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sigc::mem_fun / GTKmm question (pointers and classes)

VilleA (8)
Hi,

And thanks in advance if somebody is able to help me.

I am using Ubuntu and wanted to do GUI, so I went for GTKmm. My whole project is now about 6 different header files, from file
operations to drawing in Cairo. I am getting into situations where I have to put information both ways from classes to others.
Biggest problem (where I am stuck now) is the signals from buttons to do something in another class:

m_buttonrefresh.signal_clicked().connect( sigc::mem_fun(*this, &Window::on_clicked) );

If Window is not the class in who's constructor this is in, it does not work. For better idea what I am talking about,
I made this example:

apu.h

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#ifndef INDEKSI

#define INDEKSI

#include <gtkmm.h>

class Indeksi

{

public:

  Indeksi();

  virtual ~Indeksi();

	void on_button_clicked();
};

#endif //INDEKSI


apu.cc
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#include "apu.h"
#include <iostream>

Indeksi::Indeksi()

{
}

Indeksi::~Indeksi()
{
}

void Indeksi::on_button_clicked()
{
 std::cout << "teksti";
}


helloworld.h
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#ifndef GTKMM_EXAMPLE_HELLOWORLD_H
#define GTKMM_EXAMPLE_HELLOWORLD_H
#include "apu.h"
#include <gtkmm/button.h>
#include <gtkmm/window.h>

class HelloWorld : public Gtk::Window
{
public:
  HelloWorld();
  virtual ~HelloWorld();

protected: 
  void on_button_clicked(); 
  Gtk::Button m_button;
};

#endif // GTKMM_EXAMPLE_HELLOWORLD_H


helloworld.cc
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#include "helloworld.h"
#include <iostream>

HelloWorld::HelloWorld()
: m_button("Hello World")   
{

  set_border_width(10);
  m_button.signal_clicked().connect(sigc::mem_fun(*this, &Indeksi::on_button_clicked));           
  add(m_button);	
  m_button.show();   
}

HelloWorld::~HelloWorld()
{
}

void HelloWorld::on_button_clicked()
{
  std::cout << "Hello World" << std::endl;
}


main.cc
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#include "helloworld.h"
#include <gtkmm/main.h>

int main (int argc, char *argv[])
{
  Gtk::Main kit(argc, argv);
  HelloWorld helloworld;
  Gtk::Main::run(helloworld); 
  return 0;
}




Output:
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In file included from /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:9:0,

                 from /usr/include/sigc++-2.0/sigc++/functors/slot.h:7,
                 from /usr/include/sigc++-2.0/sigc++/signal_base.h:31,
                 from /usr/include/sigc++-2.0/sigc++/signal.h:8,
                 from /usr/include/sigc++-2.0/sigc++/sigc++.h:23,
                 from /usr/include/glibmm-2.4/glibmm/signalproxy.h:13,
                 from /usr/include/glibmm-2.4/glibmm/objectbase.h:23,
                 from /usr/include/glibmm-2.4/glibmm/wrap.h:26,
                 from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:25,
                 from /usr/include/glibmm-2.4/glibmm/arrayhandle.h:23,
                 from /usr/include/glibmm-2.4/glibmm.h:83,
                 from /usr/include/gtkmm-2.4/gtkmm.h:87,
                 from apu.h:4,
                 from helloworld.h:3,
                 from helloworld.cc:2:

/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In function ‘sigc::bound_mem_functor0<T_return, T_obj> sigc::mem_fun(T_obj&, T_return (T_obj2::*)()) [with T_return = void, T_obj = HelloWorld, T_obj2 = Indeksi]’:

helloworld.cc:13:85:   instantiated from here

/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:5453:61: error: no matching function for call to ‘sigc::bound_mem_functor0<void, HelloWorld>::bound_mem_functor0(HelloWorld&, void (Indeksi::*&)())’

/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1778:3: note: candidates are: sigc::bound_mem_functor0<T_return, T_obj>::bound_mem_functor0(T_obj&, sigc::bound_mem_functor0<T_return, T_obj>::function_type) [with T_return = void, T_obj = HelloWorld, sigc::bound_mem_functor0<T_return, T_obj>::function_type = void (HelloWorld::*)()]

/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1769:3: note:                 sigc::bound_mem_functor0<T_return, T_obj>::bound_mem_functor0(T_obj*, sigc::bound_mem_functor0<T_return, T_obj>::function_type) [with T_return = void, T_obj = HelloWorld, sigc::bound_mem_functor0<T_return, T_obj>::function_type = void (HelloWorld::*)()]

/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1760:1: note:                 sigc::bound_mem_functor0<void, HelloWorld>::bound_mem_functor0(const sigc::bound_mem_functor0<void, HelloWorld>&)


If I replace &Indeksi::on_button_clicked with &HelloWorld::on_button_clicked, it works nicely.

I only know that this probably something to do with pointers and sigc::mem_fun, but have no clue how to fix it. Help is truly appreciated!
Last edited on
Denis (350)
try this

 
 
m_button.signal_clicked().connect(sigc::mem_fun(this, &Indeksi::on_button_clicked));
VilleA (8)
still getting the same error. 

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In file included from /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:9:0,
                 from /usr/include/sigc++-2.0/sigc++/functors/slot.h:7,
                 from /usr/include/sigc++-2.0/sigc++/signal_base.h:31,
                 from /usr/include/sigc++-2.0/sigc++/signal.h:8,
                 from /usr/include/sigc++-2.0/sigc++/sigc++.h:23,
                 from /usr/include/glibmm-2.4/glibmm/signalproxy.h:13,
                 from /usr/include/glibmm-2.4/glibmm/objectbase.h:23,
                 from /usr/include/glibmm-2.4/glibmm/wrap.h:26,
                 from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:25,
                 from /usr/include/glibmm-2.4/glibmm/arrayhandle.h:23,
                 from /usr/include/glibmm-2.4/glibmm.h:83,
                 from /usr/include/gtkmm-2.4/gtkmm.h:87,
                 from apu.h:4,
                 from helloworld.h:3,
                 from helloworld.cc:2:
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In function ‘sigc::bound_mem_functor0<T_return, T_obj> sigc::mem_fun(T_obj*, T_return (T_obj2::*)()) [with T_return = void, T_obj = HelloWorld, T_obj2 = Indeksi]’:
helloworld.cc:13:84:   instantiated from here
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:5441:61: error: no matching function for call to ‘sigc::bound_mem_functor0<void, HelloWorld>::bound_mem_functor0(HelloWorld*&, void (Indeksi::*&)())’
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1778:3: note: candidates are: sigc::bound_mem_functor0<T_return, T_obj>::bound_mem_functor0(T_obj&, sigc::bound_mem_functor0<T_return, T_obj>::function_type) [with T_return = void, T_obj = HelloWorld, sigc::bound_mem_functor0<T_return, T_obj>::function_type = void (HelloWorld::*)()]
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1769:3: note:                 sigc::bound_mem_functor0<T_return, T_obj>::bound_mem_functor0(T_obj*, sigc::bound_mem_functor0<T_return, T_obj>::function_type) [with T_return = void, T_obj = HelloWorld, sigc::bound_mem_functor0<T_return, T_obj>::function_type = void (HelloWorld::*)()]
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1760:1: note:                 sigc::bound_mem_functor0<void, HelloWorld>::bound_mem_functor0(const sigc::bound_mem_functor0<void, HelloWorld>&)


Denis (350)


m_button.signal_clicked().connect(sigc::mem_fun(this, &HelloWorld::on_button_clicked));
VilleA (8)
Yes, but I want to call Indeksi::on_button_clicked();
Denis (350)
In this case you need to pass pointer to Indeksi (not to HelloWorld as you are doing using this
VilleA (8)
Thanks a lot! It works.

I appreciate the help!
Last edited on
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