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Add mapreduce_single function #25051

Merged
merged 1 commit into from
Jan 4, 2018
Merged

Add mapreduce_single function #25051

merged 1 commit into from
Jan 4, 2018

Commits on Jan 3, 2018

  1. Add mapreduce_single function 

    Since the demise of `r_promote` in #22825, there is now a type-instability in `mapreduce` if the operator does not give an element of the same type as the input. This arose during my implementation of Kahan summation using a reduction operator, see: JuliaMath/KahanSummation.jl#7

This adds a `mapreduce_single` function which defines what the result should be in these cases.
    @simonbyrne
    simonbyrne committed Jan 3, 2018
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