buttons and signal_clicked with sigc::mem_fun and pointers

[Luca Guglielmetti <luca_guglielmetti ticino edu>]

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Hi I'm new to this mailing-list  ;)
I have a little problem using pointers and buttons:
I put some check buttons in a VBox with a for loop. All the code is ok,
because when I leave the following line the program works fine.

a_CheckButtons[i-1]->signal_clicked().connect
(
	sigc::mem_fun(*this, &Preferences::on_checkbutton_clicked)(&i,1)
);

The problem will also be in the line, but I think I've not understood
well in wich way sigc::mem_func() does work

this is my code:

Preferences::Preferences()
:
m_Frame("Preferences")
{
	set_border_width(10);
	set_size_request(150, 260);
	set_title("Multiplication");

	add(m_VBox);

	m_Frame.add(m_HBox);

	for(int i=1; i<=10; i+=2)
	{
		a_CheckButtons[i-1] = new Gtk::CheckButton();
		a_CheckButtons[i-1]->set_label(to_string(i));
		a_CheckButtons[i-1]->signal_clicked().connect
		(
		sigc::mem_fun(*this, &Preferences::on_checkbutton_clicked)(&i, 1)
		);
		m_VBox_1.pack_start(*a_CheckButtons[i-1]);
	}
}

void Preferences::on_checkbutton_clicked(int &numero)
{
	cout << "checked" << numero << endl;
}

thanks
Guglie
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