On 06/10/2010 02:19 PM, Dirk Griffioen wrote:

Hi,

I am trying to use 2 loggers - 1 severity logger - 1 'normal' logger

However, when I add

sink->set_filter(flt::attr< severity_level >("Severity") >= level);

to the severity logger sink and try to use the second logger I get:

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::log_mt_posix::missing_value>

...

' what(): Requested attribute value not found

The second logger has no formatter:

backend->set_formatter(fmt::stream << fmt::message());

Nor has it any attribute.

I tried different solutions, but nothing works - what am I missing?

If you emit log records from the basic logger (not the one with severity level), the record doesn't contain the severity level attached. The filter throws because it doesn't find it in the record. You can change the filter in two ways to avoid the exception: 1. flt::attr< severity_level >("Severity", std::nothrow) >= level That way the filter will silently drop all records without the level attached. 2. !flt::has_attr< severity_level >("Severity") || flt::attr< severity_level >("Severity") >= level That way it will pass all records without the level.