Re: [boost] boot::mpl::list problem

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2004-07-06 03:52:36

zaufi writes:
> Hi all!

Hi Zaufi, 

> 
> I have a problem compiling the following simple program without defining 
> BOOST_MPL_NO_PREPROCESSED_HEADERS. Though  obviously there are
> preprocessed headers in boost/mpl/list/aux_/preprocessed/plain. The problem 
> seems to be in compiler-specific preprocessed header (for example 
> boost/mpl/aux_/preprocessed/gcc/list.hpp) where list is defined with 10 
> arguments regardless of BOOST_MPL_LIMIT_LIST_SIZE value.

In short, it's this way by design. As you have found out, 
BOOST_MPL_LIMIT_LIST_SIZE takes effect only if you disable preprocessed headers.

> 
> ---{boost_list.cc} ---------------------------------------------
> // #  define BOOST_MPL_NO_PREPROCESSED_HEADERS
> #  if !defined(BOOST_MPL_LIMIT_LIST_SIZE) || (BOOST_MPL_LIMIT_LIST_SIZE < 20)
> #    undef BOOST_MPL_LIMIT_LIST_SIZE
> #    define BOOST_MPL_LIMIT_LIST_SIZE 20
> #  endif
> #include <boost/mpl/list.hpp>
> typedef boost::mpl::list<
>     int, int, int, int, int
>   , int, int, int, int, int
>   , int, int, int, int, int
>   > my_list;
> int main()
> {
>     my_list l;
>     return 0;
> };
> ---------------------------------------{end of boost_list.cc}---
> 
> any suggestions??

Use numbered list forms, e.g.:

    #include <boost/mpl/list/list20.hpp>
    
    typedef boost::mpl::list15<
          int, int, int, int, int
        , int, int, int, int, int
        , int, int, int, int, int
        > my_list;
    
    int main()
    {
        my_list l;
        return 0;
    }

HTH,
--
Aleksey Gurtovoy
MetaCommunications Engineering