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boost::histogram::axis::traits::is_reducible — Meta-function to detect whether an axis is reducible.
// In header: <boost/histogram/axis/traits.hpp> template<typename Axis> struct is_reducible { };
Doxygen does not render this well. This is a meta-function (template alias), it accepts an axis type and represents compile-time boolean which is true or false, depending on whether the axis can be reduced with boost::histogram::algorithm::reduce().
An axis can be made reducible by adding a special constructor, see Axis concept for details.