...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::operator<<
// In header: <boost/log/utility/manipulators/invoke.hpp> template<typename StreamT, typename FunctionT> unspecified operator<<(StreamT & stream, invoke_manipulator< FunctionT > const & manip);
Stream output operator for
. Invokes the function saved in the manipulator. invoke_manipulator