[boost] [type_traits] attempt to patch floating_point_promotion on borland

From: Alexander Nasonov (alnsn_at_[hidden])
Date: 2007-06-04 02:57:02

I'm trying to fix floating_point_promotion. The template is very simple,
it transforms cv qualified float to cv qualified double but borland
doesn't understand cv specializations.

Since I don't remember how to workaround borland problems, I rely on MPL.
I wrote the following

template<class T>
struct floating_point_promotion
  : mpl::at<
        mpl::vector< T, double, double const, double volatile,
                     double const volatile >
      , mpl::plus<
            is_same<T, float>
          , mpl::multiplies< is_same<T, float const>         , mpl::int_<2> >
          , mpl::multiplies< is_same<T, float volatile>      , mpl::int_<3> >
          , mpl::multiplies< is_same<T, float const volatile>, mpl::int_<4> >
          >
      >
{
};

I don't know why, but borland 5.1.1 strips cv from float so float const
is promoted to double (without const). Can someone with access to borland
later than deprecated 5.1.1 check promote_basic_test.cpp ?
The patch is attached.
-- 
Alexander Nasonov
http://nasonov.blogspot.com
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