[Boost-users] Errors when playing with lambda (1.32.0, VC7.1)

I'm taking a look at the Lambda library, and writing some toy programs, and I keep coming up with errors, and I can't figure out what the problems are.... Example 1: This works as expected: using namespace boost::lambda; class Foo { public: void print() { std::cout << "Foo::print()\n"; } }; template Function for_all(Container cont, Function f) { return std::for_each(cont.begin(), cont.end(), f); } int main(int argc, char* argv[]) { std::vector<Foo> vec; //Fill vec for_all(vec, (bind(&Foo::print, _1))); return 0; } If I change the declaration of for_all to take the container by const reference, I get errors [See Error 1 pasted in below]: using namespace boost::lambda; class Foo { public: void print() { std::cout << "Foo::print()\n"; } }; template Function for_all(Container const &cont, Function f) { return std::for_each(cont.begin(), cont.end(), f); } int main(int argc, char* argv[]) { std::vector<Foo> vec; //Fill vec for_all(vec, (bind(&Foo::print, _1))); return 0; } Example 2: It looks from the docs like I should be able to rewrite the bind expression above using operator ->*, like so: for_all(vec, (&_1 ->* &Foo::print)); And, in fact this compiles cleanly (regardless of whether the container is passed by value or by const reference). Foo::print() never gets called, though. What am I doing wrong or not understanding here? Thanks in advance!!! -------------------------------- John Wismar john.wismar@autozone.com ------------------------------------------------------------------------------------------------------------- [Error 1] c:\dev\alldata\Dev\3rd Party\boost\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 'const 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=Foo ] c:\dev\alldata\Dev\3rd Party\boost\boost\lambda\detail\function_adaptors.hpp(193): could be 'Result boost::lambda::function_adaptor<Func>::apply<RET>(Result (__thiscall Foo::* )(void),Object *)' with [ Result=void, 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,boo st::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=Foo ] c:\dev\alldata\Dev\3rd Party\boost\boost\lambda\detail\function_adaptors.hpp(197): or 'Result boost::lambda::function_adaptor<Func>::apply<RET>(Result (__thiscall Foo::* )(void),Object &)' with [ Result=void, 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,boo st::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=Foo ] while trying to match the argument list '(const rt0 , const std::allocator<_Ty>::value_type)' with [ _Ty=Foo ] c:\dev\alldata\Dev\3rd Party\boost\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, A1=const rt0, A2=const std::allocator<Foo>::value_type ] c:\dev\alldata\Dev\3rd Party\boost\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_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::typ e,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=const std::allocator<Foo>::value_type, B=const boost::tuples::null_type, C=const boost::tuples::null_type, Env=const boost::tuples::null_type ] c:\DevTools\VS.NET2003\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 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, 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_traits<b oost::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>>, _Ty=Foo, A=const std::allocator<Foo>::value_type ] c:\Temp\LambdaTest\LambdaTest.cpp(29) : see reference to function template instantiation '_Fn1 std::for_each::const_iterator,Function>(_InIt,_InIt,_Fn1)' being compiled with [ _Fn1=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>>>, _Ty=Foo, Function=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>>>, _InIt=std::vector<Foo>::const_iterator ] c:\Temp\LambdaTest\LambdaTest.cpp(35) : see reference to function template instantiation 'Function for_all,boost::lambda::lambda_functor<T>>(const Container &,Function)' being compiled with [ Function=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>>>, _Ty=Foo, 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>>, Container=std::vector<Foo> ]