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Function template operator<<

boost::log::operator<<

Synopsis

// In header: <boost/log/utility/manipulators/optional.hpp>


template<typename StreamT, typename OptionalT, typename NoneT> 
  unspecified operator<<(StreamT & strm, 
                         optional_manipulator< OptionalT, NoneT > const & manip);

Description

Stream output operator for optional_manipulator. Outputs the optional value or the "none" marker, if one was specified on manipulator construction.


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