...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::expressions::keyword_descriptor
// In header: <boost/log/expressions/is_keyword_descriptor.hpp> struct keyword_descriptor { };
Base class for keyword descriptors. All keyword descriptors must derive from this class to support the is_keyword_descriptor
trait.