(no subject)

From: richielee616_at_[hidden]
Date: 2001-11-26 08:02:53

I define two signals, and I want connect one to the other:
  signal2<void, int, int> sig1,sig2;
  sig1.connect(sig2);

my compiler ( MSVC6.0 SP5 ) refuse to compile:
d:\cpplibs\include\boost\function\function_base.hpp(195) : error 
C2558: class 'boost::signal2<void,int,int,struct 
boost::return_last_value<void> >' : no copy constructor available
d:\cpplibs\include\boost\function\function_base.hpp(178) : while 
compiling class-template member function 'union 
boost::detail::function::any_pointer __cdecl 
boost::detail::function::functor_manager<class 
boost::signal2<void,int,int,struct boost::return_last_value<void> 
>,int>::manager(union boost::detail::function::any_pointer,enum 
boost::detail::function::functor_manager_operation_type,struct 
boost::detail::function::function_obj_tag)'

so I add an function slot_sig to do so:

void slot_sig( int x, int y, const signal2<void,int,int> &sig )
{
        sig( x, y );
}
  
  signal2<void, int, int> sig1,sig2;
  sig1.connect(bind(slot_sig,_1,_2,sig2));

there is still an error:
d:\projects\temp\boo_9.cpp(31) : error C2664: 'class 
boost::_bi::bind_t<void,void (__cdecl*)(int,int,class 
boost::signal2<void,int,int,struct boost::return_last_value<void> > 
&),class boost::_bi::list3<class boost::_bi::arg<1>,class 
boost::_bi::arg<2>,class boost::_bi::value<class 
boost::signal2<void,int,int,struct boost::return_last_value<void> > > 
> > __cdecl boost::bind(void (__cdecl *)(int,int,class 
boost::signal2<void,int,int,struct boost::return_last_value<void> > 
&),class boost::_bi::arg<1>,class boost::_bi::arg<2>,class 
boost::signal2<void,int,int,struct boost::return_last_value<void> 
>)' : cannot convert parameter 4 from 'class 
boost::signal2<void,int,int,struct boost::return_last_value<void> >' 
to 'class boost::signal2<void,int,int,struct 
boost::return_last_value<void> >'No copy constructor available for 
class 'boost::signal2<void,int,int,struct 
boost::return_last_value<void> >'

at last, I change the third parameter from type 'const 
signal2<void,int,int>&' to 'const siganl2<void,int,int> *'.

void slot_sig( int x, int y, const signal2<void,int,int> *sig )
{
        (*sig)( x, y );
}
  
  signal2<void, int, int> sig1,sig2;
  sig1.connect(bind(slot_sig,_1,_2,&sig2));

It passed at last!
My question is: Did I make mistakes? What is the right way to connect 
a signal to anther one?