...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_delegate<T, true>
// In header: <boost/test/tools/floating_point_comparison.hpp> template<typename T> struct tolerance_based_delegate<T, true> : public mpl::bool_< is_floating_point< T >::value||(!std::numeric_limits< T >::is_integer &&std::numeric_limits< T >::is_specialized &&!std::numeric_limits< T >::is_exact)> { };