AMDG "John Maddock" wrote:

Right: and for some accumulators the addition of two accumulators may not be possible at all. But can't we make this a conceptual requirement that if you try and combine two accumulator sets, then each accumulator must have a "combine" method (otherwise you get a compile time error). The "combine" methods for min/max/sum/count etc are all trivial aren't they - and could be added fairly easily ? But Eric would know the details :-)

John. Why not let accumulator_set support a fusion sequence interface? Then combine/reset could be implemented using fusion::for_each, right?

In Christ, Steven Watanabe