boost::accumulator: which operators for sample_type?

Question

I want to use a boost::accumulator for defining a moving average of my custom class:

boost::accumulators::accumulator_set<MySample, boost::accumulators::stats<boost::accumulators::tag::rolling_mean> >

My problem is that my sample is a user defined class (vector implementation of another library).

I've seen in this post that's possible to define accumulators for std::vectors, but it does not specify which operator must be overloaded because it overloads them with boost/accumulators/numeric/functional/vector.hpp.

If I want to use accumulator with an user-defined sample class, which operator I must overload and how?

Answer 1

The answer is going to differ depending on the stats you use, and sadly none of this is well documented. The best answer I can give is to try to compile it, look at the error message, add the needed operator, rinse, repeat until things work. :-/