关于QT Designer生成的ui文件，make 时候总提示"undefined reference to `vtable for"解决方法

#ifndef GOCELL_H
#define GOCELL_H

#include <QDialog>
#include "ui_gocell.h"

class GoCell : public QDialog, public Ui::ToCellDialog
{
   Q_OBJECT

    public:
        GoCell(QWidget *parent = 0);

  private slots:
        void on_lineEdit_textChanged();
};
#endif

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

GoCell :: GoCell(QWidget *parent) : QDialog(parent)
{
    setupUi(this);

    QRegExp regExp("[A-Za-z][0-9]{0, 2}");
    lineEdit->setValidator(new QRegExpValidator(regExp, this));

    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));
}

void GoCell::on_lineEdit_textChanged()
{
    okButton->setEnabled(lineEdit->hasAcceptableInput());
}

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

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    GoCell *dialog = new GoCell;
    dialog->show();
    return app.exec();
}