Having this code is possible to emit the progressTextChanged(QString) signal? i have tried but i when trying to access the signal the compiler says it is protected.

Qt Code: 
  1. //...
  2. //...
  3. QFuture<bool> future = QtConcurrent::run( 
  4.         this, 
  5.         &MyClass::runTheTask );
  6.  
  7.     QFutureWatcher<bool> watcher;
  8.     connect( &watcher, SIGNAL( progressTextChanged( const QString ) ), 
  9.              this, SLOT( appendMessageToStatusLineEdit( const QString ) ) );
  10.     watcher.setFuture( future );
  11.     future.waitForFinished();
  12.  
  13. // ...
  14. // ...
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Qt Code: 
  1. bool MyClass::runTheTask()
  2. {
  3. // do the task
  4.  
  5.  
  6.  
  7. // how to emit progress text signal???
  8. }
  9.  
  10. void MyClass::appendMessageToStatusLineEdit( const QString msg )
  11. {
  12.     QMetaObject::invokeMethod( this, 
  13.                                "doAppendMessageToStatusLineEdit", 
  14.                                Qt::QueuedConnection,
  15.                                Q_ARG( QString, msg ) );
  16. }
  17.  
  18. void MyClass::doAppendMessageToStatusLineEdit( const QString msg )
  19. {
  20.     _ui->statusTextEdit->append( msg );
  21. }
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