Re: [boost] tuple benchmarks show marked differences from std::tuple(was Re: Interesting article on stack-based TMP

Subject: Re: [boost] tuple benchmarks show marked differences from std::tuple(was Re: Interesting article on stack-based TMP
From: Larry Evans (cppljevans_at_[hidden])
Date: 2012-10-24 20:22:39

On 10/24/12 14:14, Larry Evans wrote:
> On 10/24/12 14:09, Eric Niebler wrote:
>> On 10/24/2012 8:47 AM, Larry Evans wrote:
>>> The attached is the output .txt file produced by running:
>>>
>>> http://svn.boost.org/svn/boost/sandbox/variadic_templates/sandbox/slim/test/tuple_benchmark_run.py
>>>
>>> while in the working directory produced by `svn checkout` on the above
>>> svn directory.  It shows that with std::tuple, the compile times are 4
>>> times as long as with the "horizontal" tuple implementation which uses
>>> no preprocessing.  It also shows the "horizontal" is about the same as
>>> the "vertical" which does use preprocessing.  The "horizontal" trick
>>> (as Douglas Gregor has explained elsewhere) is to use multiple
>>> inheritance where the tuple elements are "paired" with the key to
>>> retrieve them.
>>
>> Without seeing the different header files referenced by your benchmark
>> program, or the tuple client code, it's impossible for anyone to draw
>> any conclusions from your numbers.
> 
> Are they not here:
>  the http://svn.boost.org/svn/boost/sandbox/variadic_templates
>  /sandbox/slim/test/
> 
OOPS.  Using -MMD compiler option found the above was missing:

  macros.benchmark.pp.hpp

Just added that.  Hopefully that's all the needed files.
Does it work for you now?

-regards,
Larry