[boost] [fusion]bug: as_list on cons list is identity

From: Larry Evans (cppljevans_at_[hidden])
Date: 2008-02-05 18:58:07

With source_type:

boost::fusion::cons
< type_id
   < 0u
   >
, boost::fusion::cons
   < type_id
     < 1u
     >
   , boost::fusion::cons
     < type_id
       < 2u
       >
     , boost::fusion::nil
     >
   >
 >

the result type of fusion::result_of::as_list<source_type>::type
is:

   boost::fusion::cons
   < type_id
     < 0u
     >
   , boost::fusion::cons
     < type_id
       < 1u
       >
     , boost::fusion::cons
       < type_id
         < 2u
         >
       , boost::fusion::nil
       >
     >
   >

However, I expected something more like was happens with:

   fusion::result_of::as_vector<source_type>::type

which gives the result type:

   boost::fusion::vector
   < type_id
     < 0u
     >
   , type_id
     < 1u
     >
   , type_id
     < 2u
     >
   , boost::fusion::void_
   , boost::fusion::void_
   , boost::fusion::void_
   , boost::fusion::void_
   , boost::fusion::void_
   , boost::fusion::void_
   , boost::fusion::void_
   >

IOW, instead of:

   boost::fusion::vector<...>

there should be:

   boost::fusion::list<...>

as the 1st line of the above result type for as_list<source_type>::type.