[Boost-users] signal type declaration problem

From: Emre Birol (ebirol_at_[hidden])
Date: 2006-04-06 14:23:29

Hi all,

I have a class like below and I want to declare a signal type inside my 
class. Unfortunately when I do that MS VC80 complaints. Any help highly 
will be appreciated.

     template <typename T>
     class MyTask
     {
     public:
         // type definitions
         typedef enum { waiting, running, completed, failed } States;
         typedef boost::signal<void (States)> StatusChanged;
         typedef boost::signals::connection  Connection;
     };

I get two warnings first then an error:

Warning	1	warning C4512: 'boost::signals::detail::bound_objects_visitor' 
: assignment operator could not be generated 
c:\lib\boost\include\boost-1_33\boost\signals\trackable.hpp	185	

Warning	2	warning C4346: 
'boost::signal<void(lumentest::NITask<trait>::States)>::slot_function_type' 
: dependent name is not a type 
c:\projects\tesla-at-sti\src\lumentest\devices\nitask.hpp	124	

Error	3	error C2061: syntax error : identifier 'slot_function_type' 
c:\projects\tesla-at-sti\src\lumentest\devices\nitask.hpp	124	

if I replace 'States' with an int type then it works. I think compiler
can't find out the type of States properly...

I've also tried following declarations. None of them worked.
    typedef boost::signal<void (MyTask::States)> StatusChanged;
    typedef boost::signal<void (MyTask<T>::States)> StatusChanged;
    typedef boost::signal<void (typename MyTask::States)> StatusChanged;

thanks,
Emre