[boost] numeric_op patch (was Re: [MPL] Numeric metafunctions protocol/infrastructure)

28 Sep 2004

      I wrote:
...
template <typename Tag1, typename Tag2>
 struct NUMERIC_OP_IMPL
 {
   template <typename N1, typename N2>
   struct apply
   {
     BOOST_STATIC_CONSTANT(
       bool,
       cond =
         BOOST_MPL_AUX_NESTED_VALUE_WKND(int, Tag1)
BOOST_MPL_AUX_NESTED_VALUE_WKND(int, Tag2)
     );
     typedef typename
               eval_if_c<
                 cond,
                 identity<N1>,
                 apply_wrap1<
                   BOOST_MPL_AUX_NUMERIC_CAST<
                     Tag1,Tag2
                   >,
                   N1
                 >
               >::type
             n_1;
     typedef typename
               eval_if_c<
                 cond,
                 apply_wrap1<
                   BOOST_MPL_AUX_NUMERIC_CAST<
                     Tag1,Tag2
Should be Tag2,Tag1
...
>,
                   N2
                 >,
                 identity<N2>
               >::type
             n_2;
     typedef typename
               apply_wrap2<
                 NUMERIC_OP_IMPL<
                   typename n_1::tag,
                   typename n_2::tag
                 >,
                 n_1,
                 n_2
               >::type
             type;
   };
 };
Is <boost/mpl/aux_/numeric_op.hpp> the right file to
patch for this particular problem?  The header files
in the boost/mpl/aux_/preprocessed/gcc/ directory say
"DO NOT MODIFY".  Are they (the numeric ops)
pregenerated from this file?

If so, I've attached the diff to this message.

                              Cromwell Enage

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