namespace {

void test() { std::cerr << "DOUBLE CLICK!\n"; }

}

// Compiles (bind obj takes no arguments)
connect_signal_mouse_left_click(
	find_widget<tbutton>(&window, "new_dir", false),
	boost::bind(&tfile_dialog::on_dir_create_cmd, this, boost::ref(window)));

// Does not compile (func takes no arguments)
filelist.connect_signal<event::LEFT_BUTTON_DOUBLE_CLICK>(test);