gistfile1.cpp

class Hoge
{ Q_OBJECT;
public:
  Hoge();

private slot:
  void OnButtonClicked(bool);

private:
  QPushButton *button_
};

Hoge::Hoge() : button_(new QPushButton("Push Me!"))
{
  connect(button_, SIGNAL(clicked(bool)), this, SLOT(OnButtonClicked()));

  button_->show();
}

void Hoge::OnButtonClicked()
{
  QMessageBox::information("Button Clicked!");
}