[Bug c++/17501] Failing to compile code using boost bind/signal

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-09-16 14:08 -------
I probably need some help from people knowing boost::signals better than me: 
 
There are three overloads of the get_inspectable_slot function: 
    template<typename F> 
    const F& 
    get_inspectable_slot(const F& f, signals::detail::signal_tag); 
 
    template<typename F> 
    const F& 
    get_inspectable_slot(const reference_wrapper<F>& f, 
                         signals::detail::reference_tag); 
 
    template<typename F> 
    const F& 
    get_inspectable_slot(const F& f, signals::detail::value_tag); 
 
The call that fails looks like this: 
   signals::get_inspectable_slot(f, signals::tag_type(f)); 
where signals::tag_type(f) returns an object of type 
   boost::signals::detail::reference_tag 
With that, it is clear that no overload matches. 
 
HOWEVER: with a gcc 3.4, signals::tag_type(f) returns an object of 
type 
  boost::signals::detail::value_tag 
for which we have a matching overload. I should try next to figure out 
why this is so. 
 
W. 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17501