[Boost-users] boost signals, boost bind, visit_each + gcc 4.1 = broken ?

From: Koen Deforche (koen.deforche_at_[hidden])
Date: 2007-01-06 12:02:02

All,

I encountered a problem using boost signals, with gcc 4.1.1 although
all is fine using gcc 3.4.4. I am using boost 1.33.1.

I get an error which terminates with:

/usr/include/boost/bind.hpp: In function 'void boost::visit_each(V&,
const boost::_bi::value<T>&, int) [with V =
boost::signals::detail::bound_objects_visitor, T = AlignmentWidget*]':
/usr/include/boost/bind.hpp:239:   instantiated from 'void
boost::_bi::list1<A1>::accept(V&) const [with V =
boost::signals::detail::bound_objects_visitor, A1 =
boost::_bi::value<AlignmentWidget*>]'
/usr/include/boost/bind/bind_template.hpp:150:   instantiated from
'void boost::_bi::bind_t<R, F, L>::accept(V&) const [with V =
boost::signals::detail::bound_objects_visitor, R = void, F =
boost::_mfi::mf0<void, AlignmentWidget>, L =
boost::_bi::list1<boost::_bi::value<AlignmentWidget*> >]'
/usr/include/boost/bind.hpp:1213:   instantiated from 'void
boost::visit_each(V&, const boost::_bi::bind_t<R, F, L>&, int) [with V
= boost::signals::detail::bound_objects_visitor, R = void, F =
boost::_mfi::mf0<void, AlignmentWidget>, L =
boost::_bi::list1<boost::_bi::value<AlignmentWidget*> >]'
/usr/include/boost/visit_each.hpp:25:   instantiated from 'void
boost::visit_each(Visitor&, const T&) [with Visitor =
boost::signals::detail::bound_objects_visitor, T =
boost::_bi::bind_t<void, boost::_mfi::mf0<void, AlignmentWidget>,
boost::_bi::list1<boost::_bi::value<AlignmentWidget*> > >]'
/usr/include/boost/signals/slot.hpp:121:   instantiated from
'boost::slot<SlotFunction>::slot(const F&) [with F =
boost::_bi::bind_t<void, boost::_mfi::mf0<void, AlignmentWidget>,
boost::_bi::list1<boost::_bi::value<AlignmentWidget*> > >,
SlotFunction = boost::function0<void,
std::allocator<boost::function_base> >]'
/usr/local/include/WSignal:603:   instantiated from
'boost::signals::connection Wt::EventSignal<void>::connect(T*, void
(T::*)()) [with T = AlignmentWidget]'
/home/kdforc0/project/c++/sequencetool/src/web/AlignmentWidget.C:59:
instantiated from here
/usr/include/boost/bind.hpp:1208: error: no matching function for call
to 'visit_each(boost::signals::detail::bound_objects_visitor&,
AlignmentWidget* const&, int)'

Since AlignmentWidget inherits indirectly from
boost::signals::trackable, this specialisation
should really exist ?

Is this is a bug in gcc 4.1.1 or with boost ?
Is there a workaround for making it work with gcc 4.1.1 ?

Regards,
koen