Re: [sigc] example1

[Mauricio Henriquez <mhenriquezs terra cl>]

Hi:
Please help me with this, I also have problems to compile some simple 
examples that I find in a libsigc++ rpm paquage, I try to compile with 
this command:

g++ signals.cc -o signals `pkg-config --cflags --libs sigc++-2.0`

the simple "hello_world.cc" work fine, but I try to compile a second 
example (at bottom of this message) I can't asociate object method, only 
funtion pointers (I comment the stuff that don't work to try to compile 
the rest of the example):
// I don't know the correct libsigc++ include section, I use fedora 5 I 
try different combinations
#include <iostream>
#include <string>
// (1) Include the signal system in headers file.
//#include <sigc++/signal_system.h>
#include <sigc++/sigc++.h>
#include <sigc++/slot.h>
//#include <sigc++/functors/slot.h>
//#include <sigc++/object.h>
#include <sigc++/object_slot.h>
using namespace SigC;
using namespace std;

// Some procedures to connect to.
int foo1(int i)  
{    cout<<"f("<<i<<");"<<endl;
       return 1;}
int foo2(int i)  
{   cout<<"sig2::f("<<i<<");"<<endl; 
   return 1;}

void foo1v(int i)
{    cout<<"fv("<<i<<");"<<endl;}
void foo2v(int i)
{    cout<<"sig2::fv("<<i<<");"<<endl;}

// (3) Objects which are to be connected must be derived from SigC::Object.
struct A : public Object
{
//public:
   A()     {    }
   int foo(int i)  
   {   cout<<"A::f("<<i<<");"<<endl;   return 1;    }
    void foov(int i)
   {        cout<<"A::fv("<<i<<");"<<endl;    }
};

int main()
{
   A a;
   // (4) Signals can be declared anywhere, including as class members
   // Their size is about that of 2 pointers.
   // Signals contain their callback signature as template parameters.
   // The number following it is the number of parameters, and the
   // first argument is the return type.
   // 
   // So to declare a signal called like int foo(int) would be
   //    Signal1< int, int> foo;

   // Lets declare a few signals.
   Signal1<int,int> sig1;    // int sig1(int);
   Signal1<int,int> sig2;    // int sig2(int);

   // The return type is allowed to be void.
   Signal1<void,int> sig1v;  // void sig(int);
   Signal1<void,int> sig2v;  // void sig2(int);

   // (5) After the signals are declared you can establish
   // connections between them and functions and methods.
   cout << ">> Connect to signals "<< endl;

   // Connect to function foo.
   sig1.connect(slot(foo1));

   // Connect to method foo of object a.
   sig1.connect(slot(a,&A::foo)); //OJO DESCOMENTADA NO COMPILA !!!

   // Connect to signal 1 to signal 2.  Thus all things in signal2
   // are also called.
   //sig1.connect(sig2.slot()); DON'T WORK !!!

   // We can do the same for the void signals.
   sig1v.connect(slot(foo1v));
   //sig1v.connect(slot(a,&A::foov)); DON'T WORK !!!
   sig1v.connect(sig2v.slot());

   sig2.connect(slot(foo2));
   sig2v.connect(slot(foo2v));

   // (6) After connection the signals can be "emitted".
   // This calls all the callbacks stored within the signal.
   // (Emits are generally called reverse of the order connected,
   // however this is implementation specific.)
   cout << ">> Emit signals "<< endl;

   // Explicitly calling the emits.
   sig1.emit(1);
   //sig1v.emit(2);

   // Or alternatively they can be called as a function object
   // with operator()
   sig1(1);
   //sig1v(2);
   return 0;
}

Do you have some working example with compilation instructions?

In advance, thank you very much.

Murray Cumming wrote:
> On Thu, 2007-10-18 at 22:42 +0100, grassidonato2 tin it wrote:
>   
> > I tried to compile "simple example" in the tutorial using the pkgconfig 
> > command and the file provided for it. As under cygwin as under kubuntu, 
> > it gives me the same problem with compiling. Thoroughly the 
> > installation of the library(libsigc++2.0) has comen out without any 
> > problems, and also the tests has been all passed. How do I can make a 
> > simple compilation as for the hello_world example without using that 
> > big makefile as in the example directory?
> > Many Thanks.
> >     
>
> How are you trying to compile it, and what error are you seeing?
>
>