New subject: [Boost-Users] MPL pop_back problem

16 May 2003

      I get some weird error messages which I don't really understand when I
tried using mpl::pop_back today. The following example (more or less an
exact copy of the one in the documentation):

------------------ start code -----------------

#include 
#include 

using namespace boost::mpl;

void f()
{
    typedef list::type ListType;
    typedef pop_back<ListType>::type PoppedList;
}

------------------ end code ----------------------

fails on gcc 3.2 (Boost 1.30) with:

pop_back.cpp: In instantiation of `boost::mpl::pop_back':
pop_back.cpp:9:   instantiated from here
pop_back.cpp:9: base class `

boost::mpl::pop_back_traitsboost::mpl::aux::list_tag::algorithm
   ' has incomplete type
pop_back.cpp: In function `void f()':
pop_back.cpp:9: ISO C++ forbids declaration of `type' with no type
pop_back.cpp:9: typedef name may not be class-qualified
pop_back.cpp:9: parse error before `;' token

I'd appreciate if someone could clear this up for me.

Regards,
--
Tarjei

MPL pop_back problem

Tarjei Knapstad

Tarjei Knapstad

David Abrahams

Tarjei Knapstad

David Abrahams

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