[Boost-users] [fusion] push_back / pop_back

Subject: [Boost-users] [fusion] push_back / pop_back
From: Daniel Bradburn (moagstar_at_[hidden])
Date: 2011-10-25 04:16:34

Hi,

I am trying to do the following:

#include <string>#include <boost/fusion/tuple.hpp>#include
<boost/fusion/include/push_back.hpp>#include
<boost/fusion/include/pop_back.hpp>
 int main(int argc, char* argv[])
{
    typedef boost::fusion::tuple<int> T1;
    typedef boost::fusion::result_of::push_back<const T1, std::string>::type T2;

    T1 a(0);
    T2 b(boost::fusion::push_back(a, std::string("")));

    boost::fusion::get<0>();

    T1 c(boost::fusion::pop_back(b));

    return 0;

}

However I get the following compilation errors:

error C4430:
  missing type specifier - int assumed. Note: C++ does not support default-int

  error C2868:
  'boost::lazy_disable_if_c<B,T>::type' : illegal syntax for
  using-declaration; expected qualified-name

error C2602:
  'boost::lazy_disable_if_c<B,T>::type' is not a member of a base class
  of 'boost::lazy_disable_if_c<B,T>'

error C2504:
  'boost::fusion::extension::at_impl<Tag>::apply<Sequence,N>' :
  base class undefined

  error C2504:
  'boost::fusion::extension::at_impl<Tag>::apply<Sequence,N>' :
  base class undefined

error C2146: syntax error : missing ';'
  before identifier 'type'

error C2039: 'type' : is not a member of
  'boost::fusion::result_of::at_c<Sequence,N>'

error C2664:
  'boost::fusion::tuple<T0>::tuple(const boost::fusion::tuple<T0>
  &)' : cannot convert parameter 1 from 'boost::fusion::iterator_range' to
  'const boost::fusion::tuple<T0> &'

error C2146: syntax error : missing ','
  before identifier 'type'

error C2065: 'type' : undeclared
  identifier

  error C2039: 'type' : is not a member of
  'boost::fusion::result_of::prior<Iterator>'

Having read the topic here :
http://lists.boost.org/Archives/boost/2011/08/184624.php it looks like
this is partly due to a bug in the pop_back implementation. Is there a
fix for this?

However I would like to know if it is also possible to use
boost::fusion::get on the result of push_back?

Best regards

Daniel Bradburn