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This is an older version of Boost and was released in 2019. The current version is 1.90.0.
boost::histogram::algorithm::shrink_and_rebin — Shrink and rebin option to be used in reduce() (convenience overload for single axis).
// In header: <boost/histogram/algorithm/reduce.hpp> reduce_option shrink_and_rebin(double lower, double upper, unsigned merge);