If you want to pass a widget to a signal handler, I suggest you pass a widget pointer. See e.g. https://gitlab.gnome.org/GNOME/gtkmm-documentation/blob/gtkmm-3-24/examples/book/buildapp/step5/exampleapplication.cc line 46.
In your case: menu_item.signal_activate().connect(sigc::bind<Gtk::Window*>(sigc::ptr_fun(&handler_fun), this)); Of course you must change handler_fun() accordingly. I also repeat Daniel's question: Which function does not exist? If it's one of the sigc:: functions, you probably have to add an #include. On 2019-02-18 14:39, Радомир Хаџић via gtkmm-list wrote:
I'm trying to call a function that accepts one parameter when user clicks a menu item. I tried this: menu_item.signal_activate().connect(sigc::bind<Gtk::Window>(sigc::ptr_fun(&handler_fun), *this)) The method I put this code into is of class that inherits from Gtk::Window. The handler_fun function does not belong to any class. I saw this in official tutorial (https://developer.gnome.org/gtkmm-tutorial/stable/sec-binding-extra-arguments.html.en) but it doesn't work for me (the code won't compile). The error I'm getting is that there is no such function.
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