Re: [Vxl-maintainers] MSVC 6 problem with vnl_matrix_fixed * vnl_matrix_fixed

[Amitha P. <pe...@cs...>]

"Wheeler, Fred (Research)" <wh...@cr...> writes:
> MSVC 6 has been having some trouble with VXL the past couple of days.  There is a problem with
> multiplying two vnl_matrix_fixed objects.  I've been poking at this, but do not know enough about the
> vnl regular/fixed magic to fix it.

Ian Scott recently (in the last few days) committed a change to vnl
that may fix the problem. It seems that VS 6 has trouble determining
template parameters and overloads for the built-in operator*.

A temporary solution would be to change the multiplication to be
E2.ref() * L.ref(). This has the same effect as the explicit
conversions you tried, but is much cheaper.

>   // multiplying by a vector compiles fine
> 
>   vnl_double_3 x;
>   E2 * x;

Hmm. Since this works, does
   static_cast<vnl_matrix_fixed<double,3,3>&>(E2) * 
          static_cast<vnl_matrix_fixed<double,3,3>&>(x);
work?

Amitha.