reduce_by_key

[jpola]

Hello,

I'm looking for reduce_by_key algorithm. Is it somehow possible to obtain it using transform and reduce functions.

Kuba.

[kylelutz]

Currently there is no reduce_by_key() algorithm in Boost.Compute.

Calling transform() will apply a function to each element of an input range and write the result to an output range. The reduce() algorithm will apply a binary function to each element in a range and write the final reduced value to a result location. I don't think either of these can be used for this particular purpose.

[jpola]

That's true what you've written. It would be great to have it in compute project.

[jszuppe]

It can be closed, see #477.