Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2019. The current version is 1.89.0.
boost::accumulators::tag::error_of
// In header: <boost/accumulators/statistics_fwd.hpp> template<typename Feature> struct error_of : public boost::accumulators::depends_on< Feature > { };