This is about the same function but has been changed to this definition: template < typename T > typename T::const_iterator first_pipe(T const& cont) { namespace l = boost::lambda; typedef esi::metafunc::dereference_type<typename T::value_type>::type value_type; return std::find_if(cont.begin(), cont.end(), (l::bind(&value_type::GetType, *(l::_1))) == DT_PIPE); } Reason being that the function would work ok with containers holding raw pointers but couldn't resolve for smart pointers like shared_ptr. This way works for both, but with shared_ptr I get the warning pasted at the end of this message. Gnu handles it fine even with -Wall and -pedantic. Is there a better way to do what I'm doing and get rid of the warning or do I just need to supress it? Thanks. 1>c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_return_type_traits.hpp(240) : warning C4181: qualifier applied to reference type; ignored 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_traits.hpp(45) : see reference to class template instantiation 'boost::lambda::detail::contentsof_type<A>' being compiled 1> with 1> [ 1> A=const boost::shared_ptr 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_traits.hpp(53) : see reference to class template instantiation 'boost::lambda::detail::IF_type_<T>' being compiled 1> with 1> [ 1> T=boost::lambda::detail::contentsof_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_return_type_traits.hpp(314) : see reference to class template instantiation 'boost::lambda::detail::IF_type' being compiled 1> with 1> [ 1> C=true, 1> T=boost::lambda::detail::contentsof_type>, 1> E=boost::lambda::detail::identity_mapping 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\return_type_traits.hpp(88) : see reference to class template instantiation 'boost::lambda::return_type_1' being compiled 1> with 1> [ 1> Act=boost::lambda::other_action, 1> A=const boost::shared_ptr & 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_lambda_func_base.hpp(79) : see reference to class template instantiation 'boost::lambda::return_type_1_prot' being compiled 1> with 1> [ 1> Act=boost::lambda::other_action, 1> A=const boost::shared_ptr & 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_lambda_func_base.hpp(248) : see reference to class template instantiation 'boost::lambda::detail::unary_rt' being compiled 1> with 1> [ 1> Action=boost::lambda::other_action, 1> Bound=boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>, 1> Open=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(191) : see reference to class template instantiation 'boost::lambda::lambda_functor_base::sig<SigArgs>' being compiled 1> with 1> [ 1> Act=boost::lambda::other_action, 1> Args=boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>, 1> SigArgs=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(197) : see reference to class template instantiation 'boost::lambda::detail::deduce_non_ref_argument_types_' being compiled 1> with 1> [ 1> Args=boost::tuples::cons,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::tuples::detail::map_tuple_to_cons::type>, 1> SigArgs=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(225) : see reference to class template instantiation 'boost::lambda::detail::deduce_non_ref_argument_types_' being compiled 1> with 1> [ 1> Args=boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>, 1> SigArgs=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(398) : see reference to class template instantiation 'boost::lambda::detail::deduce_non_ref_argument_types' being compiled 1> with 1> [ 1> Args=boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>, 1> SigArgs=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(164) : see reference to class template instantiation 'boost::lambda::lambda_functor_base::sig<SigArgs>' being compiled 1> with 1> [ 1> Act=boost::lambda::action<2,boost::lambda::function_action<2>>, 1> Args=boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>, 1> SigArgs=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(213) : see reference to class template instantiation 'boost::lambda::detail::deduce_argument_types_' being compiled 1> with 1> [ 1> Args=boost::tuples::tuple>,boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>>>,const DT_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,boost::tuples::null_type,boost::tuples::null_type>, 1> SigArgs=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_lambda_func_base.hpp(60) : see reference to class template instantiation 'boost::lambda::detail::deduce_argument_types' being compiled 1> with 1> [ 1> Args=boost::tuples::tuple>,boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>>>,const DT_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,boost::tuples::null_type,boost::tuples::null_type>, 1> SigArgs=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_lambda_func_base.hpp(222) : see reference to class template instantiation 'boost::lambda::detail::binary_rt' being compiled 1> with 1> [ 1> Action=boost::lambda::relational_action, 1> Bound=boost::tuples::tuple>,boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>>>,const DT_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,boost::tuples::null_type,boost::tuples::null_type>, 1> Open=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\program files\microsoft visual studio 8\vc\include\algorithm(87) : see reference to class template instantiation 'boost::lambda::lambda_functor_base::sig<SigArgs>' being compiled 1> with 1> [ 1> Act=boost::lambda::relational_action, 1> Args=boost::tuples::tuple>,boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>>>,const DT_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,boost::tuples::null_type,boost::tuples::null_type>, 1> SigArgs=boost::tuples::tuple &,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,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\program files\microsoft visual studio 8\vc\include\algorithm(96) : see reference to function template instantiation '_InIt std::_Find_if::_Const_iterator<_Secure_validation>,_Pr>(_InIt,_InIt,_Pr)' being compiled 1> with 1> [ 1> _InIt=std::list>::_Const_iterator<false>, 1> _Ty=boost::shared_ptr, 1> _Secure_validation=false, 1> _Pr=boost::lambda::lambda_functor,boost::tuples::tuple>,boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>>>,const DT_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,boost::tuples::null_type,boost::tuples::null_type>>> 1> ] 1> c:\documents and settings\nroberts\my documents\visual studio 2005\projects\playground\playground\playground.cpp(44) : see reference to function template instantiation '_InIt std::find_if::_Const_iterator<_Secure_validation>,boost::lambda::lambda_functor<T>>(_InIt,_InIt,_Pr)' being compiled 1> with 1> [ 1> _InIt=std::list>::_Const_iterator<true>, 1> _Ty=boost::shared_ptr, 1> _Secure_validation=true, 1> T=boost::lambda::lambda_functor_base,boost::tuples::tuple>,boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>>>,const DT_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,boost::tuples::null_type,boost::tuples::null_type>>, 1> _Pr=boost::lambda::lambda_functor,boost::tuples::tuple>,boost::tuples::tuple,boost::tuples::tuple>,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,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type,boost::lambda::detail::bind_traits::type>>>,const DT_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,boost::tuples::null_type,boost::tuples::null_type>>> 1> ] 1> c:\documents and settings\nroberts\my documents\visual studio 2005\projects\playground\playground\playground.cpp(65) : see reference to function template instantiation 'std::list<_Ty>::_Const_iterator<_Secure_validation> first_pipe(const T &)' being compiled 1> with 1> [ 1> _Ty=boost::shared_ptr, 1> _Secure_validation=true, 1> T=list1_t 1> ]