Hi people, That's the first time I'm using lambda and I'm stuck with something that can be resumed to: struct A { int Test() { return 0; } }; int x; A a; (var(x)=bind(&A::Test,_1))(a); In other words, I want to make a functor that calls a member function and stores its return value in some variable. I'm compiling with VC7.1 and it returns error C2440: '=' : cannot convert from 'const boost::tuples::cons<HT,TT>::stored_head_type' to 'int' Is there something I can do to get rid of this error and compile successfully? I'm appending the whole compiler output in the end of the post. Thanks, rod //--------- Whole compiler output c:\RodSoft\lib\boost\boost\lambda\detail\operator_lambda_func_base.hpp(242) : error C2440: '=' : cannot convert from 'const boost::tuples::cons<HT,TT>::stored_head_type' to 'int' with [ HT=const boost::lambda::detail::parameter_traits_<const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>,const boost::lambda::detail::IF<false,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>> &,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>>::RET>::type, TT=boost::tuples::detail::map_tuple_to_cons<boost::tuples::null_type,boost:: tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::t uples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tu ples::null_type,boost::tuples::null_type,boost::tuples::null_type>::type ] No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called c:\RodSoft\lib\boost\boost\lambda\detail\lambda_functors.hpp(153) : see reference to function template instantiation 'RET boost::lambda::lambda_functor_base<Act,Args>::call<boost::lambda::lambda_fun ctor_base<Act,Args>::sig<SigArgs>::type,A,const boost::tuples::null_type,const boost::tuples::null_type,const boost::tuples::null_type>(A &,B &,C &,Env &) const' being compiled with [ RET=boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::la mbda::assignment_action>,boost::tuples::tuple<boost::lambda::lambda_functor< boost::lambda::identity<int &>>,const boost::lambda::detail::parameter_traits_<const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>,const boost::lambda::detail::IF<false,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>> &,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>>::RET>::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::t uples::null_type>>::sig<boost::tuples::tuple<A &,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>> ::type, Act=boost::lambda::other_action<boost::lambda::assignment_action>, Args=boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::ident ity<int &>>,const boost::lambda::detail::parameter_traits_<const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>,const boost::lambda::detail::IF<false,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>> &,const boost::_bi::bind_t<int,boost::_mfi::mf 0<int,A>,boost::_bi::list1<boost::_bi::list_av_1<boost::arg<1>>::B1>>>::RET> ::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>, SigArgs=boost::tuples::tuple<A &,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>, A=A, B=const boost::tuples::null_type, C=const boost::tuples::null_type, Env=const boost::tuples::null_type ] c:\RodSoft\pessoal\TstConsole\TstConsole.cpp(49) : see reference to function template instantiation 'boost::lambda::lambda_functor_base<Act,Args>::sig<SigArgs>::type boost::lambda::lambda_functor<T>::operator ()<A>(A &) const' being compiled with [ Act=boost::lambda::other_action<boost::lambda::assignment_action>, Args=boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::ident ity<int &>>,const boost::lambda::detail::parameter_traits_<const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>,const boost::lambda::detail::IF<false,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>> &,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>>::RET>::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::t uples::null_type>, SigArgs=boost::tuples::tuple<A &,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>, T=boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lamb da::assignment_action>,boost::tuples::tuple<boost::lambda::lambda_functor<bo ost::lambda::identity<int &>>,const boost::lambda::detail::parameter_traits_<const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>,const boost::lambda::detail::IF<false,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>> &,const boost::_bi::bind_t<int,boost::_mfi::mf0<int,A>,boost::_bi::list1<boost::_bi: :list_av_1<boost::arg<1>>::B1>>>::RET>::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_t ype>>, A=A ] Build log was saved at "file://c:\RodSoft\pessoal\TstConsole\Debug\BuildLog.htm" TstConsole - 1 error(s), 0 warning(s)