Mac Forum / Programming / CodeWarrior / January 2004

Hi All,

I am trying to use boost::signals in my application, and I've run into a
problem.

I try to connect to a signal using a pointer-to-member function set up
with boost::bind.  The code (greatly simplified for posting) is similar
to this:

extern boost::signal1<void, class ModelItem*> sig;

class BrowserItem
{
  BrowserItem::BrowserItem()
  {
    sig.connect(boost::bind(&BrowserItem::MyHandleSig, this, _1));
  }

  void MyHandleSig(class ModelItem*);
};

The call to connect generates the error message below.  There appears to
be some kind of mismatch in the data types used by some deeply nested
template instantiations.  But I'm a bit stumped as to the exact cause,
much less a solution.

Any ideas?

BTW, this is using CW 8.3 on 10.3.2, in a Mach-O project using the BSD
headers.

-------------------------------------------------------------------------

Error   : function call 'visit_each({lval}
boost::signals::detail::bound_objects_visitor, {lval} BrowserItem *const
, int)' does not match
'boost::visit_each<...>(__T0 &, const boost::_bi::value<__T1> &, int)'
 (point of instantiation: 'BrowserItem::BrowserItem(ModelItem *,
B::OSPtr<OpaqueMenuRef *>)')
  (instantiating: 'boost::slot<boost::function1<void, ModelItem *,
std::allocator<boost::function_base>>>::slot<boost::_bi::bind_t<void,
boost::_mfi::mf1<void, BrowserItem, ModelItem *>,
boost::_bi::list2<boost::_bi::value<BrowserItem *>,
boost::arg<1>>>>(const boost::_bi::bind_t<void, boost::_mfi::mf1<void,
BrowserItem, ModelItem *>,
boost::_bi::list2<boost::_bi::value<BrowserItem *>, boost::arg<1>>> &)')
   (instantiating:
'boost::visit_each<boost::signals::detail::bound_objects_visitor,
boost::_bi::bind_t<void, boost::_mfi::mf1<void, BrowserItem, ModelItem
*>, boost::_bi::list2<boost::_bi::value<BrowserItem *>,
boost::arg<1>>>>(boost::signals::detail::bound_objects_visitor &, const
boost::_bi::bind_t<void, boost::_mfi::mf1<void, BrowserItem, ModelItem
*>, boost::_bi::list2<boost::_bi::value<BrowserItem *>, boost::arg<1>>> &)')
    (instantiating:
'boost::visit_each<boost::signals::detail::bound_objects_visitor, void,
boost::_mfi::mf1<void, BrowserItem, ModelItem *>,
boost::_bi::list2<boost::_bi::value<BrowserItem *>,
boost::arg<1>>>(boost::signals::detail::bound_objects_visitor &, const
boost::_bi::bind_t<void, boost::_mfi::mf1<void, BrowserItem, ModelItem
*>, boost::_bi::list2<boost::_bi::value<BrowserItem *>, boost::arg<1>>>
&, int)')
     (instantiating: 'boost::_bi::bind_t<void, boost::_mfi::mf1<void,
BrowserItem, ModelItem *>,
boost::_bi::list2<boost::_bi::value<BrowserItem *>,
boost::arg<1>>>::accept<boost::signals::detail::bound_objects_visitor>(boost::signals::detail::bound_objects_visitor
&) const')
      (instantiating: 'boost::_bi::list2<boost::_bi::value<BrowserItem
*>,
boost::arg<1>>::accept<boost::signals::detail::bound_objects_visitor>(boost::signals::detail::bound_objects_visitor
&) const')
       (instantiating:
'boost::visit_each<boost::signals::detail::bound_objects_visitor,
BrowserItem *>(boost::signals::detail::bound_objects_visitor &, const
boost::_bi::value<BrowserItem *> &, int)')
BrowserItem.cp line 1750   }