How correctly to call a function from another file?

[juliano.gomes]

Here is the solution:

DialogForm::DialogForm(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::DialogForm)
{
    ui->setupUi(this);
    connect(ui->pbClearLineEdit, &QPushButton::clicked, static_cast<MainWindow*>(parent), &MainWindow::clear);
}

DialogForm::DialogForm(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::DialogForm)
{
    ui->setupUi(this);
    connect(ui->pbClearLineEdit, &QPushButton::clicked, static_cast<MainWindow*>(parent), &MainWindow::clear);
}

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