...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::math::fpc::percent_tolerance_t
// In header: <boost/test/tools/floating_point_comparison.hpp> template<typename FPT> struct percent_tolerance_t { // public member functions explicit percent_tolerance_t(FPT); // public data members FPT m_value; };