Re: [Boost-users] MPL - what rule am I breaking?

6 Mar 2009


      Noah Roberts wrote:
...
template < typename FIELD, bool Writable >
struct rec
<snip>
...
template < typename VEC >
struct generate_record
  : boost::mpl::inherit_linearly< VEC, boost::mpl::inherit< rec<pl::_2, 
true>, pl::_1> >::type
<snip>
The problem is the "bool Writable" non-type template parameter. The MPL 
lambda expression evaluator can't handle that. Change it to this:

   template<typename Field, typename Writable>
   struct rec

and then

   template < typename VEC >
   struct generate_record
     : boost::mpl::inherit_linearly< VEC, boost::mpl::inherit< 
rec<pl::_2, mpl::true_>, pl::_1> >::type

HTH,

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com