Mister Math is wanted!

[Ilya Yaroshenko via Digitalmars-d-announce]

On Friday, 27 February 2015 at 09:27:49 UTC, Ilya Yaroshenko
wrote:
>> Unfortunate overlap in functionality is unfortunate.
>>
>> $ git grep -i kahan
>> std/algorithm/iteration.d:$(D sum) uses the $(WEB 
>> en.wikipedia.org/wiki/Kahan_summation,
>> std/algorithm/iteration.d:Kahan summation) algorithm.)
>> std/algorithm/iteration.d:            return sumKahan!E(seed, 
>> r);
>> std/algorithm/iteration.d:// Kahan algo 
>> http://en.wikipedia.org/wiki/Kahan_summation_algorithm
>> std/algorithm/iteration.d:private auto sumKahan(Result, 
>> R)(Result result, R r)
>> $ _
>>
>>
>> Andrei
>
> Would one of the following solutions be fortunate ?
>
> I. Use alias of fsum!(Summation. Appropriate) for floating 
> version of std.algorithm.sum.
>
>     Appropriate algorithm performs D Pairwise summation for 
> random access ranges.
>     Otherwise performs D KBN summation of floating point and 
> complex numbers and
>     Kahan summation of user defined types.
>
> or
>
> II. Move this submodule to std.algorithm.iteration.
>
> or
>
> III. Remove Kahan (including KBN and KB2) and Pairwise 
> algorithms from fsum, and use only Precise algorithm for 
> std.numeric.

Probably, I have found good solution. Summator struct can be
represented in std.numeric and std.algorithm.sum can be extended
by the new functionality. So there will be no overlap in
functionality.