> Regards,
> --- Michael
> 
> 
> _______________________________________________
> Unsubscribe & other changes:
> http://lists.boost.org/mailman/listinfo.cgi/boost