error: request for member 'show' is ambiguous w.show()

[rahulvishwakarma]

hi to all, i've Qt 5.7 in Centos 7 in VM, i am trying to build small program.
i've Qt 5.7 in Centos 7 in VM, i am trying to build small program spreadsheet reader.

#include "mymainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MyMainWindow w;
    w.show(); // <-- ambiguity

    return a.exec();
}

mine mymainwindow.h is :
update 1:-
i tried virtual inheritance because two headers are using same class
class maninwindow is :-

#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H
#include <QMainWindow>
#include <QFile>
#include <QLabel>
#include <QStringList>
#include <QString>
#include <QTableWidget>

#include "cell.h"
#include "spsheetdialog.h"
#include "gotocelldialog.h"
#include "sortdialog.h"

class GoToCellDialog;
class FindDialog;
class SPsheetDialog;
class Cell;
class SortDialog;

namespace Ui {
class MyMainWindow;
}

class MyMainWindow : public QMainWindow, public virtual QTableWidget
{
    Q_OBJECT

public:
    explicit MyMainWindow(QWidget *parent = 0);
    virtual ~MyMainWindow();

private slots:
    void on_actionNew_triggered();
    void on_actionOpen_triggered();
    void on_actionSave_As_triggered();
    void on_actionGoTo_cell_triggered();
    void on_actionSort_triggered();
    void on_actionAbout_triggered();
    void openRecentFile();
    void updateStatusBar();
    void spreadsheetModified();
    bool saveAs();
    bool save();

private:
    Ui::MyMainWindow *ui;

    enum { MaxRecentFiles = 5 };

    QAction *recentFileActions[MaxRecentFiles];

    QStringList recentFiles;
    SPsheetDialog *spsheet;
    Cell *cell;

    void readSettings();
    void writeSettings();
    bool okToContinue();
    void connectActions();
    void configureStatusBar();

    void setCurrentFile(const QString &fileName);
    void updateRecentFileActions();
    bool loadFile(const QString &fileName);
    bool saveFile(const QString &fileName);
    QString strippedName(const QString &fullFileName);

    QLabel *labelLocation;
    QLabel *labelFormula;

    QString curFile;
};

#endif // MYMAINWINDOW_H

and other spreadsheet.h

#ifndef SPSHEETDIALOG_H
#define SPSHEETDIALOG_H

#include <QDialog>
#include <cell.h>
#include <spsheetdialog.h>

class Cell;
class SpreadsheetCompare;

namespace Ui {
class SPsheetDialog;
}

class SPsheetDialog : public QDialog, public virtual QTabWidget
{
    Q_OBJECT

public:
    explicit SPsheetDialog(QWidget *parent = 0);
    ~SPsheetDialog();

    bool autoRecalculate() const { return autoRecalc; }
    void clear();
    bool readFile(const QString &fileName);
    QString currentLocation() const;
    QString currentFormula() const;
    QTableWidgetSelectionRange selectedRange() const;
    bool writeFile(const QString &fileName);
    void sort(const SpreadsheetCompare &compare);
signals:
    void modified();
private:
    Ui::SPsheetDialog *ui;
public slots:
    void cut();
    void copy();
    void del();
    void paste();
    void selectCurrentRow();
    void recalculate();
    void setAutoRecalcuate();
    void findNext(const QString &str, Qt::CaseSensitivity cs);
    void findPrevious(const QString &str, Qt::CaseSensitivity cs);
private slots:
    void somethingChanged();
private:
    enum { MagicNumber = 0x7F51C883, RowCount = 999, ColumnCount = 26 };

    Cell *cell(int row, int column) const;
    QString text(int row, int column) const;
    QString formula(int row, int column) const;

    void setFormula(int row, int column, const QString &formula);
    bool autoRecalc;


};

class SpreadsheetCompare
{
public:
    bool operator()(const QStringList &row1,
                    const QStringList &row2) const;

    enum { KeyCount = 3 };
    int keys[KeyCount];
    bool ascending[KeyCount];
};
#endif // SPSHEETDIALOG_H
i have a problem of ambiguity in show function. but i am not getting where do these  two same code ( show ) are included. Which header should i include

[mrjj]

Hi
You have some very odd inheritance

class MyMainWindow : public QMainWindow, public virtual QTableWidget

Both are Widgets so there will be 2 shows etc.

Also, why inherited BOTH a MainWindow and a QTableWidget ?

Normally you just put the QTableWidget in the Mainwindow.
(and it would be ui->tablewidget to talk to it)

Having a window that is both a window and a TableWidget blows my brain :)

[rahulvishwakarma]

i want to connect spreadsheet reader signal "currentCellChanged" which is signal of QTableWidget as here

connect(spsheet, SIGNAL(currentCellChanged(int,int,int,int)), this, SLOT(updateStatusBar()) );

[JonB]

@rahulvishwakarma
You really need to heed what @mrjj is saying, and start by rewriting/redesigning:

Also, why inherited BOTH a MainWindow and a QTableWidget ?

Normally you just put the QTableWidget in the Mainwindow.

(and it would be ui->tablewidget to talk to it)

First do that, then sort out the signals/slots, when your code will work.

[mrjj]

Hi
Ok normally that would be having just MainWindow derived ONLY from QMainwindow
and then place the QTableWidget on the UI form.

and then in MainWindow.h define a matching slot

class MainWindow : public QMainWindow
{
Q_OBJECT
public slots:
void currentCellChanged(int currentRow, int currentColumn, int previousRow, int previousColumn);
...

and the body in mainwindow.cpp

void MainWindow::currentCellChanged(int currentRow, int currentColumn, int previousRow, int previousColumn)
{
 // call here update statubar etc
}

and then in the MainWindow constructor

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    connect(ui->tableWidget, &QTableWidget::currentCellChanged, this, &MainWindow::currentCellChanged );

}