I am new to using lambda expressions and have come across a problem I can't seem to resolve - would appreciate any insight on this. The following code fails to compile with VC++ 2003: #include "stdafx.h" class IX { public: virtual double value() const = 0 ; } ; class X : public IX { public: explicit X(double value) : value_( value ) {} virtual double value() const { return value_ ; } private: X() { } double value_ ; } ; int _tmain(int argc, _TCHAR* argv[]) { using namespace boost ; using namespace boost::lambda ; using namespace std ; typedef boost::shared_ptr<IX> XPtr ; XPtr x3( new X( 99 ) ) ; XPtr x4( new X( 199 ) ) ; std::vector<XPtr> xptrs ; xptrs.push_back( x3 ) ; xptrs.push_back( x4 ) ; for_each( xptrs.begin(), xptrs.end(), std::cout << bind( &IX::value, _1 ) ) ; return 0; } I get the following compile-time error reported and i've looked at it and can't seem to locate the problem - if anyone could help me with this I would appreciate it, thanks. Adrian. COMPILATION ERROR--->>> u:\boost\1.32.0\include\boost\lambda\detail\actions.hpp(87) : error C2665: 'boost::lambda::function_adaptor<Func>::apply' : none of the 2 overloads can convert parameter 2 from type 'std::allocator<_Ty>::value_type' with [ Func=boost::lambda::return_type_N,boost::lambda::lambda_functor_base>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>>::sig>::rets_t>::plain_Func ] and [ _Ty=XPtr ] u:\boost\1.32.0\include\boost\lambda\detail\function_adaptors.hpp(179): could be 'Result boost::lambda::function_adaptor<Func>::apply<RET>(Result (__thiscall IX::* )(void) const,const Object *)' with [ Result=double, Func=boost::lambda::return_type_N,boost::lambda::lambda_functor_base>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>>::sig>::rets_t>::plain_Func , RET=boost::lambda::lambda_functor_base>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traits

::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>>::sig>::type, Object=IX ] u:\boost\1.32.0\include\boost\lambda\detail\function_adaptors.hpp(183): or 'Result boost::lambda::function_adaptor<Func>::apply<RET>(Result (__thiscall IX::* )(void) const,const Object &)' with [ Result=double, Func=boost::lambda::return_type_N,boost::lambda::lambda_functor_base>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>>::sig>::rets_t>::plain_Func , RET=boost::lambda::lambda_functor_base>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>>::sig>::type, Object=IX ] while trying to match the argument list '(const rt0 , std::allocator<_Ty>::value_type)' with [ _Ty=XPtr ] u:\boost\1.32.0\include\boost\lambda\detail\lambda_functor_base.hpp(408) : see reference to function template instantiation 'RET boost::lambda::function_action<I>::apply(A1 & ,A2 &)' being compiled with [ RET=boost::lambda::lambda_functor_base>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>>::sig>::type, I=2, U=const rt0, T=IX, A1=const rt0, A2=std::allocator<XPtr>::value_type ] u:\boost\1.32.0\include\boost\lambda\detail\select_functions.hpp(30) : see reference to function template instantiation 'RET boost::lambda::lambda_functor_base::call::sig<SigArgs>::type,A,B,C,Env>(A &,B &,C &,Env &) const' being compiled with [ RET=boost::lambda::lambda_functor_base>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>>::sig>::type, Act=boost::lambda::action<2,boost::lambda::function_action<2>>, Args=boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type: :type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>, SigArgs=boost::tuples::tuple, A=std::allocator<XPtr>::value_type, B=const boost::tuples::null_type, C=const boost::tuples::null_type, Env=const boost::tuples::null_type ] u:\boost\1.32.0\include\boost\lambda\detail\operator_lambda_func_base.hpp(212) : see reference to function template instantiation 'boost::lambda::lambda_functor_base::sig<SigArgs>::type boost::lambda::detail::select,A,B,C,Env>(const boost::lambda::lambda_functor<T> &,A &,B &,C &,Env &)' being compiled with [ Act=boost::lambda::action<2,boost::lambda::function_action<2>>, Args=boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>, SigArgs=boost:: tuples::tuple, A=std::allocator<XPtr>::value_type, B=const boost::tuples::null_type, C=const boost::tuples::null_type, Env=const boost::tuples::null_type, T=boost::lambda::lambda_functor_base>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type>> ] u:\boost\1.32.0\include\boost\lambda\detail\lambda_functors.hpp(148) : see reference to function template instantiation 'RET boost::lambda::lambda_functor_base::call::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_baseboost::lambda::leftshift_action,boost::tuples::tuplestd::ostream::type>::RET,boost::lambda::lambda_functor>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::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>>::sig>::type, Act=boost::lambda: :bitwise_actionboost::lambda::leftshift_action, Args=boost::tuples::tuplestd::ostream::type>::RET,boost::lambda::lambda_functor>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::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=std::allocator<XPtr>::value_type, B=const boost::tuples::null_type, C=const boost::tuples::null_type, Env=const boost::tuples::null_type ] c:\Program Files\msvs2003\Vc7\include\algorithm(21) : see reference to function template instantiation 'boost::lambda::lambda_functor_base::sig<SigArgs>::type boost::lambda::lambda_functor<T>::operator ()::value_type>(A &) const' being compile d with [ Act=boost::lambda::bitwise_actionboost::lambda::leftshift_action, Args=boost::tuples::tuplestd::ostream::type>::RET,boost::lambda::lambda_functor>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::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, T=boost::lambda::lambda_functor_baseboost::lambda::leftshift_action,boost::tuples::tuplestd::ostream::type>::RET,boost::lambda::lambda_functor>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::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>>, _Ty=XPtr, A=std::allocator<XPtr>::value_type ] c:\development\lambdaSpike\lambdaSpike.cpp(56) : see reference to function template instantiation '_Fn1 std::for_each::iterator,boost::lambda::lambda_functor<T>>(_InIt,_InIt,_Fn1)' being compiled with [ _Fn1=boost::lambda::lambda_functorboost::lambda::leftshift_action,boost::tuples::tuplestd::ostream::type>::RET,boost::lambda::lambda_functor>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_tr aitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::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>>>, _Ty=XPtr, T=boost::lambda::lambda_functor_baseboost::lambda::leftshift_action,boost::tuples::tuplestd::ostream::type>::RET,boost::lambda::lambda_functor>,boost::tuples::tuple::type,const boost::lambda::detail::bind_traits<const boost::lambda::placeholder1_type>::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::type,boost::lambda::detail::bind_traitsboost::tuples::null_type::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>>, _InIt=std::vector<XPtr>::iterator ]

Build Time 0:01 Build log was saved at "file://c:\development\lambdaSpike\Debug\BuildLog.htm" lambdaSpike - 1 error(s), 0 warning(s)