title: Qwt for Qt: How to connect to signal with new signal/slot flavour?
body: <p>I want to to connect to legend-label SIGNAL checked. With Qts old Signal/Slot-Syntax all is perfect, but i want to use the new connection to enable compile-time check? Any idea on how to connect it via new Signal/Slot-Syntax?</p>
  
  <p>This is my code:</p>
  
  <pre><code>connect( m_plotLegend, SIGNAL( checked( const QVariant &amp;, bool, int ) ), SLOT(legendChecked( const QVariant &amp;, bool ) ) );
  //connect(m_plotLegend, &amp;QwtLegend::checked, this, &amp;MeasurePlot::legendChecked);
  </code></pre>
  
  <p>With oldy syntax all is fine, with the new syntax the slot is never reached. Any ideas? Thank you very much!</p>