Why can't i call remove() on Gtk::EventBox?

Question

For some reason that is beyond me this doesn't work:

Gtk::EventBox *eb;
// ...
eb->foreach([eb](Gtk::Widget& w){ eb->remove(w); });

The error that i am getting is:

ImageClick.cpp: In lambda function:
ImageClick.cpp:20:50: error: no matching function for call to ‘Gtk::EventBox::remove(Gtk::Widget&)’
    eb->foreach([eb](Gtk::Widget& w){ eb->remove(w); });
                                                  ^
ImageClick.cpp:20:50: note: candidate is:
In file included from /usr/include/gtkmm-3.0/gtkmm/window.h:31:0,
                 from /usr/include/gtkmm-3.0/gtkmm/dialog.h:30,
                 from /usr/include/gtkmm-3.0/gtkmm/aboutdialog.h:33,
                 from /usr/include/gtkmm-3.0/gtkmm.h:99,
                 from ImageClick.cpp:1:
/usr/include/gtkmm-3.0/gtkmm/bin.h:141:8: note: void Gtk::Bin::remove()
   void remove();
        ^
/usr/include/gtkmm-3.0/gtkmm/bin.h:141:8: note:   candidate expects 0 arguments, 1 provided

But if i change it to eb->Gtk::Container::remove(w); it works as expected. Documentation shows that Gtk::EventBox is a subclass of Gtk::Container, and it is not a virtual function, nor is it overwritten anywhere. So what is the reason for such a behaviour?

Answer 1

It appears that it is a normal operation of C++

container.h

virtual void on_remove(Widget* widget);

bin.h

void remove();

and eventbox.h doesn't have this function defined.

Trying to recreate this scenario:

#include <iostream>

class A
{
public:
    void foo(int) { std::cout << 'A' << std::endl; }
};

class B : public A
{
public:
    void foo() { std::cout << 'B' << std::endl; }
};

class C : public B
{
};

int main()
{
    C c;
    c.foo(5);
}

The code above generates the exact same error. It appears that the name stops any further lookup. I was aware of shadowning, but didn't know this has happened when the shadowing function actually doesn't fit even with all the thunks in the world.