boost::log::range_manipulator<RangeT, void>
// In header: <boost/log/utility/manipulators/range.hpp> template<typename RangeT> class range_manipulator<RangeT, void> { public: // construct/copy/destruct explicit range_manipulator(RangeT const &) noexcept; // public member functions template<typename StreamT> void output(StreamT &) const; };