title: Get severity of boost.log logger..?
body: <p>Suppose I have a simple boost.log <code>severity_logger</code> logger set up like this:</p>
  
  <pre><code>   logging::core::get()-&gt;set_filter(logging::trivial::severity &gt;= logging::trivial::debug);
     logging::add_common_attributes();
     src::severity_logger&lt; logging::trivial::severity_level &gt; logger;
  </code></pre>
  
  <p>How would I check the severity programmatically?<br>
  I.e. somethinig like <code>logger.getSeverity()</code>..?</p>
  
  <p>I've sifted through the docs and other questions here on StackOverflow but just couldn't find what should be a straightforward API call..?</p>