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

Subject: Re: [boost] quince: queries in C++ expressions
From: Mostafa (mostafa_working_away_at_[hidden])
Date: 2014-07-21 22:33:31

On Mon, 21 Jul 2014 19:25:12 -0700, Michael Shepanski  
<mps_at_[hidden]> wrote:

> On 22/07/2014 8:09 AM, Mostafa wrote:
>>
>> That's what I figured, and Boost.Preprocessor could be used to take  
>> care of the variadic templates. My only concern, and maybe Michael can  
>> chime in here, would be the use of temporaries. In C++11 they could be  
>> moved, but in C++03 they may have to be copied, and I wonder if that  
>> would become costly with quince's design.
>
> Re temporaries: no alarm bells are going off in my head. I suspect that  
> all that's at issue are small-scale optimizations that shouldn't  
> influence us unless measurement shows otherwise.

If those temporaries are quince types, they can even be moved in C++03  
using Boost.Move.

> Overall comments about replacing variadic templates with  
> Boost.Preprocessor and decltype with Boost.TypeOf:
>
> - I experienced some difficulties with internal compiler errors, and  
> other discrepancies between compilers. I suspect that a change to  
> different mechanisms would produce a different set of such pragmatic  
> problems. It may very well be that Boost.Preprocessor and Boost.TypeOf  
> lead to *fewer* problems than variadic templates and decltype -- but the  
> latter problems have all been worked around already.
>
> - I do like the brevity of expression in C++11.

No arguments there.