...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::histogram::accumulators::is_thread_safe<thread_safe< T >>
// In header: <boost/histogram/accumulators/thread_safe.hpp> template<typename T> struct is_thread_safe<thread_safe< T >> : public true_type { };