QWT in QT: displaying qwt plot as widget on mainwindow

[zaidi1212]

Hello all,

I have developed a code for plotting sine wave in qwt.I have made a subclass of QWT with the name of plot. I want to show this plot as widget in mainwindow. I did following in Mainwindow.cpp:

dplot  = new plot(this );
    const int margin = 4;
    dplot->setContentsMargins( margin, margin, margin, margin );
 
    setCentralWidget( dplot );

dplot  = new plot(this );
    const int margin = 4;
    dplot->setContentsMargins( margin, margin, margin, margin );

    setCentralWidget( dplot );

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and in Mainwindow.h I have declared the class plot like this:

#include <QMainWindow>
 
class plot;
 
class MainWindow: public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
 
private Q_SLOTS:
 
 
private:
 
 
private:
plot *dplot;
 
};

#include <QMainWindow>

class plot;

class MainWindow: public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();

private Q_SLOTS:


private:


private:
plot *dplot;

};

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I am facing following error after compiling:

In constructor 'MainWindow::MainWindow()':
error: no matching function for call to 'plot:lot(MainWindow* const)'
candidates are: plot:lot()
plot:lot(const plot&)

Please help me.