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This is an older version of Boost and was released in 2024. The current version is 1.90.0.
boost::log::expressions::channel_severity_filter
// In header: <boost/log/expressions/predicates/channel_severity_filter.hpp> template<typename ChannelT, typename SeverityT> channel_severity_filter_actor< ChannelT, SeverityT > channel_severity_filter(attribute_name const & channel_name, attribute_name const & severity_name);