Migrating from C to C++

So I am now migrating from C to C++, but this only goes very slowly.

This is a simple test to check if my rig control part of the program still works with C++ environment.

void myfunc( void ); 

Buttons::Buttons()
{
  m_button.add_pixlabel("blueracer2.png", "CW");
  set_title("Spinor Lab");
  set_border_width(10);
  m_button.signal_clicked().connect( sigc::mem_fun(*this, &Buttons::on_button_clicked) );
  add(m_button);
  show_all_children();
}

Buttons::~Buttons()
{
}

void Buttons::on_button_clicked()
{
  std::cout << "The Button was clicked." << std::endl;
  myfunc();
}