title: search QStringView in QHash<QString, DataType> without memory allocation?
body: <p>After parsing of text data I got <code>QStringView</code>.
  And I need to search if it exists in variable of type <code>QHash&lt;QString, DataType&gt;</code>.
  Is it possible without conversation of <code>QStringView</code> to <code>QString</code>,
  in other words is it possible without allocation?</p>
  <p>May I can use some other <code>Qt</code> type for this with similar to <code>QHash</code> functionality?</p>