[sigc] type conversion errors during compilation

[Konstantin L Kouptsov <klk206 panix com>]

When compiling the library and the test_signal test, I got the following 
errors. Reading the report from bottom to top, I can see that bar(), 
defined as int bar(float i) in test_signal.cc, instantiates 
functor<float,int>, but information about the first parameter, float, or 
the arg type of bar(), is not conveyed correctly to operator() in 
adaptor_trait.h. I have inserted the relevant code from h files as /* */ 
comments below.

(I am on VS 2005)


... sending to list because I could not find where to report the bug.

--
Konstantin

================================

Compiling...
test_signal.cc
d:\vcprojects\libsigc++\sigc++\adaptors\adaptor_trait.h(82) : warning 
C4244: 'argument' : conversion from 'const int' to 'const float', 
possible loss of data

/*
  typename deduce_result_type<T_arg1>::type
  operator()(T_arg1 _A_arg1) const
    { return functor_(_A_arg1); }
*/


        d:\vcprojects\libsigc++\sigc++\functors\slot.h(137) : see 
reference to function template instantiation 'int 
sigc::adaptor_functor<T_functor>::operator ()<const int&>(T_arg1) const' 
being compiled
        with
        [
            T_functor=sigc::pointer_functor1<float,int>,
            T_arg1=const int &
        ]
        d:\vcprojects\libsigc++\sigc++\functors\slot.h(133) : while 
compiling class template member function 'int 
sigc::internal::slot_call1<T_functor,T_return,T_arg1>::call_it(sigc::internal::slot_rep 
*,const int &)'
        with
        [
            T_functor=sigc::pointer_functor1<float,int>,
            T_return=int,
            T_arg1=int
        ]
		
/*
		  static T_return call_it(slot_rep* rep, typename 
type_trait<T_arg1>::take a_1)
    {
      typedef typed_slot_rep<T_functor> typed_slot;
      typed_slot *typed_rep = static_cast<typed_slot*>(rep);
      return 
(typed_rep->functor_).SIGC_WORKAROUND_OPERATOR_PARENTHESES<typename 
type_trait<T_arg1>::take>
               (a_1);
    }

		
*/
		
        d:\vcprojects\libsigc++\sigc++\functors\slot.h(529) : see 
reference to class template instantiation 
'sigc::internal::slot_call1<T_functor,T_return,T_arg1>' being compiled
        with
        [
            T_functor=sigc::pointer_functor1<float,int>,
            T_return=int,
            T_arg1=int
        ]
		
/*
		  template <class T_functor>
		slot1(const T_functor& _A_func) : slot_base(new 
internal::typed_slot_rep<T_functor>(_A_func))
    {
      //The slot_base:: is necessary to stop the HP-UX aCC compiler 
from being confused. murrayc.
      slot_base::rep_->call_ = internal::slot_call1<T_functor, 
T_return, T_arg1>::address();
    }

*/
		
        d:\vcprojects\libsigc++\sigc++\functors\slot.h(1156) : see 
reference to function template instantiation 
'sigc::slot1<T_return,T_arg1>::slot1<T_functor>(const T_functor &)' 
being compiled
        with
        [
            T_return=int,
            T_arg1=int,
            T_functor=sigc::pointer_functor1<float,int>
        ]
		
/*
		  template <class T_functor> slot(const T_functor& _A_func) : 
parent_type(_A_func) {}
*/
		
		
        d:\vcprojects\libsigc++\tests\test_signal.cc(39) : see 
reference to function template instantiation 
'sigc::slot<T_return,T_arg1>::slot<sigc::pointer_functor1<float,T_return>>(const 
T_functor &)' being compiled
        with
        [
            T_return=int,
            T_arg1=int,
            T_functor=sigc::pointer_functor1<float,int>
        ]

/*
		    sig.connect(sigc::ptr_fun1(&bar));
*/

=====================================


Similat errors when compiling test_compatiblity:

=====================================

Compiling...
test_compatibility.cc
d:\vcprojects\libsigc++\sigc++\functors\slot.h(103) : warning C4244: 
'return' : conversion from 'double' to 'float', possible loss of data
        d:\vcprojects\libsigc++\sigc++\functors\slot.h(100) : while 
compiling class template member function 'float 
sigc::internal::slot_call0<T_functor,T_return>::call_it(sigc::internal::slot_rep 
*)'
        with
        [
            T_functor=sigc::bind_return_functor<double,SigC::Slot0<void>>,
            T_return=float
        ]
        d:\vcprojects\libsigc++\sigc++\functors\slot.h(454) : see 
reference to class template instantiation 
'sigc::internal::slot_call0<T_functor,T_return>' being compiled
        with
        [
            T_functor=sigc::bind_return_functor<double,SigC::Slot0<void>>,
            T_return=float
        ]
        d:\vcprojects\libsigc++\sigc++\functors\slot.h(1129) : see 
reference to function template instantiation 
'sigc::slot0<T_return>::slot0<T_functor>(const T_functor &)' being compiled
        with
        [
            T_return=float,
            T_functor=sigc::bind_return_functor<double,SigC::Slot0<void>>
        ]
        d:\vcprojects\libsigc++\tests\test_compatibility.cc(94) : see 
reference to function template instantiation 
'sigc::slot<T_return>::slot<sigc::bind_return_functor<double,T_functor>>(const 
sigc::bind_return_functor<double,T_functor> &)' being compiled
        with
        [
            T_return=float,
            T_functor=SigC::Slot0<void>
        ]

=================================