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boost::log::tuple_manipulator::output_visitor
// In header: <boost/log/utility/manipulators/tuple.hpp> template<typename StreamT> struct output_visitor { // types typedef boost::true_type result_type; // public member functions output_visitor(StreamT &, stored_delimiter_type) noexcept; template<typename T> result_type operator()(boost::true_type, T const &) const; template<typename T> result_type operator()(boost::false_type, T const &) const; };