void operator()(std::ostream& strm, logging::record const& rec) const
{
// We need to acquire the attribute value from the log record
logging::visit< scope_stack >
(
name_,
rec.attribute_values(),
boost::bind(&scope_list_formatter::format, boost::ref(strm), _1)
);
}
//[ example_core_record_attr_value_lookup
// Prints severity level by searching the attribute values
void print_severity_lookup(logging::record const& rec)
{
logging::attribute_value_set const& values = rec.attribute_values();
logging::attribute_value_set::const_iterator it = values.find("Severity");
if (it != values.end())
{
logging::attribute_value const& value = it->second;
// A single attribute value can also be visited or extracted
std::cout << value.extract< severity_level >() << std::endl;
}
}
//[ example_tutorial_formatters_custom
void my_formatter(std::ostream& strm, logging::record const& rec)
{
// Get the LineID attribute value and put it into the stream
strm << logging::extract< unsigned int >("LineID", rec).get() << ": ";
// The same for the severity level
strm << "<"
<< logging::extract< logging::trivial::severity_level >("Severity", rec).get()
<< "> ";
// Finally, put the record message to the stream
strm << rec.message();
}