When using 2 versions of sigc in different namespaces (for personal reasons) ADL
causes an ambiguity when mem_fun calls visit_each. Item 1 shows the compiler
error. Item 2 is a patch solving the problem

Item 1: 

test.C:208:   instantiated from here
/opt/app/gnome-2.4/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:267:
error: call
   of overloaded `visit_each(const
   sigc::internal::limit_derived_target<sigc::trackable*,
   sigc::internal::slot_do_bind>&, sigc::pointer_functor3<MyMetaClient*,
   MetaContract*, meta_updated_flag, void>&)' is ambiguous
/opt/app/gnome-2.4/include/sigc++-2.0/sigc++/visit_each.h:113: error: candidates
   are: void sigc::visit_each(const T_action&, const T_functor&) [with T_action
   = sigc::internal::limit_derived_target<sigc::trackable*,
   sigc::internal::slot_do_bind>, T_functor =
   sigc::pointer_functor3<MyMetaClient*, MetaContract*, meta_updated_flag,
   void>]
/home/lex/SANDBOX2/install/include/toast/0.2/toast/signals/visit_each.H:113: error:
                  void toast::signals::visit_each(const T_action&, const
   T_functor&) [with T_action =
   sigc::internal::limit_derived_target<sigc::trackable*,
   sigc::internal::slot_do_bind>, T_functor =
   sigc::pointer_functor3<MyMetaClient*, MetaContract*, meta_updated_flag,
   void>]
gmake: *** [test.o] Error 1
gmake: *** Waiting for unfinished jobs....


Item 2: 

*** adaptor_trait.h.orig	2005-01-25 13:50:12.928361000 -0600
--- adaptor_trait.h	2005-01-25 13:50:54.599570000 -0600
***************
*** 264,270 ****
  void visit_each(const T_action& _A_action,
                  const adaptor_functor<T_functor>& _A_target)
  {
!   visit_each(_A_action, _A_target.functor_);
  }
  
  
--- 264,270 ----
  void visit_each(const T_action& _A_action,
                  const adaptor_functor<T_functor>& _A_target)
  {
!     sigc::visit_each(_A_action, _A_target.functor_);
  }