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boost::log::operator<<
// In header: <boost/log/utility/manipulators/tuple.hpp> template<typename StreamT, typename TupleT, typename DelimiterT> unspecified operator<<(StreamT & strm, tuple_manipulator< TupleT, DelimiterT > const & manip);
Stream output operator for tuple_manipulator
. Outputs every element of the sequence, separated with a delimiter, if one was specified on manipulator construction.