...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::stl_interfaces::v1::v1_dtl::decrementable_sentinel
// In header: <boost/stl_interfaces/fwd.hpp> template<typename Range, typename = void> struct decrementable_sentinel : public false_type { };