Re: Emitting and/or Catching a signal

[michi7x7 <mailing-lists michi7x7 de>]

Am 29.04.2010 22:52, schrieb Armin Burgmeier:
> On Sat, 2010-03-27 at 21:43 -0400, ArbolOne wrote:
>    
> > OS WinXP SP3
> > MinGW and MSYS= latest!
> > GCC
> > ~~~~
> > Reading specs from D:/XWin/mingw/bin/../lib/gcc/mingw32/3.4.5/specs
> > Configured with: ../gcc-3.4.5/configure --with-gcc --with-gnu-ld
> > --with-gnu-as --host=mingw32 --target=mingw32 --prefix=/mingw
> > --enable-threads --disable-nls --enable-languages=c,c
> > ++,f77,ada,objc,java --disable-win32-registry --disable-shared
> > --enable-sjlj-exceptions --enable-libgcj --disable-java-awt
> > --without-x --enable-java-gc=boehm --disable-libgcj-debug
> > --enable-interpreter --enable-hash-synchronization
> > --enable-libstdcxx-debug
> > Thread model: win32
> > gcc version 3.4.5 (mingw-vista special)
> > ====================================================
> >
> > OK, I give up!
> > I have been trying to emit a signal from one of my classes to another,
> > but it has proven to be beyond me. I am not an expert C++ programmer
> > let alone a GUI programmer, so bare with me please. Below is a snip of
> > the source code; since the class is so specific and at a such early
> > stage there aren't that many lines of code, nevertheless, my apology
> > for the use of the band-width; in the future I will try to post the
> > code on a URL site.
> > I would like to emphasize that any help and or observations are most
> > welcome as well as an observation
> >
> > Now, the problem with my program is that when I tried to compile it it
> > tells me that there is an error in "...\include\sigc++-2.0\sigc
> > ++\functor\stot.h in line 103
> >      
> This is not very specific. Please always show the exact compiler error
> message you get.
>
>    
> > //// -- file.cpp SNIP ******
> > Menu::Menu() {
> >      ..........
> >      //Command bar
> >      RefActionGroup->add( Gtk::Action::create("MenuFile", "_File") );
> >      RefActionGroup->add( Gtk::Action::create("New", Gtk::Stock::NEW,
> > "_New",        "Create a new fle"), sigc::mem_fun(*this,&
> > Menu::onActionActivated));
> >         ..........
> > /******* THIS IS THE CODE CAUSING THE PROBLEM **************/
> >      RefActionGroup->add( Gtk::Action::create("Quit",
> > Gtk::Stock::QUIT,"Quit", "Exit application"),  sigc::mem_fun(*this,&
> > Menu::signal_quit));
> >        .........
> > }
> >      
> The function you provide here as a callback (Menu::signal_quit) needs to
> match what RefActionGroup->add expects. According to the documentation
> it needs to be a function returning void and taking no arguments. The
> function you pass, Menu::signal_quit, does not return void though
> (according to your code below).
>
> I am not sure what this code is supposed to do. If you want to emit your
> quit signal when the action is activated, then supply a custom function
> as you do for your other action, and emit the signal in that function.
>
>    
> > //// -- file.hpp SNIP ******
> > class Menu : virtual public Gtk::VBox {
> > public:
> >          //signal accessor
> >          typedef sigc::signal<  my_enum::error_t>  type_signal_end;
> >          type_signal_end signal_quit();
> >
> > protected:
> >          type_signal_end m_signal_end1;
> >         .........
> > private:
> >          .........
> >      }; //class
> > ========================
> > // tester.hpp
> > class Tester : virtual public Gtk::Window {
> >          public:
> >                    ....
> >          private:
> >          Menu menu;
> >          void quit(){this->hide();}
> > };
> > // tester.cpp
> > Tester::Tester(){
> >               ..............
> >              ///////////
> >              menu.signal_quit().connect( sigc::mem_fun(*this,
> > &Tester::quit) );
> >             ///////////
> >             ................
> > }
> >
> > Can any body help?
> >      
> Armin
>
>
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>    
I finally reproduced my path through the sigc++-files. The proplem is 
located here i think (or better there was my problem located):

#ifdef SIGC_GCC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
  #define SIGC_WORKAROUND_OPERATOR_PARENTHESES template operator()
  #define SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
#else
  #ifdef SIGC_MSVC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
    #define SIGC_WORKAROUND_OPERATOR_PARENTHESES operator()
    #define SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
  #else
    #define SIGC_WORKAROUND_OPERATOR_PARENTHESES sun_forte_workaround
  #endif
#endif

for some reason one of this defines was set wrong in sigc++config.h