[Boost-users] [range_ex] range adaptor and boost::lambda

Subject: [Boost-users] [range_ex] range adaptor and boost::lambda
From: 041021042 (041021042_at_[hidden])
Date: 2009-04-09 22:50:52

Hi,

Thanks for solving my previous find() problem.

I found another problem of range_ex. The following code still works well with the old version of range_ex (Dec 2008), and cause a compile error with the newest version.

code:
#include <boost/range/adaptor/filtered.hpp>
#include <boost/range/algorithm.hpp>
#include <boost/lambda/lambda.hpp>
#include <boost/lambda/bind.hpp>
#include <boost/assign.hpp>
#include <iostream>
#include <vector>

bool is_even(int x) { return x % 2 == 0; }

int main()
{
    using namespace boost::assign;
    using namespace boost::adaptors;
    using namespace boost::lambda;

    std::vector<int> input;
    input += 1,2,3,4,5,6,7,8,9;

    boost::copy( input | filtered(bind(is_even, _1)),
        std::ostream_iterator<int>(std::cout, ",") );

    return 0;
}

compiler: msvc2008

error messages:
d:\software\boost_1_37_0\boost\lambda\detail\lambda_traits.hpp(389) : warning C4180: qualifier applied to function type has no meaning; ignored
        d:\software\boost_1_37_0\boost\lambda\detail\lambda_traits.hpp(458) : see reference to class template instantiation 'boost::lambda::detail::bind_traits<T>' being compiled
        with
        [
            T=bool (int)
        ]
        e:\zxg\boost\range_ex\range.cpp(20) : see reference to class template instantiation 'boost::lambda::detail::bind_tuple_mapper<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9>' being compiled
        with
        [
            T0=bool (int),
            T1=boost::lambda::placeholder1_type,
            T2=boost::tuples::null_type,
            T3=boost::tuples::null_type,
            T4=boost::tuples::null_type,
            T5=boost::tuples::null_type,
            T6=boost::tuples::null_type,
            T7=boost::tuples::null_type,
            T8=boost::tuples::null_type,
            T9=boost::tuples::null_type
        ]
d:\software\boost_1_37_0\boost\tuple\detail\tuple_basic.hpp(383) : error C3853: '=': re-initializing a reference or assignment through a reference-to-function is illegal
        d:\software\boost_1_37_0\boost\tuple\detail\tuple_basic.hpp(382) : while compiling class template member function 'boost::tuples::cons<HT,TT> &boost::tuples::cons<HT,TT>::operator =(const boost::tuples::cons<HT,TT> &)'
        with
        [
            HT=bool (__cdecl &)(int),
            TT=boost::tuples::cons<const boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::detail::map_tuple_to_cons<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::null_type>::type>
        ]
        d:\software\boost_1_37_0\boost\tuple\detail\tuple_basic.hpp(526) : see reference to class template instantiation 'boost::tuples::cons<HT,TT>' being compiled
        with
        [
            HT=bool (__cdecl &)(int),
            TT=boost::tuples::cons<const boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::detail::map_tuple_to_cons<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::null_type>::type>
        ]
        d:\software\boost_1_37_0\boost\lambda\detail\lambda_functor_base.hpp(398) : see reference to class template instantiation 'boost::tuples::tuple<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9>' being compiled
        with
        [
            T0=bool (__cdecl &)(int),
            T1=const boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,
            T2=boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,
            T3=boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,
            T4=boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,
            T5=boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,
            T6=boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,
            T7=boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,
            T8=boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,
            T9=boost::lambda::detail::bind_traits<boost::tuples::null_type>::type
        ]
        d:\software\boost_1_37_0\boost\lambda\detail\lambda_functors.hpp(113) : see reference to class template instantiation 'boost::lambda::lambda_functor_base<Act,Args>' being compiled
        with
        [
            Act=boost::lambda::action<2,boost::lambda::function_action<2,bool>>,
            Args=boost::tuples::tuple<bool (__cdecl &)(int),const boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples:
:null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>
        ]
        e:\zxg\boost\range_ex\range.cpp(20) : see reference to class template instantiation 'boost::lambda::lambda_functor<T>' being compiled
        with
        [
            T=boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2,bool>>,boost::tuples::tuple<bool (__cdecl &)(int),const boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detai
l::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>
        ]

Thanks,
Roger Zhou