...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::tolerance_based — Indicates if a type can be compared using a tolerance scheme.
// In header: <boost/test/tools/floating_point_comparison.hpp> template<typename T> struct tolerance_based : public tolerance_based_delegate::type { };