...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::icl::is_negative
// In header: <boost/icl/functors.hpp> template<typename Functor> struct is_negative { // types typedef is_negative< Functor > type; // public member functions BOOST_STATIC_CONSTANT(bool, value = false); };