...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::log::sinks::combine_requirements
// In header: <boost/log/sinks/frontend_requirements.hpp> template<typename... RequirementsT> struct combine_requirements { };
The metafunction combines multiple requirement tags into one type. The resulting type will satisfy all specified requirements (i.e. has_requirement
metafunction will return positive result).