[Boost-users] Re: Another boost bind question

From: Surya Kiran Gullapalli (skg_at_[hidden])
Date: 2005-02-09 04:12:29

> Hi,
> Please find the attached file.
> Whats wrong with bind, I'm getting compilation errors .
> ===================
> temp_bind.cpp: In constructor `temp::temp()':
> temp_bind.cpp:30: error: no matching function for call to `if_then
> (const
> boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, boost::tuples::tuple<bool (temp::*const)(int) const, temp* const, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, std::basic_ostream<char, std::char_traits<char> >&)'
> ==================

Well,
I was able to fix the previous problem, but i'm running into another
problem similar to this.
I'm using the same bind call, but this time i'm getting error like this.

=========================
cxtreeview.cpp:55: error: call of overloaded `bind(bool
(CXTreeView::*&)(Gtk::TreeIter&), CXTreeView* const, const
boost::lambda::lambda_functor<boost::lambda::placeholder<1> >&)' is
ambiguous
/nfs/skglnx/home/skg/.packages/boost-1.32.0/include/boost-1_32/boost/lambda/detail/bind_functions.hpp:415: note: candidates are: const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, boost::lambda::detail::unspecified> >, typename boost::lambda::detail::bind_tuple_mapper<typename boost::lambda::detail::constify_non_funcs<T>::type, const Arg2, const Arg3, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&) [with Arg1 = bool (CXTreeView::*)(Gtk::TreeIter&), Arg2 = CXTreeView*, Arg3 = boost::lambda::lambda_functor<boost::lambda::placeholder<1> >]
/nfs/skglnx/home/skg/.packages/gnome-2.8/include/sigc++-2.0/sigc+
+/adaptors/bind.h:2104: note:
sigc::bind_functor<-0x000000001, T_functor, typename
sigc::unwrap_reference<T_type>::type, typename
sigc::unwrap_reference<T_bound1>::type, sigc::nil, sigc::nil, sigc::nil,
sigc::nil, sigc::nil> sigc::bind(const T_functor&, T_type1, T_type2)
[with T_type1 = CXTreeView*, T_type2 =
boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, T_functor
= bool (CXTreeView::*)(Gtk::TreeIter&)]
========================

I was not able to figure out how the const keyword is coming into
picture for the second argument of bind function.

Any help would be of great help.

Thanks,
Surya