[Boost-users] [Signals] Connecting to signals with bind and member functions

From: Grant Patterson (grantp_at_[hidden])
Date: 2008-04-25 19:58:16

Hi Folks,

I'm just getting started with Boost signals (actually moving from sigc++ 
signals) and I'm having trouble with something that seems rather simple:

#include <boost/bind.hpp>
#include <boost/signals/slot.hpp>

#include "dlg.hh" // includes <boost/signal.hpp>

Dlg::Dlg()
{
    boost::signal<void()> login;
    login.connect(boost::bind(&Dlg::Foo, this));
}

void
Dlg::Foo()
{
    // stuff
}

In fact, I've found an example in LyX's source http://tinyurl.com/68secc that 
seems to do exactly what I'm doing. I get:

.../boost-1.33.1/include/boost-1_33_1/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 = Dlg*]':
.../boost-1.33.1/include/boost-1_33_1/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<Dlg*>]'
.../boost-1.33.1/include/boost-1_33_1/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, Dlg>, L = boost::_bi::list1<boost::_bi::value<Dlg*> >]'
.../boost-1.33.1/include/boost-1_33_1/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, Dlg>, L = boost::_bi::list1<boost::_bi::value<Dlg*> >]'
.../boost-1.33.1/include/boost-1_33_1/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, Dlg>, boost::_bi::list1<boost::_bi::value<Dlg*> > >]'
.../boost-1.33.1/include/boost-1_33_1/boost/signals/slot.hpp:121:   instantiated 
from 'boost::slot<SlotFunction>::slot(const F&) [with F = 
boost::_bi::bind_t<void, boost::_mfi::mf0<void, Dlg>, 
boost::_bi::list1<boost::_bi::value<Dlg*> > >, SlotFunction = 
boost::function<void ()(), std::allocator<void> >]'
.../source_tree/dlg.cc:92:   instantiated from here
.../boost-1.33.1/include/boost-1_33_1/boost/bind.hpp:1208: error: no matching 
function for call to 'visit_each(boost::signals::detail::bound_objects_visitor&, 
Dlg* const&, int)'

Any idea what might be causing this? Thanks!

grant