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boost::log::extract
// In header: <boost/log/attributes/value_extraction.hpp> template<typename DescriptorT, template< typename > class ActorT> result_of::extract< typename DescriptorT::value_type, DescriptorT >::type extract(expressions::attribute_keyword< DescriptorT, ActorT > const & keyword, attribute_value_set const & attrs);
The function extracts an attribute value from the view. The user has to explicitly specify the type or set of possible types of the attribute value to be extracted.
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