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Function template has_attr



// In header: <boost/log/expressions/predicates/has_attr.hpp>

template<typename DescriptorT, template< typename > class ActorT> 
  unspecified has_attr(attribute_keyword< DescriptorT, ActorT > const &);


The function generates a terminal node in a template expression. The node will check for the attribute value presence in a log record. The node will also check that the attribute value has the specified type, if present.