c++ - Don't understand why I can't call setCentralWidget in QMainWindow subclass -

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 //clposter.h class clposter : public qmainwindow {     q_object
  
public:     clposter();
  
private slots:     qwidget createcentralwidget();     void createactions();     void createmenu();     void createstatusbar();     void loadsavedposts(); }; 

 //clposter.cpp clposter::clposter() {     setwindowtitle("craigslist poster");
  
qwidget mainwidget = createcentralwidget(); setcentralwidget(mainwidget); 
  
//    createactions(); //    createmenu(); //    createstatusbar();
  
//    loadsavedposts(); //    checkforactionsneeded();    //may want break more functions }

the error i'm getting this:

/usr/include/qt4/qtgui/qwidget.h:: in constructor ‘clposter::clposter()’: /usr/include/qt4/qtgui/qwidget.h:787: error: ‘qwidget::qwidget(const qwidget&)’ private /home/brett/projects/clposter/clposter-build-desktop/../clposter/clposter.cpp:9: error: within context /home/brett/projects/clposter/clposter-build-desktop/../clposter/clposter.cpp:10: error: no matching function call ‘clposter::setcentralwidget(qwidget&)’ /usr/include/qt4/qtgui/qmainwindow.h:141: candidates are: void qmainwindow::setcentralwidget(qwidget*)

i'm having trouble interpreting error message. says there no matching function call, should inheriting qmainwindow. lack of understanding c++ more qt, first time i've used it, dunno. help.

all qwidget items must allocated in free-store (new) since have have "parents". in qt parent delete children (with delete). why function returning, accepting, whatever widget going on pointer widget, not widget itself; need same.


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