Hi,
I am new to gtk/gtkmm. I have some basic questions about
memory management which I was not able to look up from
the list / manual.
If I am trying to keep the widgets that I do not need
to access after having specified the layout, I end up
putting them on the heap.
FindDlg::FindDlg()
{
Gtk::VBox* vbox(Gtk::manage(new Gtk::VBox));
// ...
// ...
add(*vbox);
}
Fine, just that no function between new and add must throw,
or I am getting leaks.
Next attempt:
class FindDlg : public Gtk::Window
{
public:
FindDlg();
virtual ~FindDlg();
protected:
// the next both widgets need to be
// accessed during lifetime of FindDlg
Gtk::ComboBoxEntryText m_find;
Gtk::FileChooserButton m_file;
};
FindDlg::FindDlg()
{
set_default_size(500,500);
// create local widgets, and put them into auto_ptr
// and mark them as managed
std::auto_ptr<Gtk::VBox> vbox(Gtk::manage(new Gtk::VBox));
std::auto_ptr<Gtk::HBox> query(Gtk::manage(new Gtk::HBox));
std::auto_ptr<Gtk::Label> findpat(Gtk::manage(new Gtk::Label));
std::auto_ptr<Gtk::Label> results(Gtk::manage(new Gtk::Label));
// adjust the widgets and set data
findpat->set_label("File find pattern:");
findpat->set_alignment(Gtk::ALIGN_LEFT);
results->set_label("Search results:");
results->set_alignment(Gtk::ALIGN_LEFT);
vbox->set_border_width(10);
// hand off the widgets to their containers
// take care, not to access a widget after release
vbox->pack_start(*findpat.release(), Gtk::PACK_SHRINK);
query->pack_start(m_find,Gtk::PACK_EXPAND_WIDGET);
query->pack_end(m_file,Gtk::PACK_SHRINK);
vbox->pack_start(*query.release(),Gtk::PACK_SHRINK);
vbox->pack_start(*results.release(), Gtk::PACK_SHRINK);
add(*vbox.release());
show_all_children();
}
FindDlg::~FindDlg()
{
}
This code looks very "noisy" and fragile to me. Are there any
recommendations to do better? In particular I am interested
in comments about better style of memory management.
Thank you,
speedsnail
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