如何从 Gtk::窗口调用派生对象的析构函数

我想从Gtk::Window派生，并希望从该对象创建一个独立的窗口。如果用户关闭该窗口，我如何才能调用派生对象的析构函数。

我想在窗口被用户破坏的那一刻关闭它。我尝试在"on_signal_delete"处理程序中执行此操作，但这会导致段错误。

目前我的代码从未调用独立窗口的析构函数！

#include <iostream>
#include <string>
#include <gtkmm.h>

class ExampleWindow : public Gtk::Window
{
protected:
//Child widgets:
Gtk::Box m_VBox; 
Gtk::Label m_Label1;
std::string mytext;
public:
ExampleWindow(const std::string& text_):
m_VBox{ Gtk::ORIENTATION_VERTICAL }
,m_Label1{ text_ }
,mytext{ text_ }
{
set_title("Example");
set_border_width(10);
set_default_size(400, 200);
add(m_VBox);
m_VBox.pack_start( m_Label1 );
show_all_children();
}
virtual ~ExampleWindow()
{
// Not called for the stand alone win while closing it. How to achieve that?
std::cout << "Destructor called for " << mytext << std::endl;
}
bool on_delete_event( GdkEventAny* ) override
{
std::cout << "sig on delete called"  << mytext << std::endl;
// free( this ); // that results in segfault
return true;
}

};  

int main(int argc, char *argv[])
{
auto app = Gtk::Application::create(argc, argv, "some.base");
ExampleWindow window{ "First Window" };
// Create the same window as free window ( toplevel )
ExampleWindow* win2 = new ExampleWindow("Stand Alone Win");
win2->show();   // How can I desruct this window, if a user closes it?
//Shows the window and returns when it is closed.
return app->run(window);
}

编辑：正如评论中讨论为什么不可能不使用new我提供了这个更复杂的示例来表明我的真实世界应用程序必须从 gtk 中的信号处理程序创建新窗口。因此，需要按需创建对象。

可以按需创建新窗口的完整示例：

#include <iostream>
#include <string>
#include <gtkmm.h>

class ExampleWindow : public Gtk::Window
{
protected:
//Child widgets:
Gtk::Box m_VBox;
Gtk::Button m_button;
std::string mytext;
public:
ExampleWindow(const std::string& text_):
m_VBox{ Gtk::ORIENTATION_VERTICAL }
,m_button{ text_ }
,mytext{ text_ }
{
set_title("Example");
set_border_width(10);
set_default_size(400, 200);
add(m_VBox);
m_VBox.pack_start( m_button );
m_button.signal_clicked().connect(sigc::mem_fun(this,&ExampleWindow::on_clicked));
show_all_children();
}   
void on_clicked()
{   
ExampleWindow* win2 = new ExampleWindow("Stand Alone Win");
win2->show();   // How can I desruct this window, if a user closes it?
}

virtual ~ExampleWindow()
{
// Not called for the stand alone win while closing it. How to achieve that?
std::cout << "Destructor called for " << mytext << std::endl;
}
bool on_delete_event( GdkEventAny* ) override
{
std::cout << "sighandler on_delete called"  << mytext << std::endl;
//delete this; // results in segfault
return false;
}
};

int main(int argc, char *argv[])
{
auto app = Gtk::Application::create(argc, argv, "some.base");
ExampleWindow window{ "Press to create new win" };
//Shows the window and returns when it is closed.
return app->run(window);
}

问题仍然是：我可以在哪里挂接到信号处理程序以free动态创建的顶级窗口。