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 15:14:13

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/

?  I meant to suggest that they could be found there with:

>> while in the working directory produced by `svn checkout` on the
>> above svn directory.

Of course maybe that was not plain enough.  If so, sorry.  I will
try to remember to be more explicit.

-regards,
Larry